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埋地管道-场地地震反应振动台试验研究的场地响应

DOI: 10.13197/j.eeev.2015.03.166.lily.021, PP. 166-176

Keywords: 多振动台试验,埋地管线,场地反应

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Abstract:

基于多子台台阵系统,北京工业大学于近期开展了多点地震动输入、不同场地条件下埋地管道振动台试验。试验中连续体模型箱固定于3个振动台台面上,相邻台面上的箱体能在水平双方向(纵向、横向)相对运动;3个振动台相互独立,通过分别对3个振动台输入各自的加速度记录实现了多点地震动输入。本文针对其中的横向水平地震激励作用下的场地响应进行研究,分析了一致和非一致地震作用下有无埋地管线时的场地地震响应规律。试验结果表明,非一致激励作用将增大场地土体的相对位移,致使相邻地震动输入点间场地土体受到剪切作用;随着输入地震动强度的增加,场地土体的一阶固有频率持续降低,阻尼比不断增大;非自由场的阻尼比、一阶固有频率等参数略大于自由场。

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