How does ideCAD control Width-to-Thickness Ratios for special concentrically braced frames according to AISC 341-16?
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Column, beam and brace members of frames, that resists high ductility level loads are automatically controlled and reported according to Table D1.1.
The structural frame members, such as columns, beams, and braces with high ductility level, are controlled according to Table D1.1 and reported.
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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 |
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λhd
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λmd
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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 |
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Flanges of H-pile sections per Section D4 |
b/t |
not applicable |
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Stems of tees |
d/t |
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Walls of rectangular HSS used as diagonal braces |
b/t |
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Flanges of boxed I-shaped sections |
b/t |
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Side plates of boxed I-shaped sections and walls of built-up box shapes used as diagonal braces |
h/t |
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Flanges of built up box shapes used as link beams |
b/t |
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Webs of rolled or built-up I shaped sections and channels used as diagonal braces |
hw/t |
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Where used in beams or columns as flanges in uniform compression due to axial, flexure, or combined axial and flexure:
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b/t
h/t |
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Where used in beams, columns, or links, as webs in flexure, or combined axial and flexure:
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h/tw
h/t
h/t |
For Ca ≤ 0.114
For Ca > 0.114
where
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For Ca ≤ 0.114
For Ca > 0.114
where
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Webs of built-up box sections used as EBF links |
h/t |
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Webs of H-Pile sections |
h/tw |
not applicable |
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Walls of round HSS |
D/t |
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