预应力FRP加固受弯构件剥离应力分析

探讨预应力FRP加固混凝土结构的优点,提出通过施加预应力、降低粘结层刚度,使FRP的强度得到充分利用,改善构件的结构性能,提高结构加固的效率。本文在相应假定的基础上,建立界面的剥离应力微分方程,并引入了预应力条件下截面的In和x0的计算方法,给出了剥离应力的函数表达式,从而得出:对FRP施加预应力、降低粘结层刚度将明显减小剥离应力,可推迟甚至避免发生剥离破坏。

Analysis of Debonding Stress of Prestessed FRP-strengthened Beams

This article discusses the advantages of prestressed FRP-strengthened concrete structures and proposes that the methods of exerting prestress on FRP and reducing the rigidity of coherence layer enable the intensity of FRP to be fully used can improve the structural performance of the structure members,and enhance the efficiency of the structural reinforcement.On the basis of corresponding hypotheses,this article infers the differential equation of debonding stress,introduces the I_n and x_0 computational method of prestressed section,and gives the function expression of the debonding stress.Finally,it is calculated that by means of the prestress on FRP and the reduction of the rigidity of coherence layer,the debonding stress will be decreased obviously and the debonding failure will be postponed,and even avoided.