Abstract
In this study, the structural behavior of reinforced concrete flat plates shear reinforced with vertical grids made of a glass fiber reinforced polymer (GFRP) was experimentally evaluated. To examine the shear strength, experiments were performed on nine concrete slabs with different amounts and spacings of shear reinforcement. The test results indicated that the shear strength increased as the amount of shear reinforcement increased and as the spacing of the shear reinforcement decreased. The GFRP shear reinforcement changed the cracks and failure mode of the specimens from a brittle punching to flexure one. In addition, the experimental results are compared with a shear strength equation provided by different concrete design codes. This comparison demonstrates that all of the equations underestimate the shear strength of reinforced concrete flat plates shear reinforced with GFRP vertical grids. The shear strength of the equation by BS 8110 is able to calculate the punching shear strength reasonably for a concrete flat plate shear reinforced with GFRP vertical grids.
Highlights
IntroductionOwing to the weight of the flat plate that is directly delivered to a column from a slab, a large stress concentration develops around the column causing a punching shear failure
A flat plate is a structural element composed of slabs and columns without beams
The initial crack in the specimen with the glass fiber reinforced polymer (GFRP) plate reinforcement was generated near the column and cracks occurred within the critical section of the slab
Summary
Owing to the weight of the flat plate that is directly delivered to a column from a slab, a large stress concentration develops around the column causing a punching shear failure. This brittle punching failure is prompted by large shear forces and unbalanced moments transferred from the slab-column joint due to the severe horizontal displacement associated with seismic loads. Hassan et al [6] investigated the punching shear of two-way concrete slabs with a GFRP bar as a flexural reinforcement and stirrups. They conducted the tests on 10 full-scale interior slab-column specimens considering the flexural reinforcement ratio and shear reinforcement ratio and type. As a result of performing a modal linear analysis, the comparison showed a substantial equivalence between the model using the rigid floor assumption and an equivalent shell
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