摘要
为研究古建筑木结构的动力特性以及抗震性能,获取建筑自身以及内部文物保护的参考依据,以故宫雨花阁为分析对象,进行环境微振动测试,并利用软件SAP2000建立结构有限元模型。经现场测试以及模态分析,得到了雨花阁的主要频率和振型;并通过输入不同地震波(加速度峰值0.4g),获得了典型节点的地震响应曲线和各层动力放大系数。结果表明:雨花阁的一阶和二阶频率为1.34Hz和1.44Hz,振动形式为两个水平方向平动,与场地的卓越周期1.5Hz较为接近;在8度罕遇地震作用下,结构产生的地震响应较剧烈;顶层南北向的动力放大系数平均可达到2.7,因此内部文物须采取更高标准的加固措施。
Yuhua Pavilion in the Forbidden City was taken as the analysis object to study the dynamic characteristics and seismic performance of the ancient wooden structures,and to obtain the analysis basis for the buildings and their internal cultural relics.The environmental micro-vibration test was carried out,and the finite element model was established by using the software SAP2000.The main frequencies and modes of Yuhua Pavilion were obtained based on the on-site testing and related modal analysis.Three different ground motions(the peak acceleration is 0.4g for each)were applied to the model,and the seismic responses and dynamic magnification factors were obtained.The results show that the first two vibration modes are in the two translational directions,and the correspondent frequencies are 1.34Hz and 1.44Hz,respectively,which are close to the predominant frequency of the site(1.5Hz).Under the rare earthquake of the intensity 8,the seismic response of the structure is fairly intense,and the dynamic magnification factor of the top floor reaches 2.7 on average,which indicates that the internal cultural relics should be protected with higher reinforcement standards.
作者
赵守江
杨永强
戴君武
ZHAO Shoujiang;YANG Yongqiang;DAI Junwu(Palace Museum,Beijing 100009,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《世界地震工程》
CSCD
北大核心
2020年第1期85-92,共8页
World Earthquake Engineering
基金
故宫博物院科研基金资助项目(KTYXD2016-15)
关键词
雨花阁
地震响应
动力放大系数
木结构
Yuhua Pavilion
seismic response
dynamic magnification factor
wooden structure
