Steel Construction Institute-MWH internal informat

Steel Construction Institute-MWH internal information

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STANDARD INFORMATION

标准编号: Steel Construction Institute-MWH internal informat
所属分类: 其他国外标准与工程资料
文件语言: 英语
文件格式: PDF
文件页数: 6 页
文件大小: 4.51 MB

· 更新：2026-10-20

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标准 Steel Construction Institute-MWH internal information 的预览内容

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Preview of standard Steel Construction Institute-MWH internal information

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Steel Construction Institute-MWH internal informatPDF 第 1 页 · 原页码 1

We need answer user's request: produce HTML fragment only, no explanation. Need parse image OCR. Need obey strict tags/classes. Need output starts with h2 page title? Page has "Moment Connections" maybe header? It's at top left italic, likely running header? Filter says page header/footer ignore. But page content title "COLUMN TABLES" should be h2. Need include page number? Rule says page number by 5 placeholder? Actually output must end with

. But filter says page number bottom ignore (page number generated by 5 placeholder). So include 5. Need not include "Moment Connections" if header? It might be section header? It's top left italic, likely running header, ignore. Need include all content: definitions with terms left column and descriptions right. Could use table layout? Allowed table. Need preserve numbering? There are terms: Bolt row forces F_t1, F_t2 etc; Compression capacity P_c; Web panel shear capacity, P_v; Tension stiffeners; Supplementary web plate. Could represent as table with two columns? But table allowed. Need avoid style. Could use ? But layout-columns for two-column layout. However content is definition list-like. Could use table with th? But table semantics? Allowed. Need include Figure C3 caption and maybe image ignored, only caption. Need include table T1 with complex header and image in first cell? The table includes a diagram in first cell with labels. We can't output image, but can output text labels? The table cell contains diagram and text: trimming optional, corner snipe 15 x 15mm, b_sg, L_s, Stiffeners 10mm 12mm, Weld 8FW 10FW. Need represent as text in td. Could include

inside td? Allowed. Need table header: Table T1 Dimensions for tension stiffeners. Header rows: first row: empty? Actually table: top caption row: "Table T1 Dimensions for tension stiffeners" spans all? Then second header row: first cell diagram spans two rows? Serial Size spans two rows? M24 colspan 3, M20 colspan 3. Third header row: Width b_sg, Length L_s, Thickness t_s, Width b_sg, Length L_s, Thickness t_s. Need rowspan/colspan. Need ensure values 1-100. Could do:

... etc

...

Table T1 Dimensions for tension stiffeners
trimming optional corner snipe 15 x 15mm ...	Serial Size	M24			M20
trimming optional corner snipe 15 x 15mm ...	Serial Size	Width b_sg	Length L_s	Thickness t_s	Width b_sg	Length L_s	Thickness t_s
Stiffeners 10mm 12mm Weld 8FW 10FW	356 x 368

But first cell diagram includes labels maybe split: top cell includes trimming optional, corner snipe, b_sg, L_s; bottom cell includes Stiffeners, Weld. In original table first column spans all data rows? It appears first column has diagram and bottom text spanning all four rows? Yes first column cell spans all rows? It contains diagram top and text bottom. Could use rowspan=4 for first column. But header first column also part of same cell? In table, first column header cell with diagram spans header rows and data rows? It appears a single cell spanning all rows? The table has first column with diagram and text, spanning all rows including header? It is one cell from top under caption to bottom. But HTML table can have first cell rowspan=6? Need align with header. Could simplify: first column cell in thead rowspan=2? Then data rows have first column? But original first column spans entire table body and header? It's a single cell across all rows. Could use

in first row of thead? But thead can contain td? Allowed? Tags allowed td/th. But semantics maybe okay. Better: use table with first cell in first header row rowspan=6? But then header row has Serial Size etc. Need total rows: caption not row. Header row1: first cell rowspan=6, Serial Size rowspan=2, M24 colspan=3, M20 colspan=3. Header row2: 6 subheaders. Data rows 4. Total rows 6. So first cell rowspan=6. But first cell contains diagram text and bottom text. Could put all text in one td. But header first cell should be th? Could be th rowspan=6. It contains diagram labels. Use th? It's a header cell. Fine.

Need include Figure C3: image ignored, caption: "Figure C3 Stiff bearing lengths used in capacity calculations". Could include as

Figure C3 ...

