GB 50292-1999 Civil building reliability evaluation standard

This standard applies to the inspection and appraisal of civil buildings in the following situations. GB 50292-1999 Civil Building Reliability Appraisal Standard GB50292-1999 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Standard for appraiser of reliability of civil buildings
Standard for appraiser of reliability of civil buildingsGB50292—1999
Editor: Sichuan Provincial Construction Committee
Approval department: Ministry of Construction of the People's Republic of China Effective date: October 1, 1999
6—15—1
Notice on the promulgation of the national standard "Standard for appraiser of reliability of civil buildings"
Relevant departments of the State Council, Construction Committees (Construction Departments) of provinces, autonomous regions and municipalities directly under the Central Government, relevant Planning Committees, Construction Committees of independently planned cities, and Xinjiang Production and Construction Corps:
According to the "1988 Plan for the Formulation and Revision of Engineering Construction Standards and Specifications" (Jizong [1987] 2390 of the State Planning Commission) According to the requirements of the Document No. 2390 of the State Planning Commission [1987], the "Civil Building Reliability Appraisal Standard" GB50292-1999, jointly formulated by the Sichuan Provincial Construction Committee and relevant departments, has been reviewed by relevant departments and approved as a mandatory national standard, numbered GB50292-1999. According to the requirements of the Document No. 2390 of the State Planning Commission [1987], the Sichuan Provincial Construction Committee is the main editor, and the Sichuan Provincial Academy of Building Science and relevant units jointly compiled the "Civil Building Reliability Appraisal Standard" GB50292-1999, which has been approved by the Ministry of Construction on June 10, 1999 with the Document No. 150 of Construction Standard [1999], and jointly issued with the State Administration of Quality and Technical Supervision. In the process of formulating this standard, a number of special studies were carried out, and the practical experience of civil building reliability appraisal in recent years was investigated and summarized. Through verification tests and trial appraisals, domestic and foreign scientific research results were adopted. On this basis, the provisions of this standard were proposed to widely solicit opinions from relevant quality inspection, scientific research, design, teaching and other units and safety appraisal management departments. After repeated revisions and enrichment, it was reviewed and finalized by the Standard and Quota Department of the Ministry of Construction and the Sichuan Provincial Construction Committee together with relevant departments. This standard is divided into 11 chapters and 5 appendices. Its main technical contents include: basic provisions, component safety and normal usability appraisal rating, sub-unit safety and normal usability appraisal rating, appraisal unit safety and normal usability rating, etc.
6—15-2
Effective from October 1, 1999:
This standard is managed by the Sichuan Provincial Construction Committee, the Sichuan Provincial Academy of Building Science is responsible for the specific interpretation work, and the Standard and Quota Research Institute of the Ministry of Construction organizes China Construction Industry Press to publish and distribute it. Ministry of Construction of the People's Republic of China
June 10, 1999
The Sichuan Provincial Academy of Building Science is responsible for the specific interpretation of this standard. When using this standard, any unit or individual, if you find any difficult problems or comments, please inform us at any time: Sichuan Provincial Academy of Building Science (zip code: 610081; address: No. 55, North Section 3, Huanlu Road, Chengdu). The list of the editor-in-chief, participating units and main drafters of this standard is as follows:
Editor-in-chief: Sichuan Provincial Academy of Building Science Participating units: Taiyuan University of Technology
Central South Architectural Design Institute
China Southwest Architecture Design Institute
Shaanxi Provincial Academy of Building Science
Fuzhou University
China Academy of Building Science
Southwest Jiaotong University
Main drafters: Liang Wang Yongwei
Huang Jingshan Ni Shizhu
Mou Zaiming Chen Xue Ting Xu Zhengxie Guo Qikun
Lei Bo Zhuo Shang Mu Ji Zhicang Huang Tang
2 Terms and symbols
Terms·
Symbols·
3 Basic provisions
Identification classification
Identification procedures and work content
Identification rating standards
4 Component safety identification and rating
General provisions
Concrete structure components
Steel structure components
Masonry structure components
This structural component．
Component normal usability appraisal rating
General provisions
Concrete structural components
Steel structural components
Masonry structural components
Wooden structural components
++.........
-15—4
6—15—4
6—15--4
6--15-4
-15—4
15---4
6—15—5
6—15—7
: 6—15—7
--15—7
-15—8
6--15--9
6--15-9
... 6-15—10
6—-15—10
6--15—10
6—15—11
6—15--11
........... 615-11
Subunit safety assessment rating
. 6—1512
General provisions
Foundation
. 6—15--12
. 6—15-12
6.3 Upper load-bearing structure
Load-bearing part of enclosure system
6--15-13
6--15—14
Subunit normal usability assessment rating
..... 6--1514
General provisions
Foundation
Upper load-bearing structure
Enclosure system
Identification unit safety and usability
Identification unit safety rating
-15—14
-15—15
6—15--15
6--15—16
-15-16
.... 6—15-16
Identification unit usability rating． …． ·—15--16 Civil building reliability rating
.... 6—15--16
..61.--16.
Civil building serviceability assessment:
Requirements for writing appraisal reports
Preliminary survey form for civil buildings.
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Determination of standard load values ​​on existing structures
Determination of standard values ​​of material strength of existing structural components
Division of individual components
Explanation of terms used in this standard
. 6—15--17
- 6-15-17
6—15—17
. 6—15--18
6—15-18
6—15-19
6—15—-3
1.0.1 This standard is formulated to correctly identify the reliability of civil buildings and strengthen the technical management of the safety and rational use of existing buildings. 1.0.2 This standard applies to the inspection and identification of civil buildings in the following situations. Safety identification of buildings (including identification of dangerous buildings and other emergency identification). Identification of building usage functions and daily maintenance inspection. 2
Special identification before the change of use, change of use conditions or renovation of buildings. Reliability identification of civil buildings in earthquake zones, special foundation soil areas or special environments shall comply with the provisions of relevant current national standards in addition to implementing this standard. Terms and symbols
Existing building
Existing building
Buildings that have been built for more than two years and have been put into use, existing structure
Existing structure
The general term for the load-bearing structure and related parts of an existing building. Repair-suitability of structure2.1.3 Structural repairability
The general term for the technical feasibility and economic rationality of the repair measures that should be taken for damaged or insufficiently loaded structures. Appraiser system
Identification unit
According to the structural points and the types of load-bearing systems of the identified building, one or more sections of the building that can be independently identified are divided into
an identification unit.
