中国古代木结构有限元动力分析

DYNAMIC ANALYSIS FOR THE ANCIENT SUPERSTRUCTURE OF THE EAST CITY GATE OF XI'AN BY FEM

通过对我国古建筑木结构的结构特性研究，提出了将榫卯和斗拱简化为变刚性连接，用三维动力弹塑性有限元分析，得出了我国古建筑木结构的典型代表西安东门城楼的固有频率、振型。在ElCentro波作用下分析给出了轴力、加速度和位移等的时程响应曲线，讨论了变刚度单元的刚度系数的影响，为古建筑研究提供了一种新的分析模型。

The three dimentional, dynamic and elastoplastic analysis for the structure of the East City Gate of Xi'an, which is one of the famous ancient wooden structure in china, has been studied by FEM in this paper. It is suggested that the joint with mortise and tenon, and 'dougong ' to be simplified as the connection with variable rigidity.The natural frequency, vibration mode as well as the time-history response curves of axial force, acceleration and displacement under the action of El Centro wave are thus obtained.The induence of the rigid coefficient on the element of variable rigidity are discussed. All the data may be valuable for studying ancient building.