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我国工业与民用建筑抗震设计规范给出的抗震设计方法,包括基底剪力法和振型分解法,都是以反应谱理论为基础的。如所周知,反应谱理论又是建立在这样的前提之下的,即结构物始终保持弹性性质,可作振型分解,而各振型的反应可以通过单质点弹性体系的地震反应来求得。该结构物的地震反应,就是各振型反应的组合。为了反映实际结构物的情况和赖以建立反应谱理论的这些假设之间的差异,在计算地震荷载时,规范引入了一个系数,即结构影响系数C,对按反应谱计算的结果作一修正。但是,它的取值基本上是凭工程经验协商确定的。
The seismic design methods given in the seismic design code for industrial and civil buildings in China, including the base shear method and the vibration mode decomposition method, are based on the response spectrum theory. As is well known, the response spectrum theory is based on the premise that the structure always maintains the elastic properties and can be decomposed by modes. The response of each mode can be obtained through the seismic response of the single-point elastic system. . The seismic response of the structure is a combination of vibrational responses. In order to reflect the differences between the actual structures and the assumptions underlying the establishment of the response spectrum theory, the code introduces a factor, the structural influence coefficient, C, in the calculation of the seismic load. A correction is made to the results calculated by the response spectrum. . However, its value is basically negotiated through engineering experience.