Sub-unit
Sub-system
The subdivided unit in the identification unit,
and the enclosure system are divided into three sub-units. 2.1.6 Component
member
-Generally, it can be further subdivided into the basic identification unit in the foundation and upper load-bearing structure subunit. It can be a single piece, an assembly or a fragment
dominant member
main member
a member whose failure will cause the failure of related members and endanger the operation of the load-bearing structure system.
common member
a member whose failure will not cause the failure of the main member. kindred member
a collection of all members of the same material and the same structural type in an identification unit.
2. 1. 10 Interrelafed member
a member connected to or supported by the identified member. 2.1.11 Inspection items of member Inspection items of member Investigation, testing or verification items determined for the factors affecting the reliability of the member. 2.1.12 Inspection items of sub-system Investigation, testing or verification items determined for the factors affecting the reliability of the sub-system R-resistance of structural member; S-effect of structural member; Y-structural importance factor; 2. Calculation span of bending members;
. Calculation length of compressive members:
1. Calculation span of the short direction of a spatial structure, 6—15-4
H-Total height of a column, frame or wall:
H,-Height between floors of a multi-story or high-rise building; W-Deflection of bending members;
△-Horizontal displacement value of the top of a column, frame or wall;-Measured bending sagitta of a member.
aa, ba, Cu, d.-safety level of a component or its inspection item; As, B, Ca, D.-safety level of a subunit or one of its components; A, Bu, Cau, D.-safety level of an identification unit; a., b, c, usability level of a component or its inspection item; A., B., C.-usability level of a subunit or one of its components; A., B, C.-usability level of an identification unit; a, b, c, d-reliability level of a component, A, B, C, D-reliability level of a subunit: 1, I, I, N-reliability level of an identification unit; A., B, C, D,--maintenance level of a subunit or one of its components; A, B, C, D,-adequacy level of an identification unit. Basic provisions
3.1 Assessment classification
Reliability assessment of civil buildings can be divided into safety assessment and normal usability assessment. 3. 1. 1
Assessment.
Reliability appraisal should be conducted in the following cases: 1) Comprehensive inspection before major repairs of buildings,
2) Regular inspection of important buildings;
3) Appraisal of changes in the use or use conditions of buildings; 4) Appraisal of continued use of buildings beyond the design reference period; 5) General survey for the formulation of maintenance and renovation plans for building complexes. In the following cases, only safety appraisal can be conducted: 2
1) Appraisal of dangerous buildings and various emergency appraisals;
2) Safety inspection before house renovation;
3) Inspection of temporary houses that need to extend their use period: 4) Safety issues found in usability appraisal. In the following cases, only normal usability appraisal can be conducted: 3
1) Inspection of daily maintenance of buildings;
2) Appraisal of building use functions;
3) Special appraisal of buildings with special use requirements. 3.2 Assessment procedures and work contents
Reliability assessment of civil buildings shall be conducted in accordance with the procedures specified in the following diagram (Figure 3.2.1).
The purpose, scope and content of the reliability assessment of civil buildings shall be determined after preliminary investigation based on the assessment principles and requirements proposed by the client in 3.2.2.
Preliminary investigation
Determine the purpose, scope and content of the assessment
[Establish an assessment group (or committee)] Detailed investigation Safety, usability assessment rating
Return cancer rating
Assessment report
Figure 3.2.1 Appraisal Procedure
Supplementary Adjustment
Maintenance Assessment
3.2.3 The preliminary investigation should include the following basic work contents: drawings and materials
such as geotechnical engineering survey report, design calculation book, design change record, construction drawing, construction and construction change record, completion drawing, completion quality inspection and acceptance documents (including cover engineering acceptance record), fixed-point observation record, accident handling report, maintenance record, previous reinforcement and renovation drawings, etc. Building history
such as original construction, previous repairs, renovations, changes in use, changes in use conditions, and disasters. Investigate the site according to the data to check the physical objects
Investigate the actual usability conditions of the building
and the internal and external environment, check the problems found, listen to the opinions of relevant personnel, etc. Fill in the preliminary investigation form (the format is shown in Appendix A of this standard). Formulate a detailed investigation plan and an outline of inspection and testing work and propose preparatory work to be completed by the client.
The detailed investigation can select the following work contents according to actual needs, 3. 2. 4
Survey of basic structural conditions:
1) Structural layout and structural form
2) Layout of beams, supports (or other lateral force resisting systems); 3) Structure and its supporting structure, components and their connection structures: 4) Structure and its detailed dimensions, and other relevant geometric parameters. Investigation and verification of structural use conditions:
1) Structural effects:
2) Internal and external environment of the building
3) Use history (including load history)
3 Inspection of foundation (including pile foundation)
1) Site type and foundation soil (including soil layer distribution and underlying layer conditions); 2) Foundation stability (slope);
3) Foundation deformation, or its reaction in the superstructure4) In-situ test and indoor physical and mechanical property test to evaluate the bearing capacity of the foundation: 5) Working status of foundation and piles (including cracking, corrosion and other damage inspections)
6) Influence or effect of other factors (such as groundwater pumping, foundation flooding, water quality, soil corrosion, etc.).
Material performance testing and analysis:
1) Structural component materials:
2) Connection materials:
3) Other materials.
