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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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12.5.2 Moment
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Mn is determined according to 22.3 as nominal flexural strength Mn is calculated as shown below. Detailed information: Flexural Strength
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and axial force
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.
12.5.3 Shear
Vn is determined according to 22.5. Nominal one-way shear strength at a section, Vn, is calculated by eq. 22.5.1.1.
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The shear strength is based on an average shear stress over the effective cross section, bwd. Therefore dimensions of the cross-section should be satisfy ACI Eq. (22.5.1.2). Detailed information: One-Way Shear Strength
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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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