Mechanical properties of CFRP and its reinforced concrete beams

To investigate the effect of glue's adhesive on the mechanical properties of CFRP and its reinforced concrete structure mechanical behavior , the CFRP sheets and concrete beams were prefabricated , and the mechanical properties of them were investigated by the axial tension and four-point bending beams tests. The experiment compare of carbon cloth's tension strength with and without glue indicates that the epoxy resin can not only make the fiber adhesive united but also increase the tensile strength. The strain gauges were adhered on the surface of CFRP of a four-point bending concrete beam. With the electrometric method , the damage process curves of the materials were obtained. Through the mechanics analysis model and the least square method , the axis force and shear stress distributions of CFRP were analyzed , respectively. With the debonding of interface between FRP and concrete beam , the maximum value of tension stress of FRP reduces , thus a strain rebound phenomenon appears.