【摘要】 为了探讨纤维增强复合材料(FRP)加固混凝土缺口梁的缺口高度(a0)和FRP片材长度(Lx)对破坏模式及其极限承载力的影响,对缺口梁在集中载荷作用下的内部裂纹扩展、破坏模式及极限承载力进行了数值模拟,并从极限承载力和声发射信号方面入手探讨了FRP片材对混凝土梁的加固机理.数值模拟给出了载荷-位移曲线、声发射-位移曲线和混凝土梁的破坏过程的最小主应力分布图.模拟结果与实验结果较吻合.研究结果表明,该数值模拟方法为FRP片材加固混凝土构件的力学性能和破坏机理的研究提供了一种新的方法.更多还原

【Abstract】 In this paper,the numerical simulation method was used for the simulation of expansion and 3-point bending in a fiberglass-reinforced plastics(FRP) reinforced concrete beam interior crack.The failure modes and the ultimate baring capacity which are under a concentrated load,as well as the influence of concrete beam notch height(a0) and FRP length(Lx) for the failure mode and ultimate bearing capacity were discussed.Furthermore,the influence of the mechanical properties of FRP on load capacities and acoustic emission(AE) was numerically investigated.The numerical simulation result shows the load-displacement and the AE-displacement curves;the minimum principal stress patterns of the breaking process of concrete beam are also given.The simulation results agree well with the experimental observations.Numerical modeling results show that the numerical simulation method provides a new analysis tool for studies on mechanical behavior and failure mechanisms of concrete structures.更多还原