摘要
为了更好保护古建筑,以某单檐歇山古建筑模型为对象,应用已有的试验成果,采用有限元分析方法,研究其动力特性及8度多遇地震响应。采用弹簧单元模拟榫卯节点及斗拱构造,并考虑柱础为平摆浮搁,建立古建筑模型的有限元模型。通过模态分析,获得了模型的基频及主振型;通过对模型输入PGA=0.1g(x向)的水平双向地震波(x∶y=0.85∶1),获得了典型节点的位移、加速度响应曲线、典型单元的内力响应曲线,并对模型的抗震性能进行评价。结果表明:模型基频为1.34Hz,主振型以平动为主;8度多遇地震作用下,模型能保持稳定振动状态,结构的内力和变形均在容许范围内。有限元分析结果与振动台试验结果一致。本研究结果可为单檐歇山顶式古建筑在多遇地震作用下的性能评估及文物保护提供理论依据,为古建文物管理提供参考。
In order to effectively protect Chinese ancient buildings,a model of single layer gable and hip roof type is taken as an example,based on experiment results,the finite element analysis are carried out to analyze its dynamic characteristic and seismic responses under 8degree intensity of frequently occurred earthquakes.Based on hypothesizes that tenonmortise joint and bracket sets are simulated by spring elements,and column roots are of freestanding status,finite element model of the experiment model is built.By modal analysis,its basic frequency and main modes are obtained;by timehistory analysis under PGA=0.1g(x direction)of level earthquakes(x∶y=0.85∶1),displacement and acceleration response curves of typical nodes,and internal force response curves of typical elements are obtained,seismic performances of the structure are discussed.Results show that basic frequency of experiment model is 1.34 Hz,its main modes are of translation;under earthquakes of 8degree intensity of frequently occurred earthquakes,the structure vibrates steadily,whose peak displacement as well as internal force response values are within permitted scopes.Besides,the simulation results are in good agreement with those of the experiments.The results of this study can provide a theoretical basis for the performance evaluation and heritage preservation of single layer gable and hip roof type under frequent earthquakes,and provide a reference for the management of ancient buildings and relics.
作者
周乾
纪金豹
ZHOU Qian;JI Jinbao(Palace Museum,Beijing 100009,China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)
出处
《水利与建筑工程学报》
2023年第5期1-6,12,共7页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金(51878182)。
关键词
古建筑
木结构
动力特性
地震响应
单檐歇山屋顶
Chinese ancient building
timber structure
dynamic characteristics
seismic responses
single lay⁃er gable and hip roof
