Abstract
This paper presents a strengthening method used for improving the punching shear strength of flat slabs. Square internal patches of carbon fiber reinforced polymer were placed at the center of 450×450mm fresh concrete slabs, through casting, at a distance from the bottom (tension) face, producing four specimens. The dimensions of these patches were from 60×60mm to 200×200mm. The results have shown that the strengthened specimens had higher punching shear strength in comparison to the control specimen, with an increasing rate ranging from 15 to 45 %. In addition to the sensibly improved shear strength, this strengthening method is capable of changing the mode of failure from combined flexural-punching to pure punching shear failure.
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