General informations of progressive collapse
Progressive collapse of Tropicana Casino parking garage in Atlantic City, N.J., October 2003------- due to punching of flat slab.
Punching failure may take place due to :
1) unconservative design of slab-column connections,
2) slab overloading,
3) deterioration of strength of concrete and reinforcement dueto fire .
when one slab-column connections get failure in punching ,It may result in progressive failures of adjacent connections of the same floor as the load is transferred to the surrounding columns causing the adjacent connections to be heavily loaded. Also, the lower floors may fail progressively as they become unable to support the impact of slabs dropping from above.
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