Abstract
Although research into the application of externally bonded fiber-reinforced polymers (FRPs) to reinforce concrete slabs has concentrated on improving flexural capacity, FRP laminates also offer the potential to improve the shear capacity of reinforced concrete slabs. This paper describes an innovative approach for increasing the two-way shear strength of concrete slabs with carbon FRP laminates. A process analogous to stitching is used to retrofit concrete slabs with FRP strands. An experimental study was carried out on 28 square, isotropic two-way slab specimens simulating conditions in the vicinity of an interior square column in a continuous flat plate structure. Parameters such as the concrete strength, flexural capacity, and shear reinforcement arrangement were investigated, and the applicability of existing CSA A23.3-04 and ACI 318-05 standard specifications for punching shear resistance were examined. Results from the tests show that marked increases in the punching shear capacity and ductility (over 80 and 700%, respectively) can be achieved with CFRP retrofitting of slabs. The proposed procedure appears to be technically superior, easier to implement and produces more durable structures that traditional strengthening techniques. Although the procedure was tested for retrofitting of existing slabs, the results are equally applicable to new structures.
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