How does ideCAD calculate diaphragm design strength according to ACI 318-19?
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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 is considered. Φ is automatically designed according to Strength Reduction Factors per ACI 318-19 with ideCAD.
ΦMn ≥ Mu
ΦVn ≥ Vu
Design strengths of diaphragms idealized with finite-element model are determined in accordance with Chapter 22. Detailed information: Sectional Strength per ACI 318-19 §22. Nonuniform shear distributions is are considered in the design for shear.
Moment 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, and strands can be used according to ACI 20.2.1 and 20.3.1.
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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:
(a) Vn is determined according to Eq. (12.5.3.3), and cross-sectional dimensions are selected to provide Eq. (12.5.3.4). Acv is determined using the thickness of the topping for noncomposite topping slab diaphragms and the 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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