5 Load-bearing structure inspection:
1) Working condition of components and their connections;
2) Working condition of structural support:
3) Crack distribution of buildings;
4) Structural integrity:
5) Lateral displacement of buildings (including foundation rotation) and local deformation, 6) Structural dynamic characteristics.
Functional inspection of enclosure system.
Inspection of piping systems susceptible to structural displacement7
3.2.5 The level, grade division, working steps and contents of the reliability appraisal rating of civil buildings shall comply with the following provisions:
The appraisal rating of safety and normal use shall be divided into three levels according to components, sub-units and appraisal units. Each level is divided into four safety levels and three usability levels, and should be carried out in layers starting from the first level according to the inspection items and steps specified in Table 3.2.5:
1) Determine the level of a single component based on the assessment results of each inspection item of the component; 2) Determine the level of the subunit based on the assessment results of each inspection item of the subunit and various components:
3) Determine the level of the appraisal unit based on the assessment results of each subunit. 2 The reliability appraisal rating of each level should be comprehensively determined based on the assessment results of the safety and normal usability of the level. The reliability level of each level is divided into four levels. 3 When only the safety or normal usability of a certain level is required to be appraised, the inspection and assessment work can only be carried out to the steps specified in the corresponding procedures of that level. 3.2.6 During the reliability appraisal process of civil buildings, if it is found that the investigation data is insufficient, a supplementary investigation should be organized in a timely manner.
Performance, grading and work content components of desirability setting rating
du.bu.tu.du
Subunits
A.Bu.C., D.
Based on the inspection items such as foundation deformation bearing capacity, foundation stability (slope), etc., foundation and other cushioning items are evaluated according to the types of materials and components.
Based on the inspection items, the applicability of the protective system is evaluated according to the bearing capacity, tree structure, displacement or damage that is not suitable for continued bearing, etc.
Each foundation rating
Each component rating
Table 3.2. 5
Inspection unit
AB.C..D..
Appraisal unit Safety
Inspection items Evaluation of single structure Transverse displacement Evaluation of upper component grade
Evaluation according to inspection items such as structure layout, support rating, surrounding beams, and inter-structure connection
Structural integrity grade
Evaluation of load-bearing part of enclosure system according to inspection items and steps of upper bearing structure
System load-bearing part safety level at each level
Upper city
Heavy structure
Figure protection system
System function
Foundation
According to the working status of the upper oxygen-bearing structure and enclosure
system, the foundation level
the upper bearingwww.bzxz.net
Au, Bu, C.
According to the displacement, crack , wind
Each component rating
Structural disease lateral displacement evaluation
Induced recovery and other inspection items
Evaluation of individual component level
Joint surface waterproofing, hanging,
top, wall, door and window, underground,
Setting unit normal use rating
Waterproofing and its ground protection facilities
Assessment of protection system
Yao Ping level| |tt||Functional level of the protection system
According to the inspection items and steps of the upper load-bearing structure, the serviceability level of each level of the load-bearing part of the enclosure system is evaluated as A, B, C, D
Upper load
List the same level of safety and normal serviceability results in parallel 1, 1,
Set the unit to be equal
Structure expression, or determine its reliability level rating according to the original provisions of this standard
Note: The foundation in the table includes pile foundation and pile 3.2.7 The repairability evaluation of civil buildings should be carried out separately for each component, each subunit and identification unit, and the evaluation results should be expressed in different repairability levels. The repairability level of each level is divided into four levels
3. 2.8 After the reliability appraisal of civil buildings is completed, an appraisal report should be submitted. The preparation of the appraisal report should comply with the requirements of Chapter 11 of this standard. 3.3 Determined rating standards
The various levels of classification standards for safety appraisal and rating of civil buildings shall be adopted in accordance with the provisions of Table 3.3.1
Safety Determined Classification Standards
Appraisal Object
Single component or its
Inspection Item
Classification Standards
Safety meets the requirements of this standard for a. Design, has sufficient bearing capacity
Safety road sign exceeds the requirements of this standard for du number
, does not significantly affect the bearing capacity Safety does not meet the requirements of this standard for a. Women
. Significantly affects the bearing capacity
Table 3.3.1
Handling requirements
No need to take measures
Measures to be taken
6—15—5
To be determined
The most sensitive
Inspection items
Inspection of subunits
For each
type of
item in the unit:
Sub-standard
Handling requirements
Safety level does not comply with this standard.
Must be written in time, that is,
[Number of requirements, has seriously affected the bearing capacity, take measures, safety complies with this standard. The safety of the slow
security product is slightly lower than the requirements of this standard for A, the safety of the city
does not avoid affecting the bearing capacity. The safety does not meet the requirements of this standard for A. The slow bearing capacity
does not need to take measures. The obstacles
does not need to take measures. The government must take measures in time or immediately. The safety of the slow
security product is not in accordance with the requirements of this standard for A, the safety of the city
has seriously affected the sensitive ability to take measures to increase the safety. The safety of the slow
security product is slightly lower than the requirements of this standard for As. It does not significantly affect the overall bearing capacity. The safety does not meet the requirements of this standard for A. The requirements of grade A and B have a significant impact on the overall bearing capacity. No measures may be taken. Some individual components must be taken immediately. Safety characteristics do not meet the requirements of this standard for A. Immediate measures must be taken. Safety characteristics do not meet the requirements of this standard for A. Grade A and B may have some general requirements, which do not affect the overall bearing capacity. The individual components should take measures. Safety characteristics do not meet the requirements of this standard for A. Some of the requirements of grade A and B may be slightly lower than the requirements of this standard for A. Some of the individual components should take measures, which do not significantly affect the overall bearing capacity. Safety characteristics do not meet the requirements of this standard for A. Some of the individual components should take measures. There may be very few components that obviously affect the overall bearing age. The safety of the components does not meet the requirements of this standard for A. Measures must be taken immediately. The overall bearing safety is slightly lower than the requirements of this standard for A. There may be very few structures that do not obviously affect the bearing safety. Measures must be taken immediately. The safety does not meet the requirements of this standard for A. Measures must be taken immediately. The overall bearing safety does not meet the requirements of this standard for Av. Seriously affect the sugar level, the first, this standard is difficult to. A, obvious and A garbage specific requirements and other slow not meet the requirements of the allowable Chapter 6 and Chapter 8 are excluded;
2. I about "no need to take measures" and "no measures to take" provisions. Only for safety adjustment. No need to correct the measures required for usability appraisal 13.3.2
The various levels of the civil building normal usability appraisal rating standards should be adopted according to the provisions of Table 3.3.2.