. But there are labels in figure: 25mm end plate, 20mm end plate, P_c 79mm, P_c 59mm, connections with M24 bolts, connections with M20 bolts. Since image ignored, only output figure caption? Rule: images ignored, only output figure caption text. But figure contains text labels maybe part of image. Should we include them? It says only output figure caption text (e.g. Figure 1.1 xxx). So ignore figure internal labels. But maybe they are text not image? They are part of diagram. Could ignore. But content rules: title, paragraphs, lists, tables, formulas, figure captions. So only caption.

Need include definitions. Could use table layout-columns? The page has left term and right description. Could use

with rows? But table class layout-columns only for two-column layout. Could use table without class? Allowed. Need preserve terms. Maybe use

with two columns: first term, second description. But table semantics? It's a definition table. Could use

with rows. Need no thead? Could. But if use table, need caption? Not necessary. But maybe better use

? The left terms are hanging indent. Could use

Bolt row forces F_t1, F_t2 etc The bolt row forces...

. But original has term left and description right. Could use

...

Bolt row forces F_t1, F_t2 etc

...

. This preserves layout. Allowed class layout-columns. Need no style. Good.

Need handle subscripts: F_t1, F_t2, P_c, P_v, b_sg, L_s, t_s. Use _{tags. Need ensure allowed. For F_t1: F_t1? Original F_t1 maybe subscript t1. Use F_t1. For P_c: P_c. P_v: P_v. b_sg: b_sg. L_s: L_s. t_s: t_s. Need maybe P_c in figure ignored.}

Need include "The bolt row forces are the maximum acceptable on the column side of the connection calculated using the procedures in Section 2.8 for up to six rows of bolts." etc.

Need include "The bolt row forces are calculated assuming 90mm vertical pitch. They are slightly conservative in an extended end plate detail where the second row is 100mm below the first row."

Compression capacity: "P_c is the maximum acceptable compression force on the column flange. Crushing resistance and buckling resistance are calculated using the stiff bearing lengths shown in Figure C3, and the lesser resistance is quoted."

"Where the compressive force exceeds the resistance quoted, a pair of compression stiffeners may be provided, designed in accordance with Section 2, STEP 6A."

Web panel shear capacity: "P_v is the shear capacity of the column web and supplementary web plate when shown. Web panel shear must take account of beams connecting onto both column flanges and the direction of their respective moments. See Section 2, STEP 3."

Tension stiffeners: "A pair of rib stiffeners can be used to increase the resistance in the tension zone where either web tension or flange bending is limiting. The quoted bolt row forces in the Rib Stiffened column tables take this into account."

"Stiffeners may be sized in accordance with Table T1, or designed in accordance with STEP 6C"

Supplementary web plate: "A supplementary web plate can be used to increase web tension, shear and compression resistance. The Web Stiffened column tables take account of the increased web panel shear capacity and compression capacity available when a supplementary web plate, of the same grade steel as the column, is provided on one side only of the sections listed. The supplementary web plate should be sized in accordance with Section 2, STEP 6D. In the standard details shown, the web plate is not required to increase web tension resistance, and "fill in" welds are not required."

Need include Table T1. Need maybe include diagram text in first cell. Since image ignored? But table cell includes diagram with labels. It's part of table, not standalone figure. We should include text labels as table content. Need not include image. Could include:

trimming optional

corner snipe 15 x 15mm

b_sg

L_s

Stiffeners

10mm

12mm

Weld

8FW

10FW

Need maybe preserve line breaks? Could use
inside td? Allowed br. But rule says don't use br to create paragraph spacing; inside table cell line breaks okay? It says don't use
to create paragraph spacing. Could use

inside td? Allowed. But table cell with multiple paragraphs okay. Need avoid too many br? Could use

for each line. But inside th/td, p allowed. Need no style. For first cell, maybe:

trimming optional
corner snipe 15 x 15mm
b_sg
L_s
Stiffeners
10mm
12mm
Weld
8FW
10FW

But br inside th okay? It's not paragraph spacing? It's line breaks in cell. Could use

lines. But many p inside th maybe okay. Need no empty p. Use

trimming optional

corner snipe 15 x 15mm

... But p inside th allowed? Yes. But maybe too verbose. Could use br. Allowed br. Need no continuous spaces. Use single spaces.

Need table header: first cell maybe th rowspan=6. But if first cell contains diagram and bottom text, it's not header? Could be td. But table header row can have td? Allowed. But for accessibility, th. Use th.

