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Diaphragms are automatically designed to resist in-plane moment and axial force according to ACI 22.3 and 22.4. Nonprestressed deformed bars, strands can be used according to ACI 20.2.1 and 20.3.1.
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The location of the nonprestressed reinforcement and mechanical connectors resisting tension due to moment is h/4 of the tension edge of the diaphragm.
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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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(a) Vn is determined according to Eq. (12.5.3.3), and cross-sectional dimensions selected to provide Eq. (12.5.3.4). Acv is determined using the thickness of the topping for noncomposite topping slab diaphragms and combined thickness of cast-in-place and precast elements for topping slab diaphragms.
(b) Vn does not exceed the value determined according to the shear-friction provisions of 22.9 considering the thickness of the topping slab above joints between precast elements in noncomposite and composite topping slab diaphragms and the reinforcement crossing the joints between the precast members.
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