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To design diaphragms for each applicable factored load combination, it’s controlled automatically whether it’s satisfied ΦSn ≥ U. Interaction between load effects are considered. Φ is automatically designed according to Strength Reduction Factors.
ΦMn ≥ Mu
ΦVn ≥ Vu
Design strengths of diaphragms idealized with finite-element model are determined in accordance with Chapter 22. Detailed information: Sectional Strength. Nonuniform shear distributions is considered in design for shear.
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It’s applied to diaphragm in-plane shear strength. Φ is obtained automatically as 0.75. For a diaphragm that is entirely cast-in-place, Vn is calculated according to Eq. (12.5.3.3).
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Cross-sectional dimensions is selected to satisfy Eq. 12.5.3.4, for a diaphragm that is entirely cast-in-place where the value of √f′c used to calculate Vn is not exceed 100 psi.
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For any diaphragm, where shear is transferred from the diaphragm to a collector, or from the diaphragm or collector to a vertical element of the lateral-force-resisting system, (a) or (b) are applied:
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