内置型钢桁架高强混凝土低剪力墙抗震性能研究  

Seismic behavior of low-rise high strength reinforced concrete wall with concealed steel truss

作　　者：伍云天[1,2] 周忠亮[2] 李立仁[2] 李炎[3] 

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [2]重庆大学土木工程学院,重庆400045 [3]中国建筑第二工程局有限公司,湖南长沙410000

出　　处：《建筑结构学报》2015年第6期53-60,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51108484)

摘　　要：通过对3个1/4缩尺、剪跨比为1.0的内置型钢桁架高强混凝土低剪力墙试件进行拟静力试验,研究其在低周反复荷载作用下的抗震性能。分析了不同暗柱型钢类型及暗支撑型钢配钢率对试件破坏形态、滞回曲线、骨架曲线、位移延性以及侧向刚度退化的影响。采用有限元软件ABAQUS对试件进行数值模拟。结果表明:内置型钢桁架高强混凝土低剪力墙试件具有弯曲破坏的特征,试件的位移延性与普通高强混凝土低剪力墙相比有明显提高、后期侧向刚度退化曲线更加平缓,说明内置型钢桁架提高其抗震性能的有效性;暗柱型钢及暗支撑型钢配钢率对试件的受剪承载力影响不明显,但对位移延性以及滞回耗能影响显著,当暗支撑相同时,暗柱型钢配钢率提高,试件的受剪承载力有所提高;暗柱型钢相同时,暗支撑型钢配钢率提高能显著提高试件的位移延性和滞回耗能能力。ABAQUS数值模拟结果与试验结果吻合较好。Considering the effects of different steel ratio of concealed steel columns and diagonal braces,seismic behavior of three 1 /4 scaled low-rise high strength reinforced concrete walls with concealed steel truss, were investigated through quasi-static tests. Numerical analysis by the finite element software ABAQUS was conducted. By studying experiment phenomena, including the failure pattern, hysteresis loops, skeleton curves, displacement ductility and stiffness degradation process,it is indicated that the specimens mainly fail in flexure. The displacement ductility can be improved significantly,and the post-yield stiffness degradation is smoother compared with the normal high strength concrete low-rise shear wall without concealed steel truss,implying the effectiveness of the concealed truss. As the steel ratio of concealed braces is raised,the maximum horizontal bearing capacity is increased slightly,while the displacement ductility and hysteretic energy dissipation capacity can be improved significantly. Numerical simulation results of ABAQUS agreed well with experiment results.

关 键 词：高强混凝土低剪力墙 型钢桁架 拟静力试验 抗震性能 

分 类 号：TU398.2[建筑科学—结构工程] TU352.11