考虑地基土液化影响的高层建筑地震反应分析

Effect of subsoil liquefaction on earthquake response of highrise building system

为了研究地基土液化对高层建筑地震反应的影响,本文简要介绍了分时段等效线性有效应力动力分析方法,且将其中的等效线性化方法改进为逐步迭代非线性方法,并利用ANSYS程序的参数化设计语言将这一分析方法并入ANSYS程序中,最后分析了考虑液化时桩基-高层建筑体系的地震反应。认为对于单层砂土-桩基-高层建筑体系来说,砂土的液化对上部结构地震反应有较大的影响;而对于本文采用的上海土-桩基-高层建筑体系来说,砂土层的液化未对上部结构的地震反应产生明显的影响。

In order to analyze the effect of subsoil liquefaction on the seismic response of SSI system, the effective stress method for considering the soil as an equivalent linear material in every time division is introduced. Furthermore, the method of equivalent linearity is improved to calculate the nonlinearity in a step by step way. And the method is realized in ANSYS program by using the APDL (ANSYS parametric design language). The earthquake response of pile-highrise building is analyzed, and the results show that the liquefaction of sand has great effect on the seismic response of structure in sand-pile-structure interaction system, while the liquefaction of sand layer has little effect on the seismic response of structure in the soil-pile-structure interaction system under Shanghai soil condition.