非活动隐伏断层对结构地震反应的影响

Influence of non-active concealed fault to seismic response of structure

采用有限元方法分别建立了包含隐伏断层和不包含断层的场地模型,分析了在各种频率水平入射波作用下该场地地面结构的动力反应。计算结果表明,隐伏断层对地面结构的动力反应有一定的放大作用,特别是当入射波的频率与场地的基频接近时,放大效应更为明显。这一结果说明,在包含隐伏断层的场地进行重大工程建设时,需要考虑断层对地震动的影响。

In this paper, finite element method was used to build a ground model containing a nonactive concealed fault and an unfaulted ground model. And the responses of the ground surfaces under the horizontal incident waves with different frequencies were analyzed. The results indicate that the concealed fault brings about some amplification of response of the above ground structure and the amplification is more obvious when the frequency of the incident wave approximates to the site natural frequency. Therefor,the influence of fault on ground motion is need to be considered for the major engineering constructions on the site with concealed fault.