Punching shear is a phenomenon in flat slabs caused by concentrated support reactions inducing a cone shaped perforation starting from the top surface of the slab.
Although generally preceded by flexural failure, punching shear is a brittle failure mode and the risk of progressive collapse requires a higher safety class in structural design.
This is a valuable and practical resource for understanding slab punching shear, particularly the brittle failure mechanism caused by concentrated support reactions. The calculation spreadsheet can help structural engineers assess punching shear more efficiently while reinforcing the importance of proper slab thickness, detailing, and safety considerations in flat-slab design.
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