Experimental study on bending performances of hybrid FRP-concrete composite T-beams
A type of hybrid fiber reinforced polymer-concrete (HFRP-RC) composite beams with high durability is designed and researched. 12 pieces of 4-point bending experiments of T-shaped beams are carried out to further study the reliability of the wet-bonding and the performances of the HFRP-RC composite beams. After the yielding of the steel bars, the HFRP-RC composite beams still have secondary stiffness, high bearing capacity and good displacement ductility. The failure modes of all of the C50 beams are fiber fracture, showing that good bond behaviors can be achieved by externally bonding the FRP onto the precast concrete (referred to as dry-bond), by applying adhesive to the FRP shuttering before the fresh concrete is cast (referred to as wet-bond), and by coating gravel on the inside surface of the FRP shuttering before the fresh concrete is placed in position. Hybridizing the basalt fiber reinforced polymer (BFRP) with the carbon fiber reinforced polymer (CFRP) can improve the ultimate strain of the latter. And the higher the ratio of the BFRP is, the higher the ultimate strain of the CFRP is. Therefore, the improvement factor of the ultimate strain value of the CFRP should be introduced when calculating the critical mixing ratio and the theoretical capacity load values of the HFRP-RC composite beams.
国家科技期刊平台
NSTL
万方数据
维普
