水平地震作用下大式带斗栱木结构古建筑的抗倒塌性能分析

Analysis of anti-collapse performance of ancient timber frame buildings of grand style with Dou-gong under horizontal earthquake

基于根据宋代《营造法式》制作的某单层单开间殿堂式木结构振动台模型,建立了考虑柱础滑移隔震、榫卯半刚性连接及斗栱减震性能的空间杆系有限元模型。通过模型的数值计算值与振动台实测数据之间的对比分析,验证了建模方法的正确性。提出了柱脚滑移倒塌的相对位移判定准则及柱架层间倒塌的最大层间位移角判定准则,并采用增量动力分析(IDA)方法对这两种倒塌机制进行研究。结果表明:木结构古建筑在普通地震波作用下不易出现柱脚滑移倒塌;层间倒塌为长周期地震波作用下最易出现的倒塌机制;相对于普通地震波而言,木结构古建筑受长周期地震波作用的影响更大。

Based on the model of a single-story place house made according to Ying Zao Fa Shi of the Song Dynasty,we have developed a 3D beam-spring finite element model which takes into account the sliding of column root,the semi-rigid connection of mortise-tenon joints and shock isolation of Dou-gong.Using this model,the seismic analysis results were in good agreement with the experimental result made in a shaking table test.The criteria for determining the relative displacement of the column root sliding and the maximum story drift angle were proposed and the two kinds of mechanisms were studied using incremental dynamic analysis(IDA)method.The results show that the wooden structure of the ancient building was not prone to collapse due to column root sliding under ordinary seismic waves,but that story collapse was the mechanism most likely to be involved under long-period seismic waves.Compared with ordinary seismic waves,ancient wooden buildings were more affected by long-period seismic waves.