Requirements 3. 3. 2
Usability assessment classification standards
Assessment objects
Individual components or their
Inspection items
Quota standards
Resilience meets the requirements of this standard for level 2, has normal use functions
Safety is slightly lower than the requirements of this standard for level a. Design
[, the disease does not seriously affect the recovery of use
No need to take measures
No measures need to be taken
Usability does not meet the requirements of this standard for level 4. The most
measures
should be taken
requirements, the usability is in line with the requirements of this standard for 4. The
slow| ... Measures should be taken to meet the requirements of this standard for A. Measures may not be taken to significantly affect the use of the body. The use of the body is slightly lower than the requirements of this standard for A. There may be very few substances that affect the use of the body. Measures should be taken to significantly affect the use of the body. Measures should be taken to meet the requirements of this standard for A. Measures should be taken to significantly affect the overall use of the body.Usability characteristics meet the requirements of this standard. The most likely damage to the most components should be taken. The overall usability is slightly lower than that of this standard. There may be a few components B. The requirements of this standard for A. The usability does not significantly affect the overall use. Measures should be taken. The usability does not meet the requirements of this standard for A. The effective measures that significantly affect the overall recovery function should be taken. Generally, there are a few components that meet the requirements of this standard for Am. Measures should be taken. The overall usability is slightly lower than that of this standard for A. Grade B. Note: 1. The specific requirements of this standard for α, A, and A. grades, as well as the tolerance for non-compliance with the requirements for other grades, are respectively specified in Chapter 5, Chapter 7 and Chapter 8 of this standard. 2. The provisions of "no need to take measures" and "optional measures" in this document only apply to normal use, and do not include measures required for safety appraisal. The grading standards for each level of reliability appraisal rating of civil buildings shall be adopted in accordance with the provisions of Table 3.3.3. 3.3. Grading standards for reliability adjustment Adjustment object Single component Grading standards Reliability meets the requirements of this standard for α level, has normal bearing function and use function Reliability is slightly lower than the requirements of this standard for group, and does not significantly affect the bearing function and use function Reliability does not meet the requirements of this standard for α level, significantly affects the bearing function and use function Reliability does not meet the requirements of this standard for 4 level
performance requirements, has seriously affected safety
Table 3.3.3
handling requirements
no measures need to be taken
measures may not be taken
measures should be taken
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly or immediately
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures
must be taken promptly
resulting measures The group
should be collected and
newly affected the body's function
there may be individual components
oxygen immediate channel measures
and pure use ball
the accuracy is extremely inconsistent with the requirements of this standard for A
must be taken immediately, which has seriously affected the safety
and the availability
may be in line with the requirements of this standard for A. There may be very few
[requirements, which do not affect the overall carrying capacity and the general average degree of use. There are very few structures
whose availability is slightly lower than that of this standard for A The requirements of this standard must be met, but it has not significantly affected the overall bearing function and the use function. The reliability of the component does not meet the requirements of this standard. The reliability of the component does not meet the requirements of this standard. The general requirements of this standard must be met, which does not affect the overall bearing function and the use function. The reliability of the component does not meet the requirements of this standard. The reliability of the component does not meet the requirements of this standard. The reliability of the component does not meet the requirements of this standard. The general requirements of this standard must be met, which does not affect the overall bearing function and the use function. The reliability of the component is slightly lower than that of this standard. There may be very few components that do not meet the requirements of this standard, which have not significantly affected the bearing capacity; the components should be taken in terms of safety or performance and serviceability. Measures should be taken immediately if the difficulty does not meet the requirements of this standard. Measures should be taken immediately if the overall bearing capacity is significantly affected. The possibility of failure does not meet the requirements of this standard. The specific maximum and minimum limits of α, A and 1 forging and the allowable degree of exceeding the design limits of other components shall be stipulated in Chapter 9 of this standard. The classification standards for each level of civil building serviceability rating shall be adopted according to the provisions of Table 3.3.4, 3.3.4-1 and Table 3.3.4-2 respectively. Table 3.3.4-1: Components are easy to reinforce or replace, and the related structural problems are easy to deal with. Good repairability, and the repaired components can restore the function. Components are slightly difficult to reinforce or replace, and the related structural problems can be dealt with. Good repairability, and the functions can be restored or nearly restored after repair. Components are difficult to reinforce or replace, or the related structural problems are difficult to deal with. Poor repairability, and the functions will be affected after repair. Components are difficult to reinforce or replace, or the related structural problems are difficult to deal with. Components are difficult to reinforce or replace, or the related structural problems are difficult to deal with. In the case of poor repairability, only necessary measures can be taken from the perspective of safety. The repairability rating of subunits or certified units of the building is graded as follows: Table 3.3.4-2 Easy to repair, easy to transform, can restore the original function after repair, or the function after modification can meet the requirements of the current design standards, the total cost required is much lower than the cost of new construction, and the repairability is good. Slightly difficult to repair or transform, or difficult to transform, the repair shop can still restore or nearly restore the original function, or the function after modification can still meet the requirements of the current design standards, and the total cost required is less than 70% of the new construction cost. Repairable, suitable for repair or transformation
Good performance
Difficult to repair or transform: after repair or modification, the use function needs to be reduced or the use conditions need to be restricted. Or the total cost is more than 70% of the new construction cost. The repairability of the repairable object depends on its importance and use requirements. The repairable object is severely damaged, or the repair function is extremely poor, and it has no use value. Or the total cost is close to or exceeds the cost of the new construction. The repairability is very poor. Except for memorial or historical buildings, it is suitable for demolition and reconstruction. Note: This table is applicable to the repairability assessment of sub-units and appraisal units. In the "Grade" column, the grade above the slash is used for the pre-unit, and the grade below the new construction is used for the repair unit. General provisions for component safety appraisal rating The appraisal rating of the safety of a single component should be implemented according to the provisions of Sections 4.2 to 4.5 of this chapter according to the different types of components. 4.1.2 When verifying the bearing capacity of the identified structure or component, the following provisions shall be observed: The structural analysis method used in the verification of structural components shall comply with the provisions of the current national design specifications.
