Problem of Punching Shear
Flat slab construction is not ideal from the structural point of view, due to stress concentration at points of support, such as columns. In reinforced concrete design, the problem is a matter of preventing brittle punching shear failure.
Reinforcing against shear failure is traditionally accomplished by providing reinforcement either at an angle or laterally to the main flexural reinforcement.
In thin structural elements, such as slabs, anchoring short lengths of shear reinforcement can not be placed above the top layer of flexural reinforcement without reducing either the durability, or efficiency of the flexural reinforcement. In addition, there is the practical problem of supporting shear reinforcement during the construction stages.
Reinforcing against shear failure is traditionally accomplished by providing reinforcement either at an angle or laterally to the main flexural reinforcement.
In thin structural elements, such as slabs, anchoring short lengths of shear reinforcement can not be placed above the top layer of flexural reinforcement without reducing either the durability, or efficiency of the flexural reinforcement. In addition, there is the practical problem of supporting shear reinforcement during the construction stages.
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