土-结构动力相互作用振动台试验中模型地基影响因素分析
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摘要
为了给出土-结构动力相互作用大型振动台试验中模型地基设计的一般原则,结合各国已有的典型试验中模型地基的动力响应实测结果,以加速度峰值放大系数及其傅里叶幅值谱为分析依据,从边界效应、模型地基高度、土体含水量及地震波输入次数4个方面对模型地基的振动性态进行了比较分析。结果表明:土箱刚性、土的自振特性、地基高度、土体含水量及地震波的输入次数是影响模型地基动力特性的主要因素,并提出了相应的控制原则。该结论可为同类试验中模型地基的设计和试验的顺利开展提供有益的参考。
The general principle of large scale shaking table test of soil-structure dynamic interaction was investigated.Taking the amplification coefficients of peak acceleration and its corresponding Fourier amplitude spectrum as main factors,the measured results of existing typical shaking table tests were analyzed and the vibration behaviors of foundation model were compared in terms of boundary effect,height of foundation model,moisture content of soil and numbers of input seismic waves.The results show that the main factors affecting vibration behavior of foundation model are stiffness of soil box,self-vibration behavior of soil,foundation height,moisture content of soil and numbers of input seismic waves.At the same time,the corresponding control principles are proposed.These conclusions will be very helpful for the future test design of foundation model.
The general principle of large scale shaking table test of soil-structure dynamic interaction was investigated.Taking the amplification coefficients of peak acceleration and its corresponding Fourier amplitude spectrum as main factors,the measured results of existing typical shaking table tests were analyzed and the vibration behaviors of foundation model were compared in terms of boundary effect,height of foundation model,moisture content of soil and numbers of input seismic waves.The results show that the main factors affecting vibration behavior of foundation model are stiffness of soil box,self-vibration behavior of soil,foundation height,moisture content of soil and numbers of input seismic waves.At the same time,the corresponding control principles are proposed.These conclusions will be very helpful for the future test design of foundation model.
引文
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[2]冯振宇,王忠民,樊丽俭.粘弹性点支承粘弹性桩的动力稳定性分析[J].中国公路学报,2006,19(1):67-70.FENG Zhen-yu,WANG Zhong-min,FAN Li-jian.Dy-namic Stability Analysis of Visco-elastic Pile withPoint Visco-elastic Supports[J].China Journal ofHighway and Transport,2006,19(1):67-70.
[3]伍小平.砂土-桩-结构相互作用振动台试验研究[D].上海:同济大学,2002.WU Xiao-ping.Research of Shaking Table Test ofSandy Soil-pile-structure Interaction[D].Shanghai:Tongji University,2002.
[4]KEIZO O,TOSHIO S,TADASHI K,et al.Substan-tial Cross Section Plastic Deformation of UndergroundReinforced Concrete Structure During Strong Earth-quakes[J].Journal of JSCE,2003,62(1):157-175.
[5]韦晓.桩-土-桥梁结构相互作用振动台试验与理论分析[D].上海:同济大学,1999.WEI Xiao.Research of Shaking Table Test of Soil-pile-bridge Interaction[D].Shanghai:Tongji Universi-ty,1999.
[6]周林聪.地震作用下大跨度地下结构振动性态研究[D].南京:河海大学,2002.ZHOU Lin-cong.Research of Vibration Behavior forLarge-span Underground Structure Under Earthquake[D].Nanjing:Hohai University,2002.
[7]陈跃庆.结构-地基动力相互作用体系振动台试验研究[D].上海:同济大学,2001.CHEN Yue-qing.Shaking Table Testing on DynamicSoil-structure Interaction System[D].Shanghai:Tongji University,2001.
[8]季倩倩.地铁车站结构振动台模型试验研究[D].上海:同济大学,2002.JI Qian-qian.Research of Shaking Table Test of Sub-way Station[D].Shanghai:Tongji University,2002.
[9]樱井彰雄.地盘耐震学[M].东京:丸善出版社,1999.SAKURAI A.Aseismic Ground Engineering[M].To-kyo:Maruzen Publication,1999.
[10]赵明华,肖燕,陈昌富,等.考虑土体蠕变特性的桥台软基变形分析[J].中国公路学报,2006,19(2):56-61.ZHAO Ming-hua,XIAO Yan,CHEN Chang-fu,et al.Analysis of Deformation on Soft Subsoil AroundBridge Abutment Considering Soil Creep Property[J].China Journal of Highway and Transport,2006,19(2):56-61.
[11]沈蒲生,方辉,夏心红,等.考虑施工过程和收缩徐变的框架结构简化分析[J].建筑科学与工程学报,2006,23(2):41-45.SHEN Pu-sheng,FANG Hui,XIA Xin-hong,et al.Simplified Analysis for Frame Structure ConsideringConstruction Process,Shrinkage and Creep[J].Jour-nal of Architecture and Civil Engineering,2006,23(2):41-45.
[12]易伟建,张颖.混凝土框架结构抗震设计的弯矩增大系数[J].建筑科学与工程学报,2006,23(2):46-51.YI Wei-jian,ZHANG Ying.Moment MagnificationFactor in Anti-seismic Design of Concrete FrameStructure[J].Journal of Architecture and Civil Engi-neering,2006,23(2):46-51.
[13]FISHMAN K L,MANDER J B,RICHARDS R.Labo-ratory Study of Seismic Free-field Response of Sand[J].Soil Dynamics and Earthquake Engineering,1995,14(1):33-43.
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