How does ideCAD control intermediate moment frame requirements according to AISC 341-16?
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IMF members are automatically designed as2a. Moderately Ductile Members per AISC 341-16 with ideCAD in accordance with AISC 341-16 E2.
Stability Bracing of Beams
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.
Members
Basic Requirements
Intermediate moment frames that moderate ductility level are load-bearing systems in which the beams have the ability to perform the shear zone of the beam-column joints to a limited amount of nonlinear deformation under earthquake effects.
Beam and column members should provide the requirements for moderately ductile members according to Table D1.1.
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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
|
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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|
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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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|
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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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Limiting Width-to-Thickness Ratios for Compression Elements for Moderately Ductile Members per AISC 341-16 with ideCAD -
Stability Bracing for Columns and Beams for IMF per AISC 341-16 with ideCAD -
Column and Beam Design for IMF per AISC 341-16 with ideCAD -
Column-Beam Moment Ratio Check for IMF per AISC 341-16 with ideCAD -
Beam-to-Column Connection Requirements for IMF per AISC 341-16 with ideCAD
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