PVC-CFRP管钢筋混凝土梁弯矩-曲率关系分析OA

In this study,20 PVC-CFRP reinforced concrete beams are subjected to stress tests.The effects of specimen size,hoop reinforcement ratio,width and number of layers of CFRP strips,bonding method of CFRP strips,layers of CFRP sheets and shear span ratio on the damage mode and moment-curvature relationship curves of the specimens were analysed.The results indicate that,the failure of the specimen was governed by the yielding of the stirrups and bottom longitudinal reinforcement,and the CFRP strips were subsequently ruptured in tension.In the elastic stage,with the improvement of reinforcement ratio,CFRP strip width and number of layers,and longitu-dinal CFRP sheet layer,the slope of the ultimate bearing capacity and moment-curvature relationship curves of the specimens increased,and the curvature development of the specimens slowed down obviously.As the shear-to-span ratio increases,the ultimate bearing capacity of the specimens decreases and the change of the moment-curvature curve is not obvious.In addition,under the same fiber ratio condition,the effect of CFRP strip bonding method on the specimens’bearing capacity and bending moment-curvature curves is not significant.Furthermore,on the basis of the tests,considering the influence of various factors on the moment-curvature relationship of the specimens,the adjustment factor of the bending stiffness of the specimens is introduced,and the calculation model of the moment-curvature relationship of the specimens is established.