土-结构相互作用1:4钢框架-筏板基础模型激振试验研究
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摘要
为了了解土与结构的相互作用,在土槽中进行1∶4钢框架的激振试验,试验通过改变上部结构刚度,分别输入高斯白噪声测自振周期,EL波和Taft波研究其动力反应及土体对上部结构的减震效果,与有限元软件SAP2000模拟刚性地基上的钢框架做动力反应分析对比,发现自振周期有一定差异,上部结构刚度越大附加周期越大,附加周期最大值达到0.22 s。土体对钢框架有一定的减震效果,这种减震效果主要跟上部结构刚度变化有关,由于土-结构相互作用,钢框架在土槽中激振时顶层加速度峰值比在刚性地基上激振时减小,折减系数达0.661,而顶层位移峰值则增大。
In order to understand the soil-structure interaction,the excitation test of 1∶4 scaled steel frame-raft foundation model was carried out in the soil bin.By changing the stiffness of the superstructure,Gaussian white noise was inputted to measure vibration period,EL wave and Taft wave was inputted to known dynamic response and the shock absorption effected about the soil to the upper structure,the finite element software SAP2000 was used to simulate the steel frame-raft on rigid foundation,and then the dynamic response was analyzed.The results showed that the greater the additional period the upper part of the greater structural stiffness.The maximum of the additional period reaches 0.22 s.The soil has shock absorbing effect to the steel frame,and the effect is mainly with the change of structure stiffness.Because of the soil-structure interaction,the peak acceleration of the top storey is reduced while the steel framework is excited in the soil bin than on rigid foundation,the reduction factor is reached 0.661,and the peak displacement of the top storey is increased.
In order to understand the soil-structure interaction,the excitation test of 1∶4 scaled steel frame-raft foundation model was carried out in the soil bin.By changing the stiffness of the superstructure,Gaussian white noise was inputted to measure vibration period,EL wave and Taft wave was inputted to known dynamic response and the shock absorption effected about the soil to the upper structure,the finite element software SAP2000 was used to simulate the steel frame-raft on rigid foundation,and then the dynamic response was analyzed.The results showed that the greater the additional period the upper part of the greater structural stiffness.The maximum of the additional period reaches 0.22 s.The soil has shock absorbing effect to the steel frame,and the effect is mainly with the change of structure stiffness.Because of the soil-structure interaction,the peak acceleration of the top storey is reduced while the steel framework is excited in the soil bin than on rigid foundation,the reduction factor is reached 0.661,and the peak displacement of the top storey is increased.
引文
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[6]Xiong Wei.Research on an innovative distributed seismic i-solation system based on SSI and nonlinear soil response[D].Changsha:Hunan University,2009.[熊伟.基于SSI及非线性土体反应的新型分布式隔震系统研究[D].长沙:湖南大学,2009.]
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[8]Lu Xilin,Zhang Zhiying,Cao Wenqing.Shaking table experi-mental study on composite modal damping ratio of SSI sys-tem[J].Chinese Quarterly of Mechanics,2003,24(1):75-80.[吕西林,张之颖,曹文清.土-结构相互作用体系合成模态阻尼比的振动台模型试验研究[J].力学季刊,2003,24(1):75-80.]
[9]Lu Xilin,Chen Yueqing,Chen Bo,et al.Shaking table tes-ting of dynamic soil-structure interaction system[J].Journalof Earthquake Enginnering and Engineering Vibration,2000,20(4):20-29.[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.]
[10]Shang Shouping,He Zhiwen,Wang Haidong,et al.Experi-mental investigation on the effect of the relative stiffness rati-o between super-structure and ground soil on the fundamen-tal frequency of soil-structure system[J].Journal of Earth-quake Enginnering and Engineering Vibration,2008,28(5):94-101.[尚守平,贺志文,王海东,等.上部结构与地基相对刚度比对土-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.]
[11]Wang H L.A comparison of soil—structure action calcula-tions with results of full—scaleorced vibration tests[J].SoilDynamics and Earthquake Engineering,1988,7(1):22-31.
[12]Lu Xilin,Jiang Huanjun.Progress of seismic research in thefield of building structural engneering[J].Journal of TongjiUniversity:Natural Science,2004,32(10):1278-1284.[吕西林,蒋欢军.建筑结构抗震研究的若干进展[J].同济大学学报:自然科学版,2004,32(10):1278-1284.]
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