基于粘性理论的FRP-混凝土界面性能分析方法

Analysis method of interfaces performance for FRP-concrete based on cohesive methods

为深入研究FRP-混凝土界面剥离破坏机理,弥补试验观测手段的不足,基于9组双剪切模型试验,应用数值分析方法,将混凝土塑性损伤模型、Cohesive behavior和界面双线性粘贴-滑移模型应用到分析中,实现了混凝土损伤、FRP-混凝土界面滑移的模拟。研究结果表明：未进行深度处理的构件,其极限荷载值均偏小,FRP强度利用率最大仅为48.31%。增加FRP粘贴层数可以有效提高极限荷载,但同时FRP材料强度利用率却明显降低;本文分析方法得到的极限荷载与试验值较为接近,最大偏差在10%左右;FRP-混凝土界面开裂的深度约为1cm,损伤宽度为FRP粘贴范围的1.5~2.0倍;界面峰值应力处的滑移量约为0.5~0.7mm,极限滑移量为1.5~2.0mm。通过与实测值比较,验证了本文方法的可靠性和科学性,弥补了试验测试手段的不足。

In order to study the FRP-concrete interfacial debonding failure mechanism and make up for the inadequacy of the method of observation,the article,on the basis of 9groups double shear model test,used numerical analysis method,applied Concrete Damaged Plasticity Model,Cohesive behavior method and bilinear traction-separation model to the analysis,and implemented the simulation of concrete damage and FRP concrete interface slip.Research shows that the ultimate load values of the components without in depth processing are smaller,and the largest FRP strength utilization is only 48.31%.Increasing the number of FRP paste layers can effectively improve the ultimate load,but at the same time the utilization rate of FRP material strength decreases obviously.The ultimate load obtained by using the analysis method in this paper is closer to the test results.The maximum deviation is about 10%.FRP-concrete interface crack depth is about 1cm and the damage width is 1.5to 2.0times of FRP paste the range.The slippage at the peak stress of the interface is about 0.5to 0.7mm,while the limit sliding is 1.5mm to 2.0mm.Throughthe comparison with the measured values,the reliability and scientificity of the method in this paper is verified and it offsets the deficiency of the test method.2tabs,13 rigs,22refs.