玻璃纤维筋增强混凝土梁抗弯承载力试验研究

Experimental research on flexural capacity of concrete beams reinforced with GFRP bars

根据5根玻璃纤维筋增强混凝土梁的抗弯承载力试验,得出截面应变符合平截面假定的结论,其破坏模式有受拉破坏和受压破坏两种,分别由玻璃纤维筋断裂和受压区混凝土压碎控制;由荷载-应变曲线和荷载-挠度曲线可以看出,玻璃纤维筋配筋率的增加,可以在一定程度上提高抗弯承载力和降低截面挠度,因此合理地控制玻璃纤维筋的配筋率是设计中必须考虑的重要因素之一.此外,玻璃纤维筋表面喷砂可有效地提高玻璃纤维筋与混凝土的粘结力,有助于应力的传递和重分布.

Based on the flexural capacity experiments of 5 concrete beams reinforced with glass fiber reiforced plastic（GFRP） bars,it is concluded that the section strain at loading obeys plane section assumption.The failure mode is tension failure or compression failure which is governed by GFRP rupture or concrete crushing respectively.According to the load-stress curve and the load-deflection curve,the flexural capacity would increase and the deflection decrease moderately with the increasing of GFRP reinforcement ratio;so the reasonable control of GFRP reinforcement ratio is the one of important considerations for the design.Sand blasting surface treatment on GFRP bars would increase the bonding force effectively between GFRP bars and concrete;it is beneficial to the stress transmission and redistribution.