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For example,
BE001 BASE STORY Section Steel beam section dimensions do not conform to TBDY Table 9.3.The cross-section conditions of steel structural system beams with high ductility level and normal ductility level Width-to-Thickness Ratios.
Width-to-thickness ratios of highly ductile beams and moderately ductile beams are checked in accordance with TBDY Table 9.3. The cap width/thickness and body height/thickness ratios of steel elements should not exceed the AISC 341-16 Table D1.1. Limit values of Width-to-thickness ratios λ hd or λ md limit value are given in AISC 341-16 Table 9D1.31.
For detailed information, you can review the title below.
TBDY 2018 Controls for Steel Carrier System Types
Possible Solutions:
The cross section of the steel element whose name and floor are given can be changed.
When choosing a steel beam cross-section, a cross-section selection can be made to reduce the header width/thickness or body height/thickness ratio.
This cross-section condition is not met in the majority of my HEA type profiles. For this reason, another type of profile can be chosen.
If the structure is suitable, the ductility level can be resolved to a limited extent.
TBDY Table 9.3 AISC 341-16 Table D1.1 is given below.
Limiting Width-to-Thickness Ratios for Compression Elements for Moderately Ductile and Highly Ductile Members |
|---|
Description of Element | Width-to- Thickness Ratio | Limiting Width-to-Thickness Ratio | Example |
λhd
Highly Ductile Members | λmd
Moderately Ductile Members |
Flanges of rolled or built-up I-shaped sections, channels and tees; legs of single angles or double-angle members with separators; outstanding legs of pairs of angles in continuous contact | b/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.32\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Flanges of H-pile sections per Section D4 | b/t | not applicable | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.48\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Stems of tees | d/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.32\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Walls of rectangular HSS used as diagonal braces | b/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Flanges of boxed I-shaped sections | b/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Side plates of boxed I-shaped sections and walls of built-up box shapes used as diagonal braces | h/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Flanges of built up box shapes used as link beams | b/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Webs of rolled or built-up I shaped sections and channels used as diagonal braces | hw/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Where used in beams or columns as flanges in uniform compression due to axial, flexure, or combined axial and flexure: Walls of rectangular HSS Flanges and side plates of boxed I-shaped sections, webs and flanges of built-up box shapes
| b/t h/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.18\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Where used in beams, columns, or links, as webs in flexure, or combined axial and flexure: Webs of rolled or built-up I shaped sections or channels [b] Side plates of boxed I-shaped sections Webs of built up box sections
| h/tw h/t h/t | For Ca ≤ 0.114
| Mathinline |
|---|
| body | --uriencoded--$$ \small 2.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(1-1.04C_a) $$ |
|---|
|
For Ca > 0.114
| Mathinline |
|---|
| body | --uriencoded--$$ \small 0.88\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(2.68-C_a) $$ |
|---|
|
| Mathinline |
|---|
| body | --uriencoded--$$ \small \ge1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
where
| Mathinline |
|---|
| body | --uriencoded--$$ \small C_a=\frac%7BP_u%7D%7B\phi_cP_y%7D \; \; (LRFD) $$ |
|---|
|
| Mathinline |
|---|
| body | --uriencoded--$$ \small C_a=\frac%7B\Omega_c P_a%7D%7BP_y%7D \; \; (ASD) $$ |
|---|
|
| Mathinline |
|---|
| body | $$ \small P_y=R_yF_yA_g $$ |
|---|
|
| For Ca ≤ 0.114
| Mathinline |
|---|
| body | --uriencoded--$$ \small 3.96\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(1-3.04C_a) $$ |
|---|
|
For Ca > 0.114
| Mathinline |
|---|
| body | --uriencoded--$$ \small 1.29\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(2.12-C_a) $$ |
|---|
|
| Mathinline |
|---|
| body | --uriencoded--$$ \small \ge1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
where
| Mathinline |
|---|
| body | --uriencoded--$$ \small C_a=\frac%7BP_u%7D%7B\phi_cP_y%7D \; \; (LRFD) $$ |
|---|
|
| Mathinline |
|---|
| body | --uriencoded--$$ \small C_a=\frac%7B\Omega_c P_a%7D%7BP_y%7D \; \; (ASD) $$ |
|---|
|
| Mathinline |
|---|
| body | $$ \small P_y=R_yF_yA_g $$ |
|---|
|
|  |
Webs of built-up box sections used as EBF links | h/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.67\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.75\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Webs of H-Pile sections | h/tw | not applicable | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  |
Walls of round HSS | D/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.053\frac%7BE%7D%7BR_yF_y%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.062\frac%7BE%7D%7BR_yF_y%7D $$ |
|---|
|
|  |
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