不同土性地基上高层隔震结构振动台试验对比研究
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摘要
通过土-结构动力相互作用(SSI)体系的模型振动台对比试验,研究不同土性地基上高层隔震结构的地震反应特性和隔震效果。采用叠层剪切型土箱以减小边界效应影响,模型地基分别为刚性地基、均匀软土层地基、分层可液化地基,采用高宽比为4的五层钢框架作为上部隔震结构模型。试验发现,考虑SSI的隔震结构体系频率均小于不考虑SSI的体系频率,均匀软土层地基上隔震结构体系的阻尼比刚性地基增加,而分层可液化地基上体系的阻尼则降低;软弱地基上隔震层位移可明显大于刚性地基上的情况,而当地基发生液化时隔震层的位移则明显减小。研究结果表明,建造于软弱地基、存在液化可能地基上的高层隔震结构仍然能够发挥隔震效果。
Shaking table tests for the comparison of dynamic soil-structure interaction(SSI) systems were conducted,to investigate the seismic behavior and the isolation effectiveness of a high-rise isolated structure founded on various soil foundations.A laminar shear soil container was designed to minimize the boundary effects.The high-rise isolated structure was modeled as a five-story steel frame with aspect ratio of 4,founded on rigid foundation,homogeneous soft soil foundation and layered liquefiable foundation,respectively.Test results indicate that the natural frequency of the SSI isolated structure system is less than that of the system when SSI is not taken into account.The damping ratio of the isolated structure on homogeneous soft soil foundation is larger than that on rigid foundation,while it is smaller than that on liquefiable foundation.It is also shown that the isolation displacement may increase obviously when founded on soft soil,while decreases evidently when founded on liquefiable foundation.The study concludes that,even founded on soft soil or liquefiable foundation,the isolation effectiveness of the high-rise isolated structure can be warranted.
Shaking table tests for the comparison of dynamic soil-structure interaction(SSI) systems were conducted,to investigate the seismic behavior and the isolation effectiveness of a high-rise isolated structure founded on various soil foundations.A laminar shear soil container was designed to minimize the boundary effects.The high-rise isolated structure was modeled as a five-story steel frame with aspect ratio of 4,founded on rigid foundation,homogeneous soft soil foundation and layered liquefiable foundation,respectively.Test results indicate that the natural frequency of the SSI isolated structure system is less than that of the system when SSI is not taken into account.The damping ratio of the isolated structure on homogeneous soft soil foundation is larger than that on rigid foundation,while it is smaller than that on liquefiable foundation.It is also shown that the isolation displacement may increase obviously when founded on soft soil,while decreases evidently when founded on liquefiable foundation.The study concludes that,even founded on soft soil or liquefiable foundation,the isolation effectiveness of the high-rise isolated structure can be warranted.
引文
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[3]刘文光.橡胶隔震支座力学性能及隔震结构地震反应分析研究[D].北京:北京工业大学建筑工程学院,2003.
[4]何文福,刘文光,张颖,等.高层隔震结构地震反应振动台试验分析[J].振动与冲击,2008,27(8):97-101.HE Wen-fu,LIU Wen-guang,ZHANG Ying,et al.Experimental study on high rise isolated structure[J].Journal of Vibration and Shock,2008,27(8):97-101.
[5]Constantinou M C,Kneifati C.Dynamics of soil-base-isolated-structure system[J].Journal of Structural Engineering,ASCE,1988,144(1):211-220.
[6]李海岭,葛修润.土-结构相互作用对基础隔震体系的影响[J].土木工程学报,2001,34(4):83-87.LI Hai-ling,GE Xiu-run.Effect of soil-structure interaction on base-isolated building system[J].China Civil Engineering Journal,2001,34(4):83-87.
[7]李忠献,李延涛,王健.土-结构动力相互作用对基础隔震的影响[J].地震工程与工程振动,2003,23(5):180-186.LI Zhong-xian,LI Yan-tao,WANG Jian.Influence of soil-structure dynamic interaction on base isolation[J].Earthquake Engineering and Engineering Vibration,2003,23(5):180-186.
[8]Tsai C S,Chen C S,Chen B J.Effects of unbounded media on seismic responses of FPS-isolated structures[J].Struct Control Health Monit,2004,11(1):1-20.
[9]于旭,宰金珉,王志华.考虑SSI效应的铅芯橡胶支座隔震结构体系振动台模型试验[J].南京航空航天大学学报,2010,42(6):786-792.YU Xu,ZAI Jin-ming,WANG Zhi-hua.Shaking table model test on lead core rubber bearing in isolation structure system considering SSI[J].Journal of Nanjing University of Aeronautics&Astronautics,2010,42(6):786-792.
[10]宋二祥,武思宇,王宗纲.地基-结构系统振动台模型试验中相似比的实现问题探讨[J].土木工程学报,2008,41(10):87-92.SONG Er-xiang,WU Si-yu WANG,Zong-gang.A tentative solution for similituder realization in shaking table tests of SSI systems[J].China Civil Engineering Journal,2008,41(10):87-92.
[11]陈国兴,王志华,左熹,等.振动台试验叠层剪切型土箱的研制[J].岩土工程学报,2010,31(1):89-96.CHEN Guo-xing,WANG Zhi-hua,ZUO Xi,et al.Development of laminar shear soil container for shaking table tests[J].Chinese Journal of Geotechnical Engineering,2010,31(1):89-96.
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