Need ensure table structure valid: If first row has th rowspan=6, th rowspan=2, th colspan=3, th colspan=3. Second row has 6 th. Then 4 data rows each with 6 td? But first column already occupied by rowspan=6, so data rows should have 5 cells? Wait if first cell rowspan=6 covers first column for all 6 rows. Then row1 has first cell + Serial Size + M24 + M20 = 4 cells. Row2 has 6 subheaders? But first column occupied, so row2 should have 6 cells? Let's count columns: total columns = 1 (first) + 1 (Serial Size) + 3 + 3 = 8. Row1: first cell rowspan=6 (col1), Serial Size rowspan=2 (col2), M24 colspan=3 (cols3-5), M20 colspan=3 (cols6-8). Row2: first col occupied, Serial Size occupied, need 6 subheaders for cols3-8. Good. Data rows: first col occupied, need 5 cells? Wait total columns 8, first col occupied, remaining 7 columns: Serial Size (col2) + 6 subheaders. But data rows need Serial Size and 6 values = 7 cells. Yes. So data rows have 7 cells. Good.

But if first cell rowspan=6, data rows have 7 cells. Good.

Need table caption: "Table T1 Dimensions for tension stiffeners". Could include as caption.

Need maybe include "Serial Size" header. Data rows:

356 x 368 | 100 | 180 | 10 | 75 | 150 | 10

305 x 305 | 100 | 180 | 10 | 75 | 150 | 10

254 x 254 | 100 | 180 | 10 | 75 | 150 | 10

203 x 203 | 80 | 150 | 12 | 75 | 150 | 10

Need maybe first column bottom text spans data rows? If first cell rowspan=6 includes all, okay. But original first column has diagram top and bottom text. We can include all in first cell.

Need maybe include "trimming optional" and "corner snipe 15 x 15mm" with arrow labels. Could include as text.

Need include "Stiffeners 10mm 12mm Weld 8FW 10FW". Could format:

trimming optional

corner snipe 15 x 15mm

b_sg

L_s

Stiffeners

10mm

12mm

Weld

8FW

10FW

But p inside th maybe okay. Need no style. Could use
to reduce. But p inside th may be okay. Need ensure no blank lines? Fine.

Need include Figure C3 caption after definitions? In original figure is to right of compression/web definitions. Could place caption after web panel shear? Maybe after compression capacity? The figure is adjacent to compression and web panel. We can place after web panel shear paragraph or after compression? Need content order: definitions left, figure right. Since using layout table, figure caption could be in right column? But if we use layout-columns table for definitions, figure caption might be separate. Could include after web panel shear capacity row:

Figure C3 Stiff bearing lengths used in capacity calculations

. But original figure spans right of compression and web panel. Could place after web panel row. Fine.

Need maybe include "Figure C3" as h? No, caption. Use p align-center.

Need include page number 5 at end.

Need ensure no forbidden tags. No div. No style. No nbsp. No markdown.

Need maybe use for inline formula? Not needed.

Need maybe use for terms? Could. In layout table, first column terms bold? Original terms bold. Use .

Need maybe use

inside td for descriptions. Table layout-columns:

Bolt row forces F_t1, F_t2 etc	... ...
trimming optional corner snipe 15 x 15mm b_sg L_s Stiffeners 10mm 12mm Weld 8FW 10FW
...	Serial Size	M24	M20
Width b_sg
356 x 368	100	356 x 368	100	180	10	75	150	10

Table T1 Dimensions for tension stiffeners
trimming optional corner snipe 15 x 15mm b_sg L_s Stiffeners 10mm 12mm Weld 8FW 10FW	Serial Size	M24	M20
356 x 368	100	180	10	75	150	10
305 x 305	100	180	10	75	150	10
254 x 254	100	180	10	75	150	10
203 x 203	80	150	12	75	150	10

