I have a suspended 7" slab which has a 2" cement mortar finish. My question is if I can use the entire depth when calculating my effective depth d. The center of the bottom reinforcement is 7/16" from the bottom. So, my question is if my d in the punching shear equations can be 9" - 7/16", or must I use only the slab thickness (7" - 7/16")? Thank you in advance.
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