全填充墙钢管混凝土组合框架抗连续倒塌性能研究  

Research on progressive collapse resistance of composite frame with concrete filled steel tubular columns and full-height infill walls

作　　者：王景玄[1] 杨永 孙衍浩 Wang Jingxuan;Yang Yong;Sun Yanhao(Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学,甘肃兰州730050

出　　处：《土木工程学报》2022年第8期1-13,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(52068047,51708270);甘肃省青年科技基金(20JR5RA437)。

摘　　要：现有建筑结构的抗连续倒塌设计主要以提高失效柱上部梁构件的梁机制和悬链线机制承载力作为主要的设防目标,忽略了既有非结构构件共同承担竖向构件失效后的抗倒塌能力贡献。为研究填充墙对钢管混凝土组合框架抗连续性倒塌性能的影响,该文对拆除中柱构件后的全填充墙钢管混凝土柱-压型钢板组合梁框架剩余结构进行单调竖向静力加载,获得试件竖向荷载-位移关系曲线、整体/局部破坏模式以及构件关键部位的应变变化曲线,并与钢管混凝土组合框架倒塌试验结果进行对比分析。研究结果表明:该类结构的荷载-位移关系曲线分为四个阶段,弹性阶段、弹塑性阶段、裂缝发展阶段和破坏阶段。填充墙作用可以提高钢管混凝土组合框架的抗倒塌承载力,但结构的延性有所降低。基于试验研究结果,利用ABAQUS/Implicit建立了全填充墙钢管混凝土组合框架抗倒塌精细化有限元模型,并验证了建模方法的合理性。在此基础上,分析了不同填充墙开洞率对钢管混凝土组合框架抗倒塌承载力和破坏模式的影响,发现不同开洞率对试件的初始刚度、峰值荷载和位移延性均有一定影响,研究结果以期为该类结构的抗倒塌设计提供一定的参考。The traditional anti-progressive collapse design of the building structure mainly focuses on improving the bearing capacity of the beam mechanism and catenary mechanism for the upper beam connected failure column,while ignoring the capacity of existing non-structural members to share the redistributed internal force after the key columns were damaged.To study the progressive collapse resistance of composite frame with CFST columns and full-height infill walls under the middle column removal scenario,a 1/4-scale two-story-two-bay composite frame specimens were designed and tested.By monotonic static loading of the residual structure under the middle column removal scenario,the load-displacement relationship curves of the specimens,the global/local failure modes and the strain developments of critical locations were obtained.The experimental results show that the progressive collapse loading process mainly includes four stages,i.e.,the elastic stage,the elastic-plastic stage,the fractured development stage and the failure stage.The infill walls can increase the collapse resistance of the composite framed structure,but will reduce the ductility.Based on the test results,the refined finite element(FE)models using finite element software ABAQUS/Implicit were established to conduct the mechanism and parametric study,and to verify the rationality of the modeling method and constitutive relationships of concrete and steel.Furthermore,the progressive collapse resistance and failure modes for infill wall with different opening rates were analyzed.It is found that the opening rate has an apparent effect on the initial stiffness,peak load and displacement ductility of the specimen.The research results can provide reference for the progressive collapse resistance design of the composite frame structures.

关 键 词：钢管混凝土 填充墙 连续倒塌 试验研究 破坏特征 

分 类 号：TU398.9[建筑科学—结构工程]