砂土场地地铁车站抗震计算方法

Seismic Calculation Method of Subway Station in Sandy Site

选取典型砂土场地地铁车站,分别采用反应位移法、反应加速度法、有限元动力分析法对其在地震作用下的结构内力进行计算,分析不同抗震计算方法在地铁车站抗震设计中的适用性。结果表明:对于砂土场地地铁车站,3种抗震计算方法所得的结构内力最大值位置基本一致,最大弯矩、最大剪力均出现在侧墙底部与底板端部,最大轴力均出现在中柱底部与侧墙底部;反应加速度法计算结果与有限元动力分析法更为接近,反应位移法计算结果与有限元动力分析法相差较大,宜采用反应加速度法进行砂土场地地铁车站等地下结构的抗震计算。

The structural internal forces of typical subway station in sandy site under earthquake action were calculated by response displacement method,response acceleration method and finite element dynamic analysis method. The applicability of different seismic calculation methods in the seismic design of subway station was analyzed. The results show that for the subway station in sandy site,the positions of the maximum structural internal forces calculated by the three seismic calculation methods are basically the same,the maximum bending moment and the maximum shear force appear at the bottom of the side wall and the end of the base plate,and the maximum axial force appears at the bottom of the middle column and the side wall. The calculation results of the reaction acceleration method are closer to those of the finite element dynamic analysis method,and the calculation results of the reaction displacement method are quite different from those of the finite element dynamic analysis method. The response acceleration method should be used to calculate the earthquake resistance of underground structures such as subway stations in sandy site.