...
But table without thead? Allowed. Need maybe no caption. Good.
Need ensure class layout-columns only on table. Allowed.
Need maybe use
for continuation paragraphs? Not necessary.
Need maybe preserve "etc" line. Use "etc".
Need maybe include "P_c" in compression capacity term: "Compression capacity P_c".
Need maybe include "Web panel shear capacity, P_v".
Need maybe include "Tension stiffeners".
Need maybe include "Supplementary web plate".
Need maybe include "Stiffeners may be sized..." as separate paragraph in tension stiffeners description.
Need maybe include "Figure C3" caption after web panel? Could be in separate p.
Need maybe include "Table T1" after tension stiffeners.
Need maybe include "Supplementary web plate" after table.
Need maybe include "Moment Connections"? It's running header, ignore. But could be page title? Rule page output must start with h2 (page title). The main title is COLUMN TABLES. Use h2. Good.
Need maybe include "144"? Page number bottom ignore, but output must end with 5. So no 144.
Need maybe include licensed copy vertical text? Ignore (watermark/header). Good.
Need ensure no continuous two spaces. Use single spaces.
Potential issue: table first cell with p inside th may be considered block in th okay. But maybe too many p. Could use
. Allowed. Need no style. Use br inside th for line breaks. But rule 2: don't use br to create paragraph spacing. Inside table cell line breaks are okay. But to be safe, use
for separate lines? It creates paragraph spacing but inside cell maybe okay. Could use
for compact. I think br allowed. Need no empty lines.
Need maybe table first cell:
But b_sg and L_s are labels in diagram. Good.
Need maybe table header first cell should not be th? It's okay.
Need maybe table first row:
Second row:
... But first column occupied, second column occupied? Wait row2: first column occupied by rowspan=6, second column occupied by Serial Size rowspan=2. So row2 should have 6 th for subheaders. Good.
Data rows:
... But first column occupied, so row has 7 cells: Serial Size value then 6 values. Good.
Need ensure each data row has 7 cells. Let's count:
(col2), (col3), (col4), (col5), (col6), (col7), (col8). Good.
Need maybe include "Serial Size" values as td. Good.
Need maybe include "M24" and "M20" header. Good.
Need maybe include "Width b_sg" etc. Use sub.
Need maybe include "Length L_s" and "Thickness t_s". Good.
Need maybe include "Stiffeners" and "Weld" in first cell. Good.
Need maybe include "trimming optional" and "corner snipe 15 x 15mm". Good.
Need maybe include "b_sg" and "L_s" labels. Good.
Need maybe include "Figure C3" caption. Could include after web panel row. But if using layout table, figure caption outside table. Good.
Need maybe include "Stiff bearing lengths used in capacity calculations" line breaks? Use
Figure C3 Stiff bearing lengths used in capacity calculations
. Original has two lines. Could use
inside p? Allowed. But no paragraph spacing. Use
Figure C3
Stiff bearing lengths
used in capacity calculations
. But br okay. Or single line. Fine.
Need maybe include "connections with M24 bolts" etc? Figure internal labels ignored. But maybe they are text under figure? They are part of figure. Ignore.
Need maybe include "25mm end plate" etc? Ignore.
Need maybe include "P_c 79mm" etc? Ignore.
Need maybe include "Table T1 Dimensions for tension stiffeners" as caption. Good.
Need maybe include "Table T1" in caption. Good.
Need maybe include "Dimensions for tension stiffeners". Good.
Need maybe include "Supplementary web plate" term and description. Good.
Need maybe include quotes around "fill in". Use straight quotes? Original curly? Use "fill in". Allowed.
Need maybe include "STEP 6A", "STEP 3", "STEP 6C", "STEP 6D". Good.
Need maybe include "Section 2". Good.
Need maybe include "Rib Stiffened column tables". Good.
Need maybe include "Web Stiffened column tables". Good.
Need maybe include "same grade steel". Good.
Need maybe include "one side only". Good.
Need maybe include "not required". Good.
Need maybe include "maximum acceptable". Good.
Need maybe include "up to six rows of bolts". Good.
Need maybe include "90mm vertical pitch". Good.
Need maybe include "100mm below the first row". Good.
Need maybe include "crushing resistance and buckling resistance". Good.
Need maybe include "stiff bearing lengths shown in Figure C3". Good.
Need maybe include "lesser resistance is quoted". Good.
Need maybe include "compressive force exceeds the resistance quoted". Good.
Need maybe include "pair of compression stiffeners". Good.
Need maybe include "shear capacity of the column web and supplementary web plate when shown". Good.
Need maybe include "Web panel shear must take account of beams connecting onto both column flanges and the direction of their respective moments." Good.
Need maybe include "A pair of rib stiffeners can be used to increase the resistance in the tension zone where either web tension or flange bending is limiting." Good.
Need maybe include "The quoted bolt row forces in the Rib Stiffened column tables take this into account." Good.
Need maybe include "Stiffeners may be sized in accordance with Table T1, or designed in accordance with STEP 6C". Good.
Need maybe include "A supplementary web plate can be used to increase web tension, shear and compression resistance." Good.
Need maybe include "The Web Stiffened column tables take account of the increased web panel shear capacity and compression capacity available when a supplementary web plate, of the same grade steel as the column, is provided on one side only of the sections listed." Good.
Need maybe include "The supplementary web plate should be sized in accordance with Section 2, STEP 6D." Good.
Need maybe include "In the standard details shown, the web plate is not required to increase web tension resistance, and "fill in" welds are not required." Good.
Need maybe include "Bolt row forces F_t1, F_t2 etc" term. Could use Bolt row forces F_t1, F_t2 etc. Good.
Need maybe include "Compression capacity P_c" term. Good.
Need maybe include "Web panel shear capacity, P_v" term. Good.
Need maybe include "Tension stiffeners" term. Good.
Need maybe include "Supplementary web plate" term. Good.
Need maybe use table layout-columns for definitions. But table with class layout-columns and no thead? Allowed. Need maybe each row td. Good.
Potential issue: Rule 9: each page output must start with
(page title). We'll start with
COLUMN TABLES
. Good.
Potential issue: Rule 10: pre only contains code. We won't use pre.
Potential issue: class small-note? Not needed.
Potential issue: no style. Good.
Potential issue: no . Good.
Potential issue: no continuous two spaces. Need check text: "356 x 368" single spaces. "15 x 15mm" single. Good.
Potential issue: no Markdown. Good.
Potential issue: no HTML shell. Good.
Potential issue: no page number 144. Good.
Potential issue: no header "Moment Connections". Good.
Potential issue: no vertical licensed copy. Good.
Potential issue: no figure image. Good.
Potential issue: table first cell with br maybe okay. Need ensure no line with two spaces. Good.
Need maybe include "Figure C3" after web panel row. But if we put after layout table, it may appear after all definitions including tension stiffeners? Original figure is before tension stiffeners? Actually figure is to right of compression and web panel, before tension stiffeners. If we put after web panel row inside layout table? Could include in right column of web panel row? But figure caption belongs to figure, not definition. Could place after web panel row as separate p before tension stiffeners. But if definitions are in one table, can't insert p between rows. Could split layout table into multiple tables? Or use table rows and after table? But order: Bolt row, Compression, Web panel, Figure C3, Tension stiffeners, Table T1, Supplementary. If we put figure caption after entire definitions table, it appears after tension stiffeners, not ideal. Could instead not use one table; use separate layout tables for each definition? Or use paragraphs with indent? Need preserve order. Could use

