砌体填充墙RC框架结构破坏模式分析及数值模拟

Analysis on failure modes and numerical simulations of masonry-infilled reinforced concrete frame structures

基于填充墙框架结构伪静力试验,包括纯框架、大跨满布填充墙框架及两跨半高布置填充墙框架试验模型,揭示填充墙对框架结构破坏模式的影响规律,并实现数值模拟。试验结果分析表明,填充墙对RC框架产生了斜压杆效应及约束效应,改变了框架结构的破坏失效模式,易导致明显的"柱铰"破坏机制。另外,采用DIANA非线性有限元分析程序,建立一种填充墙框架结构分离式微观有限元模型,通过对试验模型的非线性有限元分析,验证该模型能有效实现填充墙与RC框架间相互作用规律的模拟,并对不同砌筑材料填充墙对框架结构破坏模式的影响进行分析。

Based on the pseudo-static tests of reinforced concrete frame structures with infill panels, including pure frame model, fully infilled frame model in large span and partially infilled frame model, the influence laws of infill walls on the earthquake damage modes of frame structures were revealed, and the numerical simulations of them were achieved. The test results show that infill walls have diagonal strut and confinement effect on frame structures, so the failure modes of frame structures are changed, which easily leads to column hinge failure mechanism. In addition, based on DIANA nonlinear finite element analysis program, a kind of separate finite element micromodel was set up. Through nonlinear finite element analysis of test models, the effectiveness of this finite element model on simulating the interaction laws between infill walls and RC frames were verified, and the influences of different material masonry infill walls on the failure modes were analyzed.