土与结构相互作用大比例模型试验研究
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摘要
通过对土槽中的1/4比例的钢框架模型进行激振,测得柔性地基的结构在不同上部结构-地基相对刚度比条件下的加速度反应。把结构吊至刚性地面,输入相同的地震波,测得结构在相应工况条件下的加速度响应。根据上部结构动力平衡方程,求出结构底部的剪力。对比同一工况下柔性地基条件下和刚性地基条件下结构底部的剪力,可得结构的底部剪力折减系数。结果显示,上部结构-地基相对刚度比是影响土与结构相互作用的重要因素,随着上部结构刚度的变化,结构的底部剪力也发生明显的变化。
A four-story steel frame model on the soil-trough was prepared with the scale of 1/4,and excited to acquire the acceleration responses in different working conditions.And then the structure was fixed to the rigid ground and re-excited with the same seismic wave under the same working conditions,and the acceleration responses of the structure were acquired again.According to the dynamic equilibrium equation,the bottom shear force of the structure was calculated and compared between the flexible foundation structure and the rigid foundation structure.The results show that the relative stiffness ratio between superstructure and ground soil is a key factor for soil-structure interaction.As the relative stiffness grows,the bottom shear force changes significantly.
A four-story steel frame model on the soil-trough was prepared with the scale of 1/4,and excited to acquire the acceleration responses in different working conditions.And then the structure was fixed to the rigid ground and re-excited with the same seismic wave under the same working conditions,and the acceleration responses of the structure were acquired again.According to the dynamic equilibrium equation,the bottom shear force of the structure was calculated and compared between the flexible foundation structure and the rigid foundation structure.The results show that the relative stiffness ratio between superstructure and ground soil is a key factor for soil-structure interaction.As the relative stiffness grows,the bottom shear force changes significantly.
引文
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[4]杨学山.工程振动测量仪器和测试技术[M].北京:中国计量出版社,2001:175―177.Yang Xueshan.Engineering vibration measuring instruments and testing technology[M].Beijing:China Metrology Publishing House,2001:175―177.(in Chinese)
[5]Wolf J P.Dynamic soil-structure interaction[M].Englewood Cliffs,New Jersey:Prentice-Hall,lnc,1985:38―50.
[6]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000:27―46.Fu Zhifang,Hua Hongxing.Modal analysis theory and applications[M].Shanghai:Shanghai Jiaotong University Press,2000:27―46.(in Chinese)
[7]尚守平,贺志文,王海东,等.上部结构与地基相对刚度比对土一结构体系基频影响试验研究[J].地震工程与工程振动,2008,28(5):94―101.Shang Shouping,He Zhiwen,Wang Haidong,et al.Experimental investigation on the effect of the relative stiffness ratio between superstructure and ground soil on the fundamental frequency of soil-structure system[J].Journal Earthquake Engineering and Engineering Vibration,2008,28(5):94―101.(in Chinese)
[8]谢晓杰,刘荣欣.土-结构动力相互作用研究概述[J].中国科技纵横,2009,5(12):157.Xie Xiaojie,Liu Rongxin.Researching overview of soil-structure interaction[J].China Science&Technology,2009,5(12):157.(in Chinese)
[9]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20―29.LüXilin,Chen Yueqing,Chen Bo,et al.Shaking table testing of dynamic soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):20―29.(in Chinese)
[10]陈波.土-桩基-结构动力相互作用体系的模拟及分析[D].上海:同济大学,2002.Chen Bo.Simulation and analysis on dynamic soil-pile-structure interaction system[D].Shanghai:Tongji University,2002.(in Chinese)
[11]余俊.饱和土地基-桩基-上部结构动力相互作用理论分析与试验研究[D].长沙:湖南大学,2007:30―60.Yu Jun.Theoretical analysis and test research on saturated soil-pile-structure dynamic interaction[D].Changsha:Hunan University,2007:30―60.(in Chinese)
[12]尚守平,邹新平,曹万林.钢框架-筏基结构与土相互作用试验研究[J].建筑结构学报,2012,33(9):74―80.Shang Shouping,Zou Xinping,Cao Wanlin.Experimental investigation on soil-structure interaction of steel frame-raft foundation[J].Journal of Building Structures,2012,33(9):74―80.(in Chinese)
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