Bolt row forces F_t1, F_t2 etc
...
...

trimming optional
corner snipe 15 x 15mm
b_sg
L_s
Stiffeners
10mm
12mm
Weld
8FW
10FW
... Serial Size M24 M20

Width b_sg
356 x 368 100 356 x 368 100 180 10 75 150 10
for each term-description pair, then figure caption between. That's allowed. Multiple tables. Or use one table but include figure caption in a row spanning columns? Could add a row with td colspan=2 containing figure caption. But table class layout-columns? Could. But table semantics? Maybe okay. Simpler: use separate
for each definition? That may be verbose but preserves order. Or use
term description
with indent? But original two-column. Could use
? Not exact. But acceptable? Need faithful. Could use table for each pair.
Maybe use one table with rows and include figure caption row:

...

term desc

Figure C3...

Tension stiffeners ...

But empty td? Allowed? It's a cell. But no content? Could be empty. Is empty td okay? Probably. But maybe avoid empty by using
. Allowed. But maybe no meaningless blank? It's layout. Could instead put figure caption in first column? Not ideal. Could use
Figure C3...
. But table class layout-columns with colspan? Allowed only td/th rowspan/colspan. Yes. But layout-columns table with colspan okay. But if first row has two columns, colspan=2 okay. Need ensure table has consistent columns? Not strict. Could do.
But if we use table for definitions, adding figure caption row with colspan=2 may be okay. However table class layout-columns intended two-column layout. Good.

Need maybe include figure caption after web panel row. Good.

Need maybe include Table T1 after definitions table. Good.

Need maybe include Supplementary web plate after Table T1. Could use separate layout table or paragraph. Since after table, use
Supplementary web plate ...
. Good.
Need maybe include "Stiffeners may be sized..." in tension stiffeners description. Good.

Need maybe include "Figure C3" caption row inside definitions table. Good.

Need maybe include "Table T1" after definitions. Good.