The calculation model used in the verification of structural components shall comply with its actual force and structural conditions.
The action on the structure shall be verified by investigation or inspection, and the value shall be taken in accordance with the provisions of Appendix B of this standard.
The determination of the effect of the action on the structural component shall comply with the following requirements! 1) The combination of actions, the partial factors of the actions and the combination value factors shall be implemented in accordance with the provisions of the current national standard "Code for Loading of Architectural Structures" (GBJ9). 2) When the structure is subjected to temperature, deformation and other effects, and has a significant impact on its bearing capacity, the additional internal forces generated by them shall be taken into account.
5 The standard value of the material strength of the component shall be determined according to the actual state of the structure according to the following principles:
1) If the original design document is valid and there is no doubt that the structure has serious performance degradation or design and construction deviations, the standard value of the original design can be used. 2) If the investigation shows that the actual situation does not meet the requirements of the above paragraph, the above requirements shall be met in accordance with Section 4.1.6. On-site inspections shall be conducted in accordance with the provisions of Article 6, and their standard values ​​shall be determined in accordance with the provisions of Appendix C of this standard.
6 The geometric parameters of structures or components shall be measured, and the effects of rust, scalloping, decay, insects, spotting, local defects or defects, and deviations from the work shall be taken into account. When it is necessary to check the design data, a review shall be conducted again according to the original design calculation book, construction drawings and as-built drawings.
The test data used for the safety appraisal of structural components shall meet the following requirements 4.1.3
The test method shall be adopted in accordance with the relevant current national standards. When more than one test method is required to be used for testing at the same time, the rules for comprehensively determining the test values ​​shall be agreed in advance, and shall not be handled arbitrarily afterwards.
2 The test shall be carried out according to the component units divided by this standard (see Appendix D), and detailed instructions on sampling and point distribution shall be provided. When there are many measuring points, a distribution map of measuring points shall be drawn.
When the damage test data has abnormal values, its judgment and processing shall comply with the provisions of the relevant national standards in force, and the data shall not be discarded at will. 4.1.4When it is necessary to evaluate the safety of structural components through load tests, it shall be carried out in accordance with the current special standards. If the test is qualified, it can be classified as α or b according to its integrity. If the test is unqualified, it can be classified as c or d according to its severity. Structural components can only be subjected to short-term load tests, and the impact of their long-term effects can be compensated by calculation.
4.1.5When the components in the building meet the following conditions, they do not need to participate in the appraisal: The component has not been affected by structural changes, repairs, maintenance or use, or changes in use conditions.
The component has no obvious damage
3The component is working normally and there is no doubt that its reliability is insufficient. If it is necessary to give the safety grade of the component in consideration of the need for other levels of appraisal and rating, it can be rated as α or b according to its actual integrity. 4.1.6 When inspecting the performance degradation of a component material due to time-related environmental effects or other systematic factors, it is allowed to use random sampling method to determine 5 to 10 components in the component as the inspection object, and measure their material strength or other mechanical properties according to the current inspection method standard. When the total number of components is less than 5, they should be inspected one by one. In the past,
2 When the client has stricter requirements for the material strength test of this component. The number of inspected components can also be appropriately increased through negotiation. 4.2 Concrete structural components
4.2.1 The safety appraisal of concrete structural components should be based on the four inspection items of bearing capacity, structure, displacement (or deformation) and cracking that are not suitable for continued bearing, and the grade of each inspected component should be evaluated separately, and the lowest level among them shall be taken as the safety grade of the component.
When the safety of concrete structural members is assessed according to the bearing capacity, the level of each verification item shall be assessed according to the provisions of Table 4.2.2
4.2.2, and then the lowest level shall be taken as the safety level of the bearing capacity of the member. Assessment of the bearing capacity level of concrete structural members Member category
Main members
·General members
Table 4, 2. 2
Note: 1 R and S in the table are the resistance and action effect of the structure respectively, which shall be determined according to the requirements of Article 4.1.2 of this standard1>. For the structural importance factor, the safety grade shall be selected according to the national design evaluation code on which the calculation is based, and the value of this coefficient shall be determined.
2 The calculation of structural overturning, sliding, fatigue and fracture shall comply with the provisions of the relevant national standards in force 4.2.3 When the safety of concrete structural members is evaluated according to the structure, the grades of the two inspection items shall be evaluated according to the provisions of Table 4.2.3, and then the lower grade shall be taken as the safety grade of the member structure.
