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How does ideCAD design two-way joist systems (waffle slabs) according to ACI 318-19?

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Nonprestressed two-way joist systems is are designed according to ACI 8.8.

General

• Spaced ribs and a top slab are parts of waffle slabs.

• Minimum width of ribs is 4 in.

• Overall The overall depth of ribs do does not exceed 3.5 times the minimum width.

• Clear spacing between ribs is a maximum 30 in.

• At least one bottom bar in each joist are is continued and anchored to develop f_y at the face of supports.

• To provide slab moment strength requirements, considering Considering load concentrations, a reinforcement area perpendicular to the ribs is designed to provide slab moment strength requirements and is at least the shrinkage and temperature reinforcement area according to 24.4.

Joist systems with structural fillers

• Minimum slab thickness over fillers is the greater of one-twelfth the clear distance between ribs and 1.5 in.

Joist systems with other fillers

• Minimum slab thickness is the greater of one-twelfth the clear distance between ribs and 2 in., if fillers do not complying comply with 8.8.2.1 or removable forms are used.

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