Hello, I created a model using dynamic explicit analysis on Abaqus for flat plate system under column loss.

The normal stresses in X-direction (S11) must be tension values at the top surface of the slab at the position of columns. This happens from the beginning to the time of 0.30 sec. 

My question is why maximum tension values of normal stresses S11 move away from the place of columns after 0.3 sec. Why?

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