Experimental and Computational Investigation of Hybrid FRP Bonded-Reinforced Concrete Beams under Cyclic Loading

Abstract

Although several experimental and numerical studies have been carried out on the shear capacity of RC beams retrofitted by carbon or glass fibre-reinforced polymers, there has been little work on hybrid FRP sheet applications, particularly under cyclic loading. In the present research, five RC beams were constructed, and four of which were retrofitted using various schemes of FRP sheets. All beams were subjected to quasi-static cyclic loading in an attempt to represent the effect repetitive loading. The ultimate load, and deflection response at mid-span of the beams were measured and compared with predictions of a computational model based on finite element analysis. Experimental results demonstrated that hybrid applications of FRP sheets can improve the shear performance of retrofitted RC beams and increase the ultimate strain of the FRP sheets at failure. The results of the computational model were in reasonable agreement with the corresponding experimental results.

Evaluation of the Flexural Performance of the Mono and Hybrid FRP Strengthened RC Beams: Static and Cyclic Loads

“…It was identified that all the test beams exhibit slow and steady as well as similar trend until failure. The beams strengthened using FRP sheets sustained larger deformation than the beam B1 [18]. The beams strengthened using GFRP sheets sustained much higher deformation than the hybrid FRP laminated beams.…”

“…By using hybrid FRP sheets, one can access the benefits of two or more fibres. Some researchers studied the behaviour of externally strengthened RC beams with HFRP sheets under flexure [7,[12][13][14][15][16], CFRP and GFRP laminates under cyclic loading condition [8,9,[17][18][19][20]. https://doi.org/10.37358/MP.…”