基于土-结构动力相互作用的结构隔震研究
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摘要
利用土-结构动力相互作用中的地基隔震效应,提出换填地基进行结构隔震的新途径。依据成层地基中的单桩水平阻抗函数研究了土层动力特性对桩基阻抗的影响,指出在较坚硬场地上,只对桩身一定范围内的地基进行软化换填时,就可明显减弱桩基阻抗作用,降低其传递给上部结构的地震作用,从而达到上部结构隔震的效果。算例表明这一隔震途径的可行性和合理性。
Based on dynamic soil-structure interaction,a new structure isolation approach with soil-exchanging was presented through considering the isolation effect of soil in dynamic soil-structure interaction.The influence of the soil dynamic characteristics on the impedance of single pile was discussed according to the dynamic impedance of single pile in layered soil.Through soft soil-exchanging close to pile,the dynamic impedance of pile can be weakened obviously in hard site,and the earthquake action to superstructure can be weakened too,the isolation effect is obtained.The numerical example proves that the structure isolation approach is rational and feasible.
Based on dynamic soil-structure interaction,a new structure isolation approach with soil-exchanging was presented through considering the isolation effect of soil in dynamic soil-structure interaction.The influence of the soil dynamic characteristics on the impedance of single pile was discussed according to the dynamic impedance of single pile in layered soil.Through soft soil-exchanging close to pile,the dynamic impedance of pile can be weakened obviously in hard site,and the earthquake action to superstructure can be weakened too,the isolation effect is obtained.The numerical example proves that the structure isolation approach is rational and feasible.
引文
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[8]卢华喜.成层地基-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,2006.LU Hua-xi.Theoretical analysis and test research on dy-namic layered soil-pile-structure interaction[D].Changsha:Hunan University,2006.
[2]陈跃庆,吕西林,李培振,等.分层土-基础-高层框架结构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,2001,21(3):104-112.CHEN Yue-qing,LU Xi-lin,LI Pei-zhen,et al.Shakingtable testing for layered soil-foundation-structure inter-action system[J].Earthquake Engineering and Engineer-ing Vibration,2001,21(3):104-112.
[3]陈跃庆,吕西林,侯建国,等.不同土性地基中地震波传递的振动台模型试验研究[J].武汉大学学报,2005,38(2):49-53.CHEN Yue-qing,LU Xi-lin,HOU Jian-guo,et al.Sha-king table model testing on transfer of earthquake wave invarious ground soils[J].Journal of Wuhan University,2005,38(2):49-53.
[4]陈跃庆,吕西林.几次大地震中地基基础震害的启示[J].工程抗震,2001,23(2):8-15.CHEN Yue-qing,LU Xi-lin.Lessons learned from earth-quake damages of soil and building foundation during sev-eral notable strong earthquakes[J].Seismic Engineering,2001,23(2):8-15.
[5]Mendoza MJ,Auvinet G.The Mexico earthquake of Sep-tember 19,1985-behavior of building foundation inMexico city[J].Earthquake Spectra,1988,4(4):835-853.
[6]Dobry R,Gazetas G.Simple method for dynamic stiffnessand damping of floating pile groups[J].G啨otechnique,1988,38(4):557-574.
[7]Fan K,Gazetas G,Kaynia A,et al.Kinematic seismicresponse of single piles and pile groups[J].Journal ofGeotechnical Engineering,ASCE,1991,117(12):1860-1879.
[8]卢华喜.成层地基-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,2006.LU Hua-xi.Theoretical analysis and test research on dy-namic layered soil-pile-structure interaction[D].Changsha:Hunan University,2006.
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