Need maybe include "Supplementary web plate" after table. Good.

Need maybe include "Bolt row forces" description two paragraphs. Use
inside td. Good.

Need maybe include "Compression capacity" description two paragraphs. Good.

Need maybe include "Web panel shear capacity" description one paragraph. Good.

Need maybe include "Tension stiffeners" description two paragraphs. Good.

Need maybe include "Supplementary web plate" description one paragraph. Good.

Need maybe include "Figure C3" caption row:
Figure C3
Stiff bearing lengths
used in capacity calculations
. But if table has two columns, colspan=2. Good.
Need maybe include empty first column? Not needed.

Potential issue: table class layout-columns with colspan may be considered layout table. Fine.

Need maybe include "Figure C3" before Table T1. Good.

Need maybe include "Table T1" after definitions. Good.

Need maybe include "Supplementary web plate" after Table T1. Good.

Need maybe include page number 5. Good.

Need maybe ensure all tags closed. Good.

Need maybe no attributes other than class, rowspan, colspan. Good.

Need maybe class values single. Good.

Need maybe no style. Good.

Need maybe no h1. Good.

Need maybe no ol/ul. Good.

Need maybe no blockquote. Good.

Need maybe no pre/code. Good.

Need maybe no hr. Good.

Need maybe no a/img. Good.

Need maybe no base64. Good.

Need maybe no comments. Good.

Need maybe no explanation. Final only HTML.

Let's draft.

COLUMN TABLES

Bolt row forces F_t1, F_t2 etc
The bolt row forces are the maximum acceptable on the column side of the connection calculated using the procedures in Section 2.8 for up to six rows of bolts.
The bolt row forces are calculated assuming 90mm vertical pitch. They are slightly conservative in an extended end plate detail where the second row is 100mm below the first row.

Compression capacity P_c
P_c is the maximum acceptable compression force on the column flange. Crushing resistance and buckling resistance are calculated using the stiff bearing lengths shown in Figure C3, and the lesser resistance is quoted.
Where the compressive force exceeds the resistance quoted, a pair of compression stiffeners may be provided, designed in accordance with Section 2, STEP 6A.

Web panel shear capacity, P_v
P_v is the shear capacity of the column web and supplementary web plate when shown. Web panel shear must take account of beams connecting onto both column flanges and the direction of their respective moments. See Section 2, STEP 3.

Figure C3
Stiff bearing lengths
used in capacity calculations

Tension stiffeners
A pair of rib stiffeners can be used to increase the resistance in the tension zone where either web tension or flange bending is limiting. The quoted bolt row forces in the Rib Stiffened column tables take this into account.
Stiffeners may be sized in accordance with Table T1, or designed in accordance with STEP 6C

Table T1 Dimensions for tension stiffeners

trimming optional
corner snipe 15 x 15mm
b_sg
L_s
Stiffeners
10mm
12mm
Weld
8FW
10FW Serial Size M24 M20

Width b_sg Length L_s Thickness t_s Width b_sg Length L_s Thickness t_s

356 x 368 100 180 10 75 150 10

305 x 305 100 180 10 75 150 10

254 x 254 100 180 10 75 150 10

203 x 203 80 150 12 75 150 10

Supplementary web plate
A supplementary web plate can be used to increase web tension, shear and compression resistance. The Web Stiffened column tables take account of the increased web panel shear capacity and compression capacity available when a supplementary web plate, of the same grade steel as the column, is provided on one side only of the sections listed. The supplementary web plate should be sized in accordance with Section 2, STEP 6D. In the standard details shown, the web plate is not required to increase web tension resistance, and "fill in" welds are not required.

5

Need check table T1 first cell rowspan=6 but thead has 2 rows, tbody 4 rows = 6. Good. But first cell in thead with rowspan=6 extends into tbody. Valid? Yes, rowspan can span across tbody? In HTML, rowspan can span rows in same table, across tbody? It can, but if first cell in thead rowspan=6, it spans into tbody. Is that valid? I think rowspan can cross tbody boundaries? HTML table model: rowspan can span rows in the same table, but if it starts in thead and extends into tbody, maybe allowed? It might be allowed but not ideal. Could instead put first cell in tbody? But header structure? Alternative: use table without thead? But rule says table header use thead/tr/th. Could have first cell in thead rowspan=2 only, and data rows first column? But original first column spans all rows. Could split first column into header cell and data cell? Maybe simpler and valid: first column header cell rowspan=2 containing diagram top labels, then data rows first column rowspan=4 containing bottom labels? But original first column is one cell. But HTML validity more important. Could do:
trimming optional
corner snipe 15 x 15mm
b_sg
L_sSerial Size... subheaders Stiffeners
10mm
12mm
Weld
8FW
10FW356 x 368...
...

