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Potential punching failures in the vicinity of concentrated loads have already been taken into consideration by conventional design methods.
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An analytical procedure is presented for simulating punching failure.
However, the risk of slab punching failure was not specifically studied.
During the loading process and after the punching failure the ground pressure under the punching cone body was almost uniform.
The analytical model for punching failure of reinforced concrete slabs developed by Menetrey [Menetrey P. Synthesis of punching failure in reinforced concrete. Cem Concr Comp 2002 24 497 507] is used.
The observed model failure for all the test deck slabs was punching failure.
For checking punching failure at the ultimate limit state, a verification model is given in EC2 (Fig. 1).
According to this theory, the opening of inclined crack reduces the capability of concrete under compression to resist punching failure.
A major concern for flat plates is punching failure of slab in the vicinity columns due to high stress concentration.
Thus, the excessive local deformation of slab likely poses high risk of punching failure of slab-column connections.
So it may be deduced that application of impact load has caused punching failure mechanism to the containment.
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