冻融环境下砖砌体组合墙的抗震性能试验

发布时间：2018-01-19 01:18

本文关键词： 冻融环境约束砖砌体组合墙拟静力试验抗震性能受剪承载力　出处：《振动与冲击》2017年17期 　论文类型：期刊论文

【摘要】：为研究冻融大气环境下构造柱-圈梁约束砖砌体墙的抗震性能,利用气候模拟实验室对4片组合单墙片和4片组合双墙片试件进行了加速冻融试验,进而对其进行了拟静力加载试验。试验结果表明:试件在低周反复荷载作用下均表现为剪切破坏,冻融环境对砖砌体组合墙的破坏形态有一定影响;随着冻融循环次数的增加,试件的开裂荷载和极限荷载不断降低,刚度及耗能能力逐渐退化,而开裂位移和极限位移逐渐增加;冻融循环次数相同时,组合双墙片的承载能力、变形能力和耗能能力均高于组合单墙片,其滞回曲线更加饱满,延性系数约为组合单墙片的1.2倍,刚度退化速率明显降低,表明在冻融环境下设置多道构造柱可有效提高砖砌体组合墙的抗震性能。建立了考虑冻融循环作用次数的砖砌体组合墙受剪承载力公式,且计算结果与试验结果吻合较好。
[Abstract]:In order to study the seismic behavior of brick masonry wall confined by column and ring beam in freeze-thaw atmosphere, the accelerated freeze-thaw test was carried out on four pieces of composite single wall and four pieces of composite double wall in the climate simulation laboratory. The results show that the specimens are subjected to shear failure under low cyclic cyclic loading, and the freeze-thaw environment has a certain effect on the failure pattern of brick masonry composite wall. With the increase of freeze-thaw cycles, the cracking load and ultimate load of the specimen decrease, the stiffness and energy dissipation ability gradually degenerate, and the crack displacement and limit displacement increase gradually. When the number of freeze-thaw cycles is the same, the load-carrying capacity, deformation capacity and energy dissipation capacity of the composite double-wall sheet are higher than that of the combined single-wall sheet, and the hysteretic curve is fuller, and the ductility coefficient is about 1.2 times of that of the combined single-wall sheet. The rate of stiffness degradation is obviously reduced. It is shown that the seismic performance of brick masonry composite wall can be improved effectively by setting up multiple structural columns in freeze-thaw environment. The shear bearing capacity formula of brick masonry composite wall considering the number of freeze-thaw cycles is established. The calculated results are in good agreement with the experimental results.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划(2013BAJ08B03) 教育部高等学校博士学科点专项科研基金(20136120110003) 陕西省科研项目(2012K12-03-01;2011KTCQ03-05;2013JC16)
【分类号】：TU352.11;TU364
【正文快照】： 砌体结构因取材方便、造价低廉、施工工艺简单等优点而广泛应用于我国农村及经济欠发达地区。砌体结构在服役期间受所处环境、构件施工缺陷以及其它人为因素等多因素耦合作用,结构的力学性能和抗震性能发生不同程度的劣化。而对于我国三北地区以及世界上其他寒冷地区,冻融循环

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