FRP加固T形截面钢筋混凝土梁的延性系数计算方法

A Method for Calculating Ductility Coefficient of RC T-Beams Strengthened with FRP

目的研究采用FRP(纤维增强复合材料)加固钢筋混凝土T形截面梁的延性,为T形截面梁曲率延性系数计算提出一种简化方法.方法从截面曲率延性系数的定义出发,根据底贴FRP片材抗弯加固钢筋混凝土梁的几种较为常见的极限破坏形态,基于平截面假定和界面无粘结滑移等基本假定,推导了T形截面梁在达到屈服阶段和极限阶段的截面曲率计算公式,并且给出了FRP加固T形截面的截面曲率延性系数的计算公式.结果利用笔者所给出的计算公式分析的结果与国内外已有的试验实测值进行对比分析,试验值与计算值的比值平均为0.972,可以验证所给出的公式较好地吻合了试验值.结论采用笔者所提出的方法计算T形截面曲率延性系数是可行的,其公式对于抗震加固设计具有一定的参考价值.

In order to study the ductility of reinforced concrete（RC） T-beams strengthened with fiber reinforced polymer（FRP）,a brief method for calculating ductility coefficient is proposed.This paper is based on the definition of curvature ductility coefficient,plane-section assumption,assumption of no-bond-slip in the interface and other basic assumptions.According to some common ultimate failure forms of the RC beams strengthened with FRP,the formulas of calculating the section curvature of T-beams when they come to the yield state or the ultimate state are derived.The paper presents the method for calculating ductility coefficient of RC T-beams strengthened with FRP.The comparison and analysis of actual data from both foreign and domestic tests of flexural members show that the theory analysis result agrees well with the experiment result,and the average ratio between the calculated values and experimental values is 0.972.So it is practicable to use this calculation method to calculate the curvature ductility coefficient of T-beam strengthened with FRP,and these formulas can provide valuable reference for strengthening seismic design.