Evaluation and inspection items for the structural grade of concrete structural members
, a or b grade
Table 4.2.3
c or du grade
The connection method is correct, and the structure meets the threshold. The connection method is not correct, and there are serious defects in the current national design specifications. There are no defects that have caused the connection (or node) to collapse, or there are only defects between the islands, and there are obvious deformations, cracks, and island pull-off. [No abnormality in work
Shear damage
6—15—7
Stress test embedded parts
cu level or b level
t. level or d. level
There are serious defects in the structure, which has caused the project
structure to be unreasonable. The stress can be expected, and there is no change
Embedded parts have obvious deformation, slippage, loosening, drift, loosening or other damage
or other damage
Note: " The assessment result is α. level or b. level, which can be determined according to its actual integrity; the assessment result is c. level or d. level, which can be determined according to its actual production degree. The age inspection result of the support length of the component does not participate in the detailed determination, but if there is a problem, it should be explained in the appraisal report and the treatment should be discussed.
4.2.4 When the safety of concrete structural members is evaluated based on displacement or deformation that is not suitable for continued bearing, the following provisions shall be observed; for the deflection of trusses (roof trusses, brackets), when the actual measured value is greater than 1/400 of its calculated span, its bearing capacity shall be verified in accordance with Article 4.2.2 of this standard. When verifying, the influence of additional stress caused by displacement shall be considered, and the rating shall be based on the following principles: 1) If the verification result is not lower than B. level, it can still be rated as B. level, but it is advisable to observe the limitation of use for a period of time.
2) If the verification result is lower than B. level, it can be rated as level or D level according to its actual severity.
For the deflection or construction deviation of other bending members, the lateral bending caused by the deviation shall be rated according to the provisions of Table 4.2.4.
The concrete bearing member shall not be too large to bear the deformation.
The loss of the bending height
Member category
Main components to be tested are main components, support components, etc.
Sensitive bending members
Material grade, surface grade,
, and deep dyeing
. 1. For calculating the degree of steel.
Note: 1
The rating shall be C or D. 2
Table 4.2. 4
co grade or d grade
>t/250
>t0/150
or>45mm
>10/200
>t/500
3 For the horizontal displacement (or inclination) of the column top, when its actual value is greater than the limit value listed in Table 6 and 3.5 of this standard, it shall be rated according to the following provisions: 1) If the displacement is related to the entire structure, the same level as the upper load-bearing structure shall be taken as the horizontal displacement grade of the column according to the evaluation results of Article 6.3.5 of this standard. 2) If the displacement is only an isolated event, the influence of this additional displacement shall be considered in the calculation of its bearing capacity, and the rating shall be based on the calculation results and the principle of paragraph 1 of this article. 3) If the displacement is still developing, it shall be directly rated as d. grade. 4.2.5 When stress cracks listed in Table 4.2.5 occur in concrete structural members, they should be regarded as cracks that are not suitable for continued load bearing and should be classified as Class C or Class D according to their actual severity.
Concrete components shall be evaluated and inspected no later than
Tests of the main period of stress (including shear strength and axial strength)
Controlled thin width
Shear test
Normal strength
High temperature environment
Any degree of strictness
Main components
Concrete
General components
Main components
Stress mixed
Control ±
Prestressed
General components
Any component
Adjustment of the pressure or
Prestressed concrete
Table 4. 2. 5
r or d. level
>0. 20 (0. 30)
>0. 30 (0.50)
>0. 10 (0. 20)
Number of occurrences
Note: The shear value in the key refers to the inclined pupil, and the medical treatment of the occurrence near the branch or the deepest part of the breeding
High-incidence environment refers to the large environment, the intermittent rain-prone part. The place affected by steam or water (such as the room, the room, the cold increase area, etc.) and the parts in direct contact with the soil,
3. The limit values ​​in the brackets are used for the error response of the 1, N and N groups. 4 The height of the board is based on the surface measurement, 4. 2.6 When non-stress cracks occur in the following situations in concrete structures, they should also be considered as unsuitable for continued bearing and should be classified as c. or d. according to their actual severity:
Cracks along the main reinforcement direction caused by corrosion of the main reinforcement, the crack width is greater than 1
6—15—8
2Cracks caused by temperature shrinkage and other effects, the width of which exceeds the bending crack width specified in Table 4.2.5 of this standard by 50%, and analysis shows that it has significantly affected the stress of the structure.
Note: When a concrete structural member has both stress-bearing and non-stress-bearing cracks, its grade should be evaluated according to Articles 4.2.5 and 4.2.6 of this standard, and the lower grade should be taken as the crack grade of the member.
When one of the following situations occurs in a concrete structural member, regardless of the crack width, it should be directly classified as d. Grade:
Concrete in the compression zone shows signs of damage:
2 The corner of the component is dropped and the concrete cover is seriously peeled off due to the corrosion of the main reinforcement. 4. 3 Steel structure components
4.3.1 The safety assessment of steel structure components shall be carried out according to the three inspection items of bearing capacity, structure and displacement (or deformation) that is not suitable for continued bearing, and the grade of each inspected component shall be assessed separately; for cold-bent thin-walled steel structures, light steel structures, steel piles and steel structures located in industrial areas with glass-corrosive media, or in high humidity and near-plum areas, the manufacturer shall use corrosion that is not suitable for continued bearing as an inspection item to self-assess their grades; then take the lowest grade as the safety grade of the component.
4.3.2 When the safety of steel structure components (including connections) is assessed according to the bearing capacity, the grade of each verification item shall be assessed separately according to the provisions of Table 4.3.2, and then take the lowest grade as the safety grade of the bearing capacity of the component. Assessment of the bearing capacity level of steel structural members (including connections) Component categories
Main components and their connections
General components
Note: 1 R and S in the table are the load and action effect of the structural member, respectively, which should be determined according to the requirements of Article 4.1.2 of this standard set. 7 is the structural importance coefficient. The safety level should be selected according to the current national design code on which the calculation is based, and the value of this coefficient should be determined. The calculation of structural tilt, displacement, fatigue and fracture should comply with the provisions of the current relevant national codes. When the component or connection has a radial fracture effect load opening, it should be directly rated as 3. When the safety of the structural member is evaluated according to the structure, it should be rated according to the provisions of Table 4.3.3.
