FRP筋-钢筋混杂配筋混凝土梁受弯性能试验研究与有限元分析

Experimental study and finite element analysis on flexural behavior of concrete beams hybrid reinforced with FRP bars and steel bars

通过FRP筋-钢筋混杂配筋混凝土梁受弯性能试验,分析混杂配筋梁的受弯性能.混杂配筋混凝土梁的荷载-挠度曲线分为3个阶段,混凝土梁的开裂荷载和钢筋屈服荷载为3个阶段的分界点;混杂配筋混凝土梁的极限承载能力高于普通混凝土梁.按等弹性模量换算名义配筋率ρ_(2)相同时,A_(f)/A_(s)增大;按等强度换算名义ρ_(1)增大,混凝土开裂后梁的刚度增加,钢筋屈服后梁的塑性变形能力提高,对梁破坏有更明显的预警,且极限承载能力和挠度均有所增加;采用ABAQUS有限元软件可以准确地模拟FRP筋-钢筋混杂配筋混凝土梁受弯性能.

The flexural behavior of concrete beams hybrid reinforced with FRP bars and steel bars are analyzed through the bending tests.The load-deflection curve of hybrid reinforced concrete beams is three-stage,and the cracking load and yield load are the three-stage boundary points.The ultimate bearing capacity of hybrid reinforced concrete beams is higher than that of ordinary concrete beams.As the same reinforcing ratio equivalent elastic modulus,reinforcing ratio equivalent strength increase with Af/As,the rigidity of cracked concrete beam increases,and the plastic deformation capacity increase after the steel bar yield,which provides a more obvious warning.The ultimate bearing capacity and corresponding deflection under maximum load increase.The bending behavior of reinforced concrete beams hybrid reinforced with FRP bar and steel bar can be accurately simulated by ABAQUS finite element software.