Abstract
This study presents the behaviour of punching shear in waffle slabs at slab–column joints subjected to concentric loading. Although it was observed that waffle slabs are very similar to that of flat slabs, the shear capacity is relatively reduced because some of the potential surfaces are lost when it extends into waffle section. The current IS code of practice does not consider the punching shear mechanism of waffle slabs. For the different sizes of waffle slab a square column size of 100 × 100 mm is considered for the designed slab size of 1200 × 1200 mm. Waffle slabs of different sizes are created by increasing the depth of slab by 20%, width of the rib by 25% and also increasing the solid section. The experimental results were compared with theoretical values from IS code. The comparison of the test results reveals that waffle slab gives more strength than conventional slab. The comparison has been made for the waffle slab of different sizes; slab provided with more depth and thickness of ribs gives extra strength to the structure against punching shear and the stiffness of the slab is substantially improved in the case of an increase in the rib size.
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The authors wish to thank SRM University, Kattankulathur, for providing all the facilities in carrying out the research.
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Arunkumar, C., Saketh, K., Srinivasa senthil, S. et al. Behaviour of punching shear in normal RC slab and waffle slab. Asian J Civ Eng 19, 27–33 (2018). https://doi.org/10.1007/s42107-018-0003-x
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DOI: https://doi.org/10.1007/s42107-018-0003-x