部分黏结FRP加固混凝土梁抗弯性能研究

Study on flexural behavior of partially bonded FRP strengthened RC beams

为研究部分黏结FRP加固方式对加固梁延性等抗弯性能的影响,建立部分黏结FRP加固梁的有限元模型,提出等效完全黏结FRP加固梁理论,即按照总变形相等的原则将部分黏结FRP加固梁转化为等效的完全黏结FRP加固梁。数值分析结果表明:部分黏结FRP加固方式对加固梁的承载力影响不大,但随着无黏结长度的增加,梁屈服后的刚度有所下降,FRP的利用率和加固梁的延性均明显提高;等效完全黏结FRP加固梁与相应的部分黏结FRP加固试验梁抗弯性能吻合较好,利用等效完全黏结FRP加固梁理论进行部分黏结FRP加固梁的承载力和变形分析是可行的。

In order to study the effect of partially bonded FRP reinforcement method on the ductile and bending properties of strengthened beams,the finite element model of partially bonded FRP strengthened beams was established,and the theory of equivalent fully bonded FRP strengthened beams was put forward,which is based on the principle of total deformation being equal,the partially bonded FRP strengthened beam is transformed into the equivalent fully bonded FRP strengthened beam.The numerical analysis results show that the partially bonded FRP reinforcement method has little effect on the bearing capacity of the strengthened beam,but with the increase of the unbonded length,the stiffness of the beam decreases a little after yielding,and the utilization rate of FRP and the ductility of the strengthened beam are obviously improved.The bending behavior of the equivalent fully bonded FRP strengthened beam is in good agreement with that of the corresponding partially bonded FRP strengthened beam,it is feasible to analyze the bearing capacity and deformation of partially bonded FRP strengthened beams by using equivalent fully bonded FRP strengthened beam theory.