基础隔震结构基于新抗震规范地震动随机模型的地震作用取值

对多自由度基础隔震结构的地震作用取值问题进行了系统研究。首先建立了结构运动方程，接着用实模态对上部结构进行解耦，针对所得运动方程为非对称质量与非经典阻尼矩阵的情况，再用复模态法解耦，最后采用基于新抗震规范的地震动随机模型，运用复模态时域法获得了体系的相对位移，由此便可以得到结构的地震作用取值。最后，通过一个例子来说明多层基础隔震结构的地震作用计算方法，同时给出了由规范的振型分解反应谱法得到的基础固定结构的地震作用取值。

Earthquake Action Calculation for Structures with Base-Isolated Random Seismic Model Based on the New Seismic Code

The earthquake action calculation for multi-DOF structures with base-isolation is studied systematically. The dynamic equations are firstly established, and then the structure is unfolded with the real modes. According to the situation that the mass matrix is non-symmetry and damping matrix is non-classical, the complex mode theory is further used to disconnect the equations. The relative displacement response is got using complex model under random seismic excitation in time domain based on the new seismic code. An example is given to show the method. At the same time, the earthquake action of base fixed structure by use of response spectrum method is also presented.