软土场地地铁车站抗震计算的等代地震加速度法

Equivalent Static Method of Seismic Calculation for Subway Station in Soft Site

将软土地层中地铁车站结构与周围土体地震时产生的水平加速度,以静态的水平加速度代替,使两者作用下结构内力最大值相等、出现部位相同,实现将动力问题转化为静力问题。结果表明,该方法能反映软土地层中两层三跨地铁车站的在地震时的动力响应,是适用于工程设计的简单、实用的数值方法。

The horizontal acceleration of subway station structure in soft soil stratum and surrounding soil during earthquake is replaced by the static horizontal acceleration , which makes both of them have the equivalent maximum inner force and same position, and makes dynamic problem be transformed to static problem. With the horizontal acceleration replaced by a constant acceleration of seismic ground motion, and considering the spread of wave formation characteristics, depth, the type of soil layer, seismic fortification intensity, we calculate the response of double-layer and three-span subway station in soft soil under the seismic wave. The result shows that the equivalent static method of seismic response analysis can reflect the response of structure under the seismic wave. It is a simple and practical numerical method for the engineering design.