含软弱土层场地地震动加速度反应谱特征周期调整方法  

An adjustment method for the characteristic period of site acceleration response spectra with soft layers

作　　者：陈珍 郝冰 李远东 周正华 卞祝 韩轶 Chen Zhen;Hao Bing;Li Yuandong;Zhou Zhenghua;Bian Zhu;Han Yi(Collage of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学交通运输工程学院,南京211816

出　　处：《地震学报》2024年第4期734-750,共17页Acta Seismologica Sinica

基　　金：国家自然科学基金(U2039208,U1839202)资助.

摘　　要：在分析场地条件对地震震害影响及国内外关于软弱土层对场地地震反应影响的基础上,采用实际含淤泥质土层场地资料,建立了12个含软弱土层的场地模型,在不同输入地震动水平下进行了场地地震反应一维等效线性化分析,讨论了软弱土层厚度和埋深对场地地震反应的影响。结果表明:随着软弱土层的埋深或厚度的增加,反应谱特征周期逐渐增大;输入地震动峰值增加,反应谱特征周期亦增大。继而依据软弱土层厚度、埋深及输入地震动强度对场地加速度反应谱特征周期的影响特征,提出了含软弱土层场地地震动加速度反应谱特征周期调整方法。In recent years,the impact of soft soil on the seismic response of soil layers in sites has attracted attention.Some scholars have conducted in-depth analysis from different perspectives,and the research results show that soft soil increases the dominant period and response spectrum characteristic period of the site to a certain extent.As the position of the soft interlayer deepens,the amplification effect of the site decreases,and the dominant period and response spectrum characteristic period of the site increase.Compared with the Code for Seismic Design of Buildings(GB 50011-2010)in China,the characteristic period of the seismic acceleration response spectrum for sites containing weak soil layers after regulation is much larger than the value specified in the code.At present,although there is an analysis of the impact of weak soil layers on site seismic response,there is little research on the adjustment methods of characteristic periods of site response spectra containing weak soil layers.Based on the analysis for the effect of site conditions on earthquake damage and the influence of soft layers on site seismic response at home and abroad,12 site models are established,by means of drilling data from sites containing soft layers.The one-dimensional equivalent linearization site seismic response analysis is carried out under different input acceleration peak,and the influence of soft layer thickness,buried depth and input peak acceleration on site seismic response is discussed.The results show that under the same input acceleration peak,as the burial depth and thickness of soft layer increase,the characteristic period of the site acceleration response spectra gradually increases and the peak ground acceleration decreases.As the input peak acceleration increases,while the thickness and burial depth of the soft layer remain unchanged,the characteristic period of the site acceleration response spectra and the peak ground acceleration increases.Finally an adjustment method for the characteristic period of site acc

关 键 词：场地条件 地震动 特征周期 等效线性化 地震震害 

分 类 号：P315.4[天文地球—地震学]