Items for inspection of structural safety assessment standards for steel structure members
Connection structure
a. The connection method is correct, and the structure complies with the national standard 4.3.3.
tu or d,
the connection method is improper, and the structure has serious defects
(including trace defects), the structure or connection meets the design specifications, there are no defects, and the components only have single or sharp-angle cuts, local surface defects of welds, suppressors, and screws, and there is no abnormality in operation
there is no deformation, migration or other slow failure
Note: 1 The assessment result is taken as au or b, which can be determined according to its actual integrity, and the assessment result is taken as c, d or d. which can be determined according to its actual severity.
The defects of the weld seam refer to the defects of the weld seam such as the weld seam, ...
2) If the verification result is lower than Class B, it may be rated as Class C or Class D according to its actual severity.
For the lateral displacement of the truss point, when the actual measured value is greater than 1/200 of the truss height and is likely to develop, it should be rated as Class C. 3 For the stiffness of other bending members, or the lateral bending caused by the deviation, it should be rated according to the provisions of Table 4.3.4.
4 For the horizontal displacement (or inclination) of the column point, when the actual measured value is greater than the limit value listed in Table 6.3.5 of this standard, it should be rated according to the following provisions: 1) If the displacement is related to the entire structure, the level of the column that is alternating with the upper load-bearing structure should be taken as the horizontal displacement level of the column according to the evaluation results of Article 6.3.5 of this standard. 2) If the displacement is only an isolated event, the influence of this additional displacement should be considered in its bearing capacity verification, and the rating should be based on the verification results and the principle of the first number of this article. 3) If the displacement is still developing, it should be directly rated as d. Grade 5. For the bending of the column caused by deviation or other convenient reasons, when the actual measured value of the bending loss is greater than 1/660 of the free length of the column, the influence of the additional bending moment caused by it should be considered in the verification of the bearing capacity, and the steel structure deformation member is not suitable for sustained bearing according to the principles specified in paragraph 1 of this article. Evaluation and inspection items for deformation
Orientation
Main components
General components
Virtual components (short direction)
Floor filling (short direction)
Main components, supporting components
Other components
General components
Note, L. is the calculated depth of the component 1 1. is the calculated span of the short direction of the grid table 4. 3. 4
oxygen or d grade
>L,/200, and may develop
>1./250, and may develop
>10/300
>10/180
>a/120
>fo/660
ta/500
When the safety of a structural member is assessed as being unsuitable for continued bearing due to corrosion, in addition to verifying its bearing capacity based on the remaining intact section, it shall also be rated according to the provisions of Table 4.3.5.
Evaluation of structural components that are unsuitable for continued bearing
Table 4.3.5
At the main load-bearing parts of the structure, the average depth of the component surface is greater than 0.052, but not greater than 0.1t
At the main load-bearing parts of the structure, the average depth of the component surface is greater than 0.1t, where 1 is the wall thickness of the original surface of the component at the recovery part. Or the plate thickness of the defective plate.
Safety appraisal of masonry structural members shall be based on four inspection items, namely, bearing capacity, structure, displacement and cracks that are unsuitable for continued bearing. The grade of each inspected member shall be assessed separately, and the lowest grade shall be taken as the safety grade of the member. 4.4.2 When the safety of masonry structure is assessed based on bearing capacity, the grade of each verification item shall be assessed separately according to the provisions of Table 4.4.2, and the lowest grade shall be taken as the safety grade of the bearing capacity of the member.
Assessment of bearing capacity grade of masonry structural members
Component category
Main components
General components
In Table 4.4.2
, R and S are the resistance and action effect of the structural member respectively. They shall be determined according to the requirements of Article 4.1.2 of this standard. 7. is the structural importance coefficient. The safety grade is selected according to the current national design code on which the calculation is based, and the value of this coefficient is determined. 2 The calculation of the overturning of the structure shall comply with the provisions of the current relevant national standards. 3 When the minimum strength grade of the material does not meet the requirements of the current national standard "Code for Design of Masonry Structures (GBJ 3), even if the calculation result is higher than grade 1, it shall be determined as grade 2. 4.4.3 When the safety of masonry structural components is evaluated by structure, the grades of the two inspection items shall be evaluated separately according to the provisions of Table 4.4.3, and then the lower grade shall be taken as the safety grade of the component structure.
Safety assessment inspection items for structural components
au or b,
Table 4. 4. 3
r, grade d. grade
reach, the previous high compliance with the global slightly does not meet the current national design does not meet the requirements of the design code, the rate ratio
regulations follow the requirements
and has exceeded 10% of the limit
connection and construction method is not correct, the structure meets the connection or dynamic construction type improper structure has strict connection and its current national design code requirements,There are no defects or serious defects (including defects left over from construction), and there are only surface defects in the structure, and there is no abnormality in operation, which causes cracks, deformation, or looseness in the connection parts of the components, or other damage has been caused. Note: 1. The assessment result is α or d, which can be determined according to its actual integrity. The assessment result is cα or d, which can be determined according to its actual severity. 2. The support length of the component is not checked and the damage is not serious. It should be explained in the appraisal report and the treatment should be proposed.
When the safety of masonry structural members is evaluated according to the displacement or deformation that is not suitable for continued bearing, the following provisions shall be observed;
For the horizontal displacement (tilt) of the wall and column, when the actual measured value is greater than the limit value listed in Article 6.3.5 of this standard, the following rating shall be applied: 1) If the displacement is related to the entire structure, the same level as the upper load-bearing structure shall be taken as the horizontal displacement level of the wall and column according to the evaluation results of Article 6.3.5 of this standard.
