中央电视塔结构模型的空间地震响应与分析

THE SPACIAL SEISMIC RESPONSES AND ANALYSIS ON THE STRUCTUREAL MODEL OF THE CENTRAL TV TOWER

将塔结构模型沿高度离散为有限元环，节圆处连接集中质量．利用旋转壳理论推导单元刚度与质量矩阵．由子空间迭代法求出塔结构模型竖向与水平振动前６阶振型及频率．输入ＥＬ－Ｃｅｎｔｒｏ三向加速度波，采用时程分析法做塔结构模型空间地震响应全过程响应，最终得出各节圆处位移与内力分布．计算结果与试验结果［１］吻合良好．

The stuctural model of a TV tower is divided into finite circular elements along the height. Some points link with mass rings. The stiffness and mass matrix of the circular element is deduced according to the theory of revolutionary shell. By means of the subspace interaction method, it is solved that the front six models and frequencies of the vertical and horizontal vibration of the tower model. By inputting EL Centro seismic waves, the spaical seismic responses of the structural model are studied by the time history analysis method. At last, we get the distribution of displacements and internal forces on every point. The results of calculation are identical with the results of tests. The method can be developed in use.