Abstract
<p>This paper presents the test results on 5 flat slab-column connection specimens with Ultra High Performance Fiber-Reinforced Concrete (UHPFRC) overlay to investigate the retrofitting effect of UHPFRC overlay on the punching shear capacity. The test parameters were the thickness of the UHPFRC overlay and the reinforcement ratio in the overlay. All specimens failed in punching shear mode with softening failure modes. The test results showed the increases in global punching shear resistance up to 82% and structural rigidity by a thin layer of UHPFRC over the reinforced concrete (RC) substrates. Furthermore, the cracking patterns in the composite systems by two failure modes control the ultimate strength: 1) diagonal shear failure in RC section and 2) debonding failure at the interface.</p>
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