汶川地震都江堰市填充墙震害分析

Infill damage assessment of Dujiangyan City subjected to Wenchuan earthquake

统计分析了汶川地震中都江堰市钢筋混凝土框架结构填充墙的震害情况,通过对比主体结构与填充墙的震害并参照主体结构的抗震设防目标研究了填充墙自身的抗震性能.首先,统计分析了都江堰市钢筋混凝土框架结构主体结构的震害情况,结果表明主体结构满足我国"三水准"抗震设防目标;然后,将主体结构的地震反应划分为弹性反应和非线性反应两种,对比了这两种状况下填充墙与主体结构的震害,统计结果表明在这两种情况下填充墙的震害都明显高于主体结构,尤其是主体结构反应为弹性反应时,填充墙分别出现了15%和17%的严重开裂和倒塌;最后,探讨了填充墙构造措施对其抗震性能的影响,发现其现有构造措施不能满足地震作用下保持平面内完整性的作用,存在危及人员生命安全的隐患.本研究将为进一步研究填充墙地震破坏机理及其加固方法奠定基础.

The seismic damage performance of the infills of reinforced concrete （RC） frame in Dujiangyan City subjected to Wenchuan earthquake is evaluated by comparing that of the primary structures and referring to the target of aseismic fortifier for primary structures. Firstly, seismic performances of the primary RC frame structures were analyzed. Basically, it meets the ＂three-level＂ requirement of the extant Chinese seismic code. Then, seismic response of the primary structures is divided into the linear and nonlinear ones according to the evaluation results. It is found that the damage level of the infills is more severe than that of their primary structures. It is noted that in the cases when the primary structures are in linear state, 15 % and 17 % of the infills show the severe cracks and collapse. Finally, the seismic configuration of the infills is discussed in terms of its influence on the seismic performance of the infills, and the evaluation results show that the seismic configuration fails to guarantee the infills＇ in-plane integrity. Risks on human life remain. The work conducted will form the foundation for the subsequent researches on the damage mechanism of infills and its strengthening methods.