Damage of Ancient Buildings After Wenchuan Earthquake in China
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摘要: 为保护古建筑,以四川剑阁县觉苑寺大雄宝殿为例进行了震害分析.通过现场勘查,讨论了汶川地震作用下该古建筑的主要震害症状,建立了震前结构有限元模型.通过进行模态分析,得到了结构的基频和主振型;考虑该建筑所在地区的实际震害烈度,通过进行地震反应分析,得到了不同时刻结构的整体变形、应力响应及典型节点和单元的动力响应曲线.结果表明:大雄宝殿产生柱子歪闪等震害的主要原因为前后檐穿插枋及双步梁拔榫,从动力响应分析结果来看,结构不会出现强度破坏.Abstract: The Da-Xiong Palace in Si-Chuan province is taken as an example to study the damage of ancient buildings by Wenchuan earthquake.Typical damage characters of the structure are discussed and a finite element model is built.By modal analysis basic frequency and main modes of structure are obtained.By dynamic analysis responses of displacement and stress of the structure are obtained.Resultsshow that the main reason for incline of columns of the structure is that tenon pulled from mortise of some tenon-moritse joints between tie beams and columns,but the structure will not be destroyed for strength failure under seismic forces.
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