What is punching shear and did it cause the Champlain towers collapse in Surfside Florida?

Although the definitive cause of the Champlain Towers collapse has not been determined, it was likely related to a punching shear issue. But what exactly is punching shear? In this video, Greg explains punching shear and how it could lead to a building collapse.

Punching shear is a structural engineering term that refers to the phenomenon where a concentrated load (such as from a column or pedestal) causes a slab or foundation to fail by punching through the material around it. This failure occurs due to insufficient reinforcement or inadequate depth of the slab or footing to resist the vertical shear stresses concentrated around the load. Design considerations for punching shear involve ensuring sufficient reinforcement around the column or pedestal to prevent such failure, typically through the use of shear reinforcement like stirrups or shear studs in reinforced concrete structures.

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