酸雨腐蚀砖墙抗震性能试验及恢复力模型研究

Experiment and restoring force model research on seismic behavior of brick walls affected by acid rain corrosion

为了研究一般大气环境下酸雨作用对砌体结构抗震性能的影响,以4榀相同特性的砖墙作为研究对象,进行了酸雨模拟加速腐蚀试验和低周反复荷载试验,考察了砖墙的抗震性能随着酸雨腐蚀循环次数增加的退化现象,得到了砖墙的荷载-位移滞回曲线。通过对比各腐蚀循环次数下的试验数据,分析并建立了砖墙构件性能的退化规律。基于Ibarra-Krawinkler滞回模型建立了不同酸雨腐蚀循环次数下砖墙的退化恢复力模型,并利用OpenSees进行模型验证。结果表明该恢复力模型能够准确的描述酸雨腐蚀下砖墙构件在反复荷载作用下材料的非线性,为酸雨环境下砌体结构地震反应分析奠定基础。

In order to investigate the effect of the acid rain in atmospheric environment on the seismic behavior of masonry structure, the acid rain accelerated corrosion test and low-frequency cyclic loading test were conducted on 4 same specimens in this work. The results show that the seismic behavior of masonry walls decrease with the increase of corrosion cycles. And the load-displacement hysteretic curves of masonry walls were obtained. Based on the comparison of test data under different corrosion cycles, the behavior degeneration rule of brick walls was analyzed and built. The degeneration restoring force models of brick walls under different corrosion cycles were developed based on the Ibarra- Krawinkler model, and then OpenSees was used to verify the restoring force models. The results show that the proposed restoring force model is capable of representing the material nonlinearity of brick walls affected by acid rain corrosion and cyclic loading. The research may be helpful for the seismic analysis of masonry structure affected by acid rain environment.