约束砌体结构试验研究及延性影响分析  

Study of Seismic Performance and Displacement Ductility of Confined Masonry Structures

作　　者：苏启旺[1] 许子宜[1] 宋吉荣[1] 李勇志 吴昊[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2017年第6期1164-1172,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51308473;51408502)

摘　　要：为探讨砌体结构的破坏特性及延性影响,设计和制作1∶2缩尺结构模型进行了拟静力试验,研究了多次往复循环静力作用下结构的受力特点、构造柱受力钢筋应变发展及骨架曲线特征;采用数值分析技术对模型试验结果进行了对比,验证了数值计算参数设置的合理性;定量分析了结构楼层数、楼层内构造柱数量、楼层内墙体数量以及楼层高度等变化与位移延性系数变化之间的关系,给出了定量的函数表达式.研究结果表明:构造柱-圈梁能够与墙体发生相同的变形机制,能共同约束和限制墙体变形及裂缝发展,结构展现明显的延性特征;增加墙体数量可提高砌体结构抗侧承载力,但不能增大结构位移延性;增加构造柱数量可显著增大结构位移延性,当构造柱含量增加1倍时,位移延性系数可增加3倍.In order to research seismic behaviours of masonry structures confined by tie-columns and beams, a 1＊2 pseudo-static model test of a two-storied brick masonry building with confined elements was conducted. The mechanical characteristics, the strain development of tensioned bars in the constructional columns, and the structural skeleton curve were studied in the test. The results of the model test were compared using a numerical analysis technique, and the rationality of the parameter settings was verified. In addition, a quantitative analysis of the relationship between the change in the displacement ductility coefficient and the increment of many factors of influence including the number of stories, floor height, brick walls, and constructional columns on the floors, and the quantitative expression of the function are presented. The analysis results show that tie-columns, beams, and walls can undergo the same deformation mechanism, constraint and limit deformation, and the development of cracks. The damage to masonry structures can exhibit ductile characteristics. Increasing the number of walls can improve the lateral bearing capacity of the structures, but it cannot increase thedisplacement ductility, whereas increasing the number of tie-columns can significantly increase the displacement ductility. The displacement ductility coefficient can be increased by three times the increase in the number of constructional columns.

关 键 词：砌体结构 低周往复加载 破坏特征 结构位移延性 数值模拟 

分 类 号：TU365.3[建筑科学—结构工程]