公共合同 适用于公共工程合同的通用条款手册 第61分册 桥隧工程的设计、计算和试验 第2卷 - 公路桥荷载和试验程序

注释

1.2 * 为了方便计算，然而在某些情况下，将作用在一部件上作用力分解为两个部分是可取的：一部分是荷载 B 造成的局部作用力，另一部分是由荷载 A 造成的一般作用力，这两部分分作用力可以合并。特殊规则规定了合并条件以及结果的计算模式。（例如正交异形板的验证）。

** B 荷载一般用作验证各种桥面板部件，即路面下条板，横梁、纵梁、桥的构件。

除了前面注释中提到的特殊情况外，荷载 A 和荷载 B 系统依次用于所有验证，在验证中结构是当做整体的。但是，根据一般不良习惯，我们只对重大作用力系统进行验证，两种系统产生的各种作用力的对比，不仅取决于桥梁的等级（在下文第 3 条定义了桥梁等级），而且取决于其它因素，如路的宽度和承载结构性质等，反映这些因素的是动态增加系数，和尤其是不同的离心系数，它们是作用在结构力学轴线上的偏心荷载下的离心系数。我们在下文指出可采纳的一般规则。当荷载长度小于 10 米时，在所有情况下，认为系统 B 更具有优势。

在三级构造物情形下，用 B 系统一般更有优势。

1.3 * 设备部主动提议下（第 10 条的各种荷载），或按照军事当局要求（第 9 条的荷载），宣布了此等级。

** 注：在一定的情况下，也可参考其它类型的荷载，尤其是桥梁。它承受一段公路或高速公路施工过程中的往来施工重型机械的交通；C.P.S.确定了要考虑车辆的特性和计算模式。

第 2 条 - 可载宽度一车道数

2.1 * 重申行车宽度定义是取防护阻拦设施或路肩之间的宽度；除了所谓行车道外此宽度，即包括所有可能的外加宽度，如减速带，停车带等，人们还要预计到将来道路的扩宽，在设计路面最终形态中需要考虑到这点。

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NORME INTERNATIONALE INTERNATIONAL STANDARD МЕЖДУНАРОДНЫЙ СТАНДАРТ

50(715) © IEC:1996

CONTENTS

:current

Foreword

This document (EN 10216-3:2002) has been prepared by Technical Committee EC/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.

Other Parts of EN 10216 are:

Another European Standard series covering tubes for pressure purposes is:

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

5

ISO 657-1 : 1988 (E)

Table 1 — Dimensions and sectional properties of hot-rolled equal-leg angles (concluded)

NOTES

1. Member countries may choose, to be included in their national standards, the sizes which are required to meet their demand.
2. For the angles so chosen, only thicknesses which can be rolled in their mills to meet the demand of the users may be selected from the list of thicknesses corresponding to equal angles in table 1.
3. The sectional area has been calculated using the formula

   S = [l/2 A - l) + 0,214 6 (r_root² - 2r_toe²)] × 1/100

   where
   

   S is the sectional area, in square centimetres;
   

   l is the thickness, in millimetres;
   

   r_root is the root radius, in millimetres;
   

   r_toe is the toe radius, in millimetres;
   

   A is the leg length, in millimetres.

4. Mass is calculated on the basis of density of steel of 7,85 kg/dm³.

   4