This is valid and preserves content. But first column not one cell, but okay. Need data rows then have first column occupied by rowspan=4, so each data row has 6 cells? Wait total columns 8. Row1 header: first col, Serial Size, M24, M20. Row2:

Steel Construction Institute-MWH internal informatPDF 第 2 页 · 原页码 2

CAPACITY TABLES AND DIMENSIONS FOR DETAILING

		Pages
Bolted End Plate Connection Capacity Tables
Notes on use		142 - 144
Example	- Partial strength connections	145 - 146
Example	- Full strength connection	147
Example	- Connection with axial tension	148
Example	- Connection with axial compression	149
Beam tables	- Design grade 43 steel	150 - 165
Beam tables	- Design grade 50 steel	166 - 181
Column tables	- for M24 bolted connections	182 - 184
Column tables	- for M20 bolted connections	185 - 187
Portal Frame Connection Capacity Tables
Notes on Use		188
Example		189
Eaves connection tables		190- 198
Apex connection tables		199 - 201
Wind-Moment Connection Capacity Tables
Notes on use		202
Example		203 - 204
Beam and column tables		205 - 218
Dimensions		219
Material strengths & Fastener Capacity Tables
Steel strengths, bolt & electrode strengths		220
Ordinary bolts	- capacities	221
'HSFG' bolts	- capacities	222
Countersunk bolts	- capacities	223
Weld	- capacities	224
Dimensions for Detailing
Ordinary bolt assemblies		225
High strength friction grip assemblies		226
Bolt access dimensions		227
Holding down bolts		228
Dimensions for :
Universal beams		229 - 231
Universal columns		232
Joists		233

Steel Construction Institute-MWH internal informatPDF 第 3 页 · 原页码 3

BOLTED END PLATE CONNECTIONS

Notes on use of the Beam-to-Column Capacity Tables.

BEAM TABLES

Bolt row forces F_t1, F_t2 etc	The bolt row forces shown are the maximum available on the beam side of the connection, calculated using the procedures in Section 2.8. The standard end plate thicknesses adopted in the tables exceed the limit for full plastic force distribution quoted in Table 2.7, and therefore the triangular limit has been imposed in all cases. The sum of the bolt row forces, Σ F_r, is limited to the compression flange resistance. If the compression flange resistance governs, the bolt row forces have been reduced, starting at the lowest row; the maximum values are shown in brackets below the reduced values.
ΣF_r	ΣF_r is the sum of the maximum available bolt row forces, in tension, on the beam side when no axial forces are present.
Beam P_c	Beam P_c is the capacity of the beam compression flange. This is based on the smaller of the beam width or end plate width.
Moment capacity	The moment capacity is that of the beam side of the connection, calculated from the quoted bolt row forces.
Beam M_cx	M_cx is the moment capacity of the beam section.
Bolt shear capacity	The bolt shear capacities shown are the vertical shear capacity of each bolt row in the tension zone, and of each row in the shear zone. Bolt rows in the tension zone are shown in black. Bolt rows in the shear zone are shown in grey.
Mini haunches	The bolt row forces are based on the lightest section in the serial size(s) covered. The haunch flange and web are taken as being the same steel grade as that of the beam section The minimum haunch depth used in the tables is one third of the section depth. Moment capacities are quoted for increasing depths of haunch, until M_cx of the beam is exceeded, or the maximum haunch depth is reached. The maximum haunch depth is taken as D_b – T_b – r_b – 10. It is recommended that the mini haunch is made with the flange sloping at an angle of 30° to the beam flange. The capacity of the beam web in compression should be checked in accordance with Section 2, STEP 8. If the haunch is built up from plates, the web plate should be of similar thickness to the beam web.
Min. thickness of haunch flange	The minimum thickness shown for the haunch flange is that required for the flange to develop ΣF_r based on the width of the flange being equal to the beam width, or the end plate width if this is narrower. It is calculated using an angle of 30° between beam and haunch flange. The haunch flange width should be at least as wide as the end plate or beam flange (whichever is narrower). If, after matching with the column resistance, ΣF_r is reduced from the quoted value, the minimum thickness of the haunch flange may be reduced in proportion to the reduction in ΣF_r.
Welds	Forces and capacities quoted in the tables are based on welds to design grade 43 beams being made with E43 electrodes to BS 639, and welds to design grade 50 beams being made with E51 electrodes to BS 639; all in accordance with Table 36 of BS 5950 Part 1. It should be noted that the calculation of forces and capacities take account of the weld sizes shown. Weld sizes should not be changed without re-checking the connection.

