摘要
根据土体-结构体系整体分析方法,以某26层桩箱基础框架-剪力墙高层建筑为例,探讨了深厚软弱地基与输入地震动特性对桩箱基础高层建筑地震反应的影响。通过数值模拟,得到以下结论:地震作用下高层建筑的地震反应与建筑物的地基条件与输入的振动特性等因素有关。一般地,SSI效应使上部结构的绝对加速度反应减小,但当输入加速度峰值较低时,建筑物部分楼层的绝对加速度反应有可能增大。在给定的输入地震动作用下,SSI效应使上部结构的楼层相对位移增大,但也可能存在减小的情况。分析结果表明:SSI效应对深厚软弱地基上桩箱基础高层建筑地震反应有很大的影响,在此类建筑的抗震分析中考虑SSI效应的影响是必要的。
Based on the technique of global analysis of soilstructure system, a 26stroied frameshear wall highrise building with pilebox foundation on deep soil deposits is analyzed under input different ground motions. The effects of soilstructure interaction (SSI) on the structural response are discussed and some conclusions are drawn. First, when the input ground motion acceleration peak value is in high level, the SSI effects can notably reduce the absolute acceleration response of the structure, but when the input ground motion acceleration peak value is in low level, the SSI effects may enhance the acceleration response of the structure; Second, SSI effects may reduce or enhance the relative displacement response of the structure. This is related to the characteristics of the input ground motion. The results show that it is necessary to take account of soilstructure interaction effect in the seismic analysis of highrise buildings.
出处
《地震工程与工程振动》
CSCD
北大核心
2003年第2期108-116,共9页
Earthquake Engineering and Engineering Dynamics
基金
江苏省自然科学基金项目(BK99125)
中国地震局地震工程与工程振动开放实验室基金
国家教育部骨干教师资助基金联合资助(2000)
关键词
软弱地基
桩箱基础
高层建筑
地震动
地震反应
数值模拟
抗震分析
soil-structure interaction
earthquake response
pile-box foundation
high-rise building
dynamic behavior
