摘要
在黄土场地与地铁地下结构动力相互作用振动台试验中,测得模型地基及地铁车站的加速度反应及应变反应。基于实测数据对模型地基、地铁车站的加速度反应进行了频域分析,对比不同观测断面内地铁车站的地震反应,分析地铁车站加速度反应的空间效应。结果表明:随输入峰值加速度增加,模型体系加速度反应傅里叶谱基频减小,相应谱值增大;随埋深减小地基加速度反应傅里叶谱低频成分增大,高频成分减小,且增大部分频带宽度随输入峰值加速度增加而缩小;随输入峰值加速度增加,结构加速度反应傅里叶谱主频集中、变窄,高频成分呈现增强效应;模型体系加速度反应傅里叶谱主频带宽呈现出松潘波作用时较宽,西安人工波作用时居中,Taft波作用时较窄;受结构端头效应及土结相互作用中倾斜与扭转影响,地铁车站地震反应具有显著的空间效应。研究结论可为黄土地区地铁地下结构的抗震设计及相关理论研究提供重要参考。
The shaking table tests of underground subway station in loess area were performed,the acceleration and strain responses of soil and the structure were measured.The frequency domain analysis for acceleration responses of the model system was conducted,and the spatial effects on seismic responses of the station were analyzed by comparing data of different observation sections.The results showed that the fundamental frequencies of the model system＇s acceleration Fourier spectra decrease with increase in PGA,meanwhile,the corresponding amplitudes of Fourier spectra increase with increase in PGA;the Fourier spectra values of low-frequency components of accelerations increase and their high-frequency components decrease,and the bandwidth of low-frequency components decreases with increase in PGA;the Fourier spectra values of high-frequency components of accelerations of the station increase and the main frequencies of the spectra are concentrated and become narrower with increase in PGA;the main frequency band width of Fourier spectra of accelerations of the model system is wider under the action of Songpan wave,it is medium under the action of Xi＇an artificial wave and narrower under the action of Taft wave;meanwhile,the spatial effects on seismic responses of the station are obvious because of end effects of the structure and torsion in interaction between soil and structure.The results provided a reference for aseismic design and theoretical study of underground structures in loess area.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第21期102-112,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(41472267)
中央级公益性科研专项基金项目(DQJB14B50)
西安市地下铁道有限责任公司科研基金(D4-YJ-042014048)
关键词
黄土地区
地铁车站
振动台试验
加速度反应
频域分析
空间效应
loess area
subway station
shaking table test
acceleration response
frequency domain analysis
spatial effect
