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ANALYTICAL STUDY OF PUNCHING SHEAR ON WAFFLE SLAB WITH DIFFERENT RIB SIZES

Abstract

This study presents the information of behaviour punching shear in waffle slabs at slabcolumn joint subjected to concentric punching shear. Although it was observedthat waffle slabs are very similar to that of flat slabs, the shear capacity is relatively reduced because some of the potential surfaces is lost when it extends into waffle section. The current IS code of practice do not consider the punching shear mechanism of waffle slabs. The analytical part is done using Finite Element software ANSYS, by applying the concentric load at the slab-column joint on waffle slabs, waffle slabs of different sizes and comparing the analytical results with normal RC slab. Waffle slabs of different sizes are created by increasing the depth of slab by 20%, width of the rib by 25% and one by increasing solid section. The comparison of the test results with the RC slab reveals that waffle slab gives more strength and when comparing between the waffle slab models of different sizes, providing more depth in slab and thickness of ribs gives extra strength to the structure against punching shear.

K. SAKETH, C. ARUNKUMAR AND S. SRINIVASASENTHIL

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