事实证明，地震动是多维的，结构反应也是多维的。
In fact, the earthquake excitation is multidirectional, so does the structure response.
多点地震动作用下结构随机地震反应的计算十分耗费时问。
The random response computation of structures under multiple-support excitations is a problem of time consumption.
在此基础上，进一步分析了地震动不确定性对结构反应的影响。
According to this, we further analyze the influence of the uncertainty on structural response.
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