Predicting the punching strength of conventional slab-column is very important and helpful to the designers of flab slab structures. The punching strength and shear is based physically on empirical and semi-empirical studies more than on analytical assessments. Looking for the analytical concept of aggregate interlock as a means of resisting shear.
Dear Sir,
I advice you to check Critical Shear Crack Theory (CSCT), there punching failure occurs due to the loss of aggregate interlock action along the critical shear crack, which is governed primarily by the crack opening (w) and
the crack roughness. Crack roughness depends on the aggregate size.
Dear Sir, I would like to recommend you the following book: J.C . Walraven "aggregate interlock: a theoretical and experimental analysis".
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