This message is created by specifying the element name and floor on which it is located at the beginning of the report.
For example,
BE001 BASE STORY Steel beam section dimensions do not conform to Width-to-Thickness Ratios.
Width-to-thickness ratios of highly ductile beams and moderately ductile beams are checked in accordance with AISC 341-16 Table D1.1 and TBDY Chapter 9. Limit values of Width-to-thickness ratios λ hd or λ md are given in AISC 341-16 Table D1.1.
For detailed information, you can review the titles below.
Width-to-Thickness Ratios for SMF per AISC 341-16 with ideCAD
Limiting Width-to-Thickness Ratios for Compression Elements for Moderately Ductile Members per AISC 341-16 with ideCAD
Solutions:
The cross-section of the steel element whose name and floor are given can be changed.
Steel beam cross-section selection can be made to reduce the header width/thickness or body height/thickness ratio.
If it is possible, a moderate ductility level can be selected.
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--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
|---|
|
|  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 |
...
Symbols
λhd : Limiting slenderness parameter for highly ductile elements
λmd : Limiting slenderness parameter for moderately ductile elements
...