This message is created by specifying the element name and floor on which it is located at the beginning of the report.
For example,
SBR001 BASE STORY Section dimensions do not conform toTBDY Table 9.3.
Cross-section conditions of steel structural system braces with high ductility level and normal ductility level are checked in accordance with TBDY Table 9.3. The head width/thickness and body height/thickness ratios of steel elements should not exceed the λ hd or λ md limit value given in Table 9.3 .
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 brace whose name and floor are given can be changed.
When choosing a steel cross-section, a cross-section selection can be made to reduce the header width/thickness or body height/thickness ratio.
If the structure is suitable, the ductility level can be resolved to a limited extent.
TBDY Table 9.3 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--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
Flanges of H-pile sections per Section D4 | b/t | not applicable | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.48\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
Stems of tees | d/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.32\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 1.18\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
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 | $$ \small P_y=R_yF_yA_g $$ |
|---|
|
|  Image Added |
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--$$ \normalsize 1.75\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
Webs of H-Pile sections | h/tw | not applicable | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  Image Added |
Walls of round HSS | D/t | | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.053\frac%7BE%7D%7BR_yF_y%7D $$ |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--$$ \normalsize 0.062\frac%7BE%7D%7BR_yF_y%7D $$ |
|---|
|
|  Image Added |
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icons
λ hd : Cross-section condition limit value for elements with high ductility level
λ md : Cross-section condition limit value for elements with limited ductility level
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