文献类型：期刊文献

中文题名：层状地基桩柱结构地震响应特性研究

英文题名：Seismic response of piles structure in layered soil foundation

作者：杨章锋[1,2];张卫平[3]

机构：[1]广东海洋大学海洋工程学院,广东湛江524088;[2]河海大学港口海岸与近海工程学院,江苏南京210098;[3]大连理工大学港口海岸与近海工程国家重点实验室,辽宁大连116024

年份：2017

卷号：37

期号：5

起止页码：178

中文期刊名：地震工程与工程振动

外文期刊名：Earthquake Engineering and Engineering Dynamics

收录：北大核心2014、CSCD2017_2018、北大核心、CSCD

基金：广东海洋大学创新强校工程科研项目(GDOU2016050258)~~

语种：中文

中文关键词：层状土层;地震波;选择性滤波;地震动力响应

外文关键词：layered soil; earthquake wave; selective filtering; seismic response

中文摘要：为研究自然地质环境条件下非均质层状地基对结构物地震响应的影响,本文通过层状饱和土的刚度矩阵的建立,对不同夹层条件下的地基地震响应进行了对比研究。研究结果表明:相较于均质土层地基,由于非均质地基土层存在的非连续性界面,非均质夹层能明显影响地基的波动响应特征,对地震波有着显著的选择性滤波作用,尤其在含软夹层地基条件下能极大削弱入射波中的高频成分,而硬夹层则能极大滤除地震波中的低频成分。在对地基地震响应研究的基础上,通过对单桩和群桩码头结构的地震响应的数值模拟,对含夹层地基条件下不同刚度结构地震响应特性进行了对比研究。对比研究表明:对不同刚度的结构物,由于其固有自振频率的差异,不同夹层地基对其地震动力响应存在显著不同的影响规律,由于单桩结构较低的固有频率,使得其对低频波更为敏感,其固有振型在含软夹层地基条件下更容易被激发引起结构共振,而群桩结构则刚好相反,由于其更高的固有频率,在软夹层地基条件下由于高频波的滤除使得结构的地震动力响应显著降低,而在均质或含硬夹层条件下更容易激发其固有振型。通过对不同夹层地基条件下结构地震动力响应规律的研究,可以看出结构的地震动力响应同时受地基夹层条件以及结构自身动力特性的影响,相关研究结论可为非均质地基条件下的结构地震响应研究提供参考。

外文摘要：In order to investigate the influence of the discontinuous layered soil in natural geological environment on the seismic response of civil engineering structure, through the build of the stiffness matrix of saturated soil layer, comparative studies on the seismic response of muhilayered soils subjected to earthquake incident were conducted. Results show that compared with homogeneous soils foundation, owing to the discontinuous interface between soil layers, which can significantly affect the dynamic response of soil, shows obvious selective filtering effect of earthquake waves. Especially the high-frequency part of earthquake wave was significantly filtered with soft middle layer, while the lower-frequency part of earthquake wave can be filtered by hard middle layer. Based on the seismic response of layered soil foundation, the numerical simulation of the seismic response of a single pile structure and a piles pier structure were carried out, through the comparative studies of the seismic response of structure with different layered soil foundation, results show that for the structures with different natural frequency, the influence of layered soil foundation demonstrates distinct influence pattem. For the single pile structure with lower natural frequency, which is more sensitive to lower frequency wave, and subsequently it more rends to be excited with soft middle layer, while for the piles pier structure, owing to the higher natural frequency, which just yields an opposite result that the seismic response was depressed significantly with soft middle layer, while the natural vibration mode more tends to be excited with homogenous or hard layer soil foundation. Through the comparative studies conducted in this paper, it can be concluded that the seismic response of structure was affected by foundation＇ s condition and structure＇ s dynamic characteristic at the same time, the conclusions derived in this paper can provide some useful reference for the research in earthquake engineering with layered soil foundation.