Definition of Punching Shear?
The punching shear refers to a failure system that occurs in structural members like slabs and foundation with presence of shear under the action of concentrated loads.
The action of concentrated loads remains on a minor area in the structural members. Normally, this reaction is the one from the column that behaves against the slab.
Therefore, the ultimate load capacity of the structure is decreased underneath the flexural capacity with the action of shear. The punching shear is not so important with regards to beam shear.
Calculations in Punching Shear: If it is required to compute punching shear for the design, it is dependent on the punching shear force that is punching against the density of the slab or foundation. It can occur only if shear remains separately in the system. It becomes impossible, if any form of moment is in the pedestal or the column.
1. Proper examinations should be done to ensure that the concrete is very durable.
2. If there is not sufficient strength for the concrete, verify whether the amount of supplied reinforcement is proper.
3. If it is improper, it will be better to adjust the form of the structure.
1. Raise the depth of the slab
2. Expand the column size
3. Assimilation of drop panels
4. Creation of Flared column heads
5. Other foreign codes are recommended to practice other liberal designs