2) If the displacement is an isolated event, the influence of this additional displacement shall be considered in the calculation of its bearing capacity. If the calculation result is not lower than Class B, it can still be rated as Class 6. If the calculation result is lower than Class B, it can be rated as Class Cu or Class D according to its actual severity. 3) If the displacement is still developing, it should be directly rated as Class D. Note: A reasonably constructed combined concrete column can be evaluated as a concrete column. 2 For the bending of columns (excluding columns with pilasters) caused by deviation or other reasons for use, when the measured value of the sagittal height is greater than 1/500 of the free length of the column, the influence of the additional bending moment shall be taken into account in the calculation of its bearing capacity, and the rating shall be made according to the principle of item 2 of paragraph 1 of this article based on the calculation results.
3 For the following displacements or deformations of arch or shell structural members, they may be rated as C. or D. according to their actual severity:
1) Horizontal displacement of the arch foot or the side beam of the arch; 2) Deformation of the arch axis or the curved surface of the simple arch or flat shell. 4.4.5 When the following stress cracks occur in the load-bearing members of the masonry structure, they shall be regarded as cracks that are not suitable for continued bearing and shall be reported as C. or D. according to their severity. Vertical cracks along the fracture (through) of the block material appear in the truss, the wall under the main beam support, the top or middle of the column.
Horizontal cracks or oblique cracks appear at the variable section of the load-bearing external wall of the open house. Cracks appear in the storage or support of the body; or although there are no cracks visible to the naked eye, it is found that there are concentrated loads in the storage range. Note: Block materials refer to bricks or flip blocks.
Cracks along the arch generatrix 4
or diagonal lines appear on the arch surface and shell surface of the simple arch, hyperbolic barrel arch, fan shell, etc.
Other obvious compression, bending or shearing caused by oblique cracks along the block fracture appear near the arch and shell support or on the supporting wall. 4.4.6 When the following non-stress cracks appear in the masonry structure, they should also be considered as cracks that are not suitable for continued load bearing and should be rated as cu or d according to their actual severity. Grade; full-length vertical cracks appear at the connection between the vertical and horizontal walls. 2 The cracks in the wall are serious, and the maximum crack width is greater than 5mm. The column has cracks with a width greater than 1.5 mm, or there are signs of fracture, dislocation, or other cracks that significantly affect the integrity of the structure. Note: Non-stress joints refer to cracks caused by temperature, shrinkage, deformation, or uneven settlement.
4.5 Timber structural members
4.5.1 The safety assessment of timber structural members shall be based on six inspection items, namely, load-bearing capacity, structure, displacement (or deformation) and cracks that are not suitable for continued load-bearing, and dangerous decay and insect infestation. The grade of each inspected member shall be assessed separately, and the lowest grade shall be taken as the safety grade of the member.
When the safety of wood structural members and their connections is assessed according to the bearing capacity, the level of each verification item shall be assessed according to the provisions of 4.5.2
Table 4.5.2, and the lowest level shall be taken as the safety level of the bearing capacity of the member. R/Ys
Component category
Main components and connections
General components
Table 4.5.2
Note that R and S in the table are the resistance and action effect of the structural member, respectively, and shall be determined according to the requirements of Section 4.1.2 of this standard! Y. For the important structural factor, the safety level shall be selected according to the national design code used for verification, and the value of this coefficient shall be determined.
6—15-9
When the safety of a timber structural member is assessed on a structural basis, the levels of the two inspection items shall be assessed separately in accordance with the provisions of Table 4.5.3, and the lower level shall be taken as the safety level of the member structure.
Safety assessment of structural components of this contraction
Check items
a. Forging or b. Photographing
Table 4.5.3
Photographing or d. Level
Correct connection and restoration method, structure meets the requirements of national current design
Improper connection method, serious structural defects (reduced design specification requirements, no defects, only (including defects left in construction), effective connection of local surface defects, good ventilation, no loose deformation, slippage, shear surface opening or other stress
Comply with or slightly fail to meet the requirements of national current design
Seriously fail to meet the requirements of current design specifications, recommended regulations, but no thrust is found and the thrust caused by it has caused cracks or balance in walls, columns, etc., 1 The evaluation result is α, which can be determined by the degree of goodness; the evaluation result is C. Grade 4, which can be determined according to its actual severity. The inspection results of the support length of the member are not included in the evaluation, but if there is a problem, it should be stated in the appraisal report and a treatment suggestion should be put forward. 4.5.4 When the safety of the wood structure member is not suitable for the displacement (or deformation) assessment of continued bearing, it should be rated according to the provisions of Table 4.5.4. The evaluation of the deformation of the structural member that is not suitable for continued bearing is as follows: the truss nest (frame, bracket) is large in size, the adjustment of the truss, the height of the side bend, the intersection of the side bend, or other compression members. Rectangular surface area is more than 10/200. 4.5. 4
>18/3000h, or>40/150
>/2400h, or>t0/120
>lo/100, or sheared
>la/200
>1p/150
Note, 1 t in the table is the calculated static; 4e is the unsupported length of the column; h is the cross-sectional height capsule. The curve is mainly caused by the growth of water materials or dry explosion, improper construction, 3 The assessment result is C or 4. The actual severity of the damage can be determined by the degree of damage. 4.5.5
When the structural member has an oblique texture or oblique crack with the following slope (p), it shall be rated as c. or d. according to its severity. For tension members and tension-bending members
For bending members and eccentric compression members
For compression members
When the safety of structural members is assessed according to the risk of decay or insect infestation, it shall be rated according to the following provisions in 4.5.6
In general, it shall be rated according to the provisions of Table 4.5.6. When the wood members in the sealing wall or insulation layer or their connections have been damp, even if the wood has not yet decayed, it shall be directly rated as c. Class. Evaluation Table of the risk of high decay and insect infestation of this temporary member 4.5.6
Thin compression decay
Upper load-bearing structural members
c. or d. Grade
The area of ​​the raw material on the gingival surface is greater than 5% of the total surface area, and the residual section verification is unqualified
The area of ​​the raw material on the cut surface is greater than 10% of the surface area of ​​the dry visible surface.
There is a new pregnancy
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