Flexural capacity of bending members is calculated by the AEC|BOLT BIM Cloud library Cloud Library object designated for Building Design Suite.
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Whitney’s approach is widely accepted and also referred by ACI 318-14. (See 22.2.2.4 and R22.2.2.4 of the ACI 318-14 Specification)
Go to library object :https://building.openbrim.org/objid20epnxb0f2a5tyw07ib10b.libobj