Abstract
A novel hybrid FRP-concrete sttuctural system was proposed in past study. In the study, high strength type of CFRP sheets is axially bonded on the bottom surface of the concrete core to cany tensile load while GFRP sheets with higher rupture strains are hoop-directionally wrapped to bear the shear load. The GFRP sheets also provide confinement to concrete core and delay the debonding of CFRP sheets. A minimum reinforcement ratio of steel rebars is used to control the localization and propagation of flexural cracks. In this study, a series of 4-point bending experiments were carried out to study the performances of the hybrid FRP with high modulus type of CFRP sheets, T grass fiber sheets and Dyneema fiber sheets and concrete hybrid beams. Based on the principles of strain compatibility and equihbrium, an iterative analytical model is developed to evaluate the flexural behavior of the hybrid beam specimens.
