How does ideCAD control intermediate moment frame requirements according to ACI 318AISC 341-1916?
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Beams should be provided to brace the requirements for moderately ductile members in Section D1.2a. It’s important to design beam braces that are placed near concentrated forces and changes in cross-section. It’s automatically controlled and reported by the program.
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Beam and column members should provide the requirements for moderately ductile members according to Table D1.1.
Limiting Width-to-Thickness Ratios for Compression Elements for Moderately Ductile and Highly Ductile Members |
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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 |
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| body | --uriencoded--$$ \normalsize 0.32\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Flanges of H-pile sections per Section D4 | b/t | not applicable | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.48\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Stems of tees | d/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.32\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.40\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Walls of rectangular HSS used as diagonal braces | b/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Flanges of boxed I-shaped sections | b/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Side plates of boxed I-shaped sections and walls of built-up box shapes used as diagonal braces | h/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Flanges of built up box shapes used as link beams | b/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.76\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Webs of rolled or built-up I shaped sections and channels used as diagonal braces | hw/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  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 |
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| body | --uriencoded--$$ \normalsize 0.65\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 1.18\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  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 |
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| body | --uriencoded--$$ \small 2.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(1-1.04C_a) $$ |
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For Ca > 0.114
| Mathinline |
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| body | --uriencoded--$$ \small 0.88\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(2.68-C_a) $$ |
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|
| Mathinline |
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| body | --uriencoded--$$ \small \ge1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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where
| Mathinline |
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| body | --uriencoded--$$ \small C_a=\frac%7BP_u%7D%7B\phi_cP_y%7D \; \; (LRFD) $$ |
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| Mathinline |
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| body | --uriencoded--$$ \small C_a=\frac%7B\Omega_c P_a%7D%7BP_y%7D \; \; (ASD) $$ |
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|
| Mathinline |
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| body | $$ \small P_y=R_yF_yA_g $$ |
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| For Ca ≤ 0.114
| Mathinline |
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| body | --uriencoded--$$ \small 3.96\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(1-3.04C_a) $$ |
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For Ca > 0.114
| Mathinline |
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| body | --uriencoded--$$ \small 1.29\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D(2.12-C_a) $$ |
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|
| Mathinline |
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| body | --uriencoded--$$ \small \ge1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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where
| Mathinline |
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| body | --uriencoded--$$ \small C_a=\frac%7BP_u%7D%7B\phi_cP_y%7D \; \; (LRFD) $$ |
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|
| Mathinline |
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| body | --uriencoded--$$ \small C_a=\frac%7B\Omega_c P_a%7D%7BP_y%7D \; \; (ASD) $$ |
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|
| Mathinline |
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| body | $$ \small P_y=R_yF_yA_g $$ |
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|
|  Image Added |
Webs of built-up box sections used as EBF links | h/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.67\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 1.75\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Webs of H-Pile sections | h/tw | not applicable | | Mathinline |
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| body | --uriencoded--$$ \normalsize 1.57\sqrt%7B\frac%7BE%7D%7BR_yF_y%7D%7D $$ |
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|
|  Image Added |
Walls of round HSS | D/t | | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.053\frac%7BE%7D%7BR_yF_y%7D $$ |
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|
| | Mathinline |
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| body | --uriencoded--$$ \normalsize 0.062\frac%7BE%7D%7BR_yF_y%7D $$ |
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|
|  Image Added |
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