祈年殿式混凝土仿古建筑模态分析

在对天坛祈年殿结构特点分析的基础上,结合有限元模态分析基本理论和ANSYS软件模态分析过程,运用通用数值分析软件Ansys11.0对天坛祈年殿式混凝土结构前五阶模态进行了计算.介于古建筑构件尺寸相对偏大,整体刚度偏大,使得结构固有频率偏大,自振周期偏小;对称结构致使结构特征周期和振型呈对称特征.根据模态分析数据和振型图对天坛祈年殿式钢筋混凝土结构动力特征进行了分析和总结,为对该类建筑的进一步动力分析提供了依据.

Modal Analysis of Antiquity QND-styled Concrete Construction

Based on the structural features of Qi Nian Dian（QND） in the Temple of Heaven and the basic theory of finite element mode analysis, and with the process of modal analysis by ANSYS software, this paper calculates the first five modes of the QND-styled concrete structures by a com- mon numerical analysis software Ansysll. 0. Owing to the large section size of components of ancient architecture, the structure features larger stiffness, larger natural frequency and smaller natural period of vibration. The symmetricity of the structure brings about the symmetricity of the features of the period of vibration and mode shapes. The structural dynamic features of the QNDstyled concrete construction are analysed and summarized based on the modal analysis data and vibration features. It serves as a basis for the further dynamic analysis of such kind of construction.