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Tension flange weld	The weld size is designated as a fillet weld (e.g. 8FW), a partial penetration butt weld with a superimposed 10mm fillet (e.g. 10FW+6pp), or a full penetration butt weld (FPB). The fillet welds and partial penetration welds are required around the whole flange to the junction with the root and beam web. The size is calculated to provide a capacity which is not less than the maximum force from the top three bolt rows in an extended end plate, and the maximum force from the top two rows in a flush end plate, or equal to the full strength of the flange. The sizes indicated for partial penetration butt welds with superimposed fillets take account of a 3mm loss of penetration at the root of the weld. The detail is shown in Figure C1. The shear and tension stresses on the fusion faces have been checked in accordance with STEP 7 of the procedures in Section 2. In many cases, a manual check using the actual bolt row forces may obviate the requirement for the partial penetration weld, but the fillet size quoted should not be reduced without re-checking the connection. Figure C1 Partial penetration welds with superimposed fillets
Web weld	A continuous fillet weld each side of the web of the leg length shown provides a capacity not less than that of the beam web.
Compression flange weld	In the extended and flush end plate cases bearing contact between the compression flange and end plate is assumed, and nominal fillet welds are therefore prescribed. These weld sizes will also be satisfactory if bearing is provided in the haunched case. If a bearing fit is not specified, the welds between flange and end plate should be calculated manually. The end plate should extend a minimum of the plate thickness plus weld leg length below the flange as shown in Figure C2. (The column tables are not valid if this recommendation is infringed) Figure C2 End plate extension below compression flange
Axial forces in the beam	The tables assume axial force in the beam is zero. If present, the axial force should be considered to act at the centre of compression and the applied moment modified accordingly (Section2, STEP 4). Worked examples on pages 148 and 149 show how the tables may be used to design the connection when axial force is present in the beam. Increased capacity with axial loads may be obtained when the rigorous method is applied to both the beam and the column. Axial compression reduces the applied moment, and increases the force in the compression flange. This may require the bolt row forces to be reduced, starting with the lowest row if the beam compression flange capacity was (or becomes) limiting. Axial tension increases the applied moment, and reduces the force in the compression flange. If, with no axial load, the compression flange is limiting, then the reduction in force will allow an increase in bolt row forces, up to the maximum values available (shown in brackets in the tables). The minimum flange thickness to the mini haunch is based on ΣF, as explained on page 142. However, in the presence of axial compression, the minimum thickness should be increased in proportion to the actual flange force, compared to ΣF, quoted.

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Bolt row forces F_t1, F_t2 etc	The bolt row forces are the maximum acceptable on the column side of the connection calculated using the procedures in Section 2.8 for up to six rows of bolts. The bolt row forces are calculated assuming 90mm vertical pitch. They are slightly conservative in an extended end plate detail where the second row is 100mm below the first row.
Compression capacity P_c	P_c is the maximum acceptable compression force on the column flange. Crushing resistance and buckling resistance are calculated using the stiff bearing lengths shown in Figure C3, and the lesser resistance is quoted. Where the compressive force exceeds the resistance quoted, a pair of compression stiffeners may be provided, designed in accordance with Section 2, STEP 6A.
Web panel shear capacity, P_v	P_v is the shear capacity of the column web and supplementary web plate when shown. Web panel shear must take account of beams connecting onto both column flanges and the direction of their respective moments. See Section 2, STEP 3.
Figure C3 Stiff bearing lengths used in capacity calculations
Tension stiffeners	A pair of rib stiffeners can be used to increase the resistance in the tension zone where either web tension or flange bending is limiting. The quoted bolt row forces in the Rib Stiffened column tables take this into account. Stiffeners may be sized in accordance with Table T1, or designed in accordance with STEP 6C

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COLUMN TABLES

COLUMN TABLES

CAPACITY TABLES AND DIMENSIONS FOR DETAILING

Contents

BOLTED END PLATE CONNECTIONS

BEAM TABLES

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