深厚软弱地基上多层地下室-桩基-双塔高层建筑的地震反应分析

Numerical simulation of the earthquake response for double tower high-rise building with pile-multistoried basements on deep soft sites

采用二维有限元整体分析法,对深厚软弱地基上带多层地下室的桩箱基础双塔和单塔高层建筑的地震反应进行了数值模拟,探讨了SSI效应对其地震反应的影响。结果表明:深厚软弱地基上双塔和单塔高层建筑的地震反应有很大差别,这种差别与场地条件和输入地震动特性有关。一般地,双塔高层建筑的楼层绝对加速度反应比单塔高层建筑的反应要小得多;但当输入加速度峰值较小时,前者的绝对加速度反应也可能比后者大;而对于楼层相对位移反应而言,除极个别的楼层外,前者相对位移反应比后者的要小,尤其是高层建筑中上部各楼层的反应。此外,双塔高层建筑塔间连体的设置位置及刚度对深厚软弱地基上双塔高层建筑的地震反应也有很大的影响。

In this paper, numerical simulation of the earthquake response for double and single tower high-rise building with pile-multistoried basement on deep soft sites were analyzed by 2-dimension finite element. The influence of SSI on their earthquake response was discussed. The results show that there are great difference between the earthquake responses of double and single tower high-rise buildings, this related to the input ground motion and sites. In general, compared with single tower high-rise building, the absolute acceleration response of double-tower high-rise building is much smaller, but when the of peak value of input acceleration time-history is small, the absolute acceleration response of double-tower high-rise building may be larger for some floors. As for the earthquake response of relative displacement, the response of double tower high-rise building is smaller than that of single tower high-rise building except for several floors. Still, this paper discussed the influence of connections between the two towers, the results show that the setting height and stiffness of connections have great effect on the earthquake response of high-rise building with two towers.