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实际的地震动在水平面上总是有两个方向,然而,关于双向地震动如何影响结构的动力反应以及只考虑单向作用是否足够,一直都是一个有争议的问题。该文首先分析了分歧存在的原因。在此基础上,主要研究了地震动方向的随机性对结构反应的影响,同时对结构反应的弹性阶段和塑性阶段分别进行分析。结果表明:考虑地震动方向的随机性,在弹性阶段,基底剪力比不考虑该因素时平均增大8%;在塑性阶段,考虑地震动方向的随机性及结构两个方向的受力性能耦合,比只考虑受力性能耦合的情况,地震位移反应平均增大12%,比单向地震作用下的简化2维模型位移反应(既不考虑方向随机性也不考虑受力性能耦合)平均增大15%。最后,通过统计分析,给出了保证95%设计安全性的结构反应增大系数。
The actual earthquakes always have two directions in the horizontal plane. However, it remains a controversial issue how the dynamic response of two-way earthquakes affects the structure and whether or not only the unidirectional effects are considered. The article first analyzes the reasons for the existence of differences. On this basis, we mainly study the influence of the randomness of the ground motion direction on the structural response, and analyze the elastic and plastic phases of the structural response respectively. The results show that considering the randomness of ground motion direction, in the elastic phase, the base shear ratio increases by 8% on average without considering this factor. In the plastic phase, considering the randomness of the ground motion direction and the mechanical behavior in both directions Compared with the case of considering only the coupling of mechanical properties, the seismic displacement response increases by 12% on average, which is more than that of the simplified two-dimensional model under unidirectional earthquakes (regardless of direction randomness and force coupling) Increase by 15%. Finally, through the statistical analysis, the coefficient of structural reaction increase, which guarantees 95% design safety, is given.