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Re: precast flat slabs

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            Dear K.Khalpari,

                        ACI 318-5 Section 9.5.4, p. 116, deals with deflections of prestressed flexural members, which should help with thickness. Design is the same as for any flexural member, so limits of reinforcement are part of the design method. If top steel is required, the section is probably too thin. If shear steel is required, the section is probably too thin, or has a very large load near the support.

PCI 4th, Section 6.8, p. 6-24, discusses bearing, the “Plain Concrete” method should suffice for a flat slab.

            HTH,

            Jim Getaz