桩-土-桥相互作用对隔震连续梁桥地震响应的影响
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摘要
随着隔震技术在桥梁结构中的广泛应用,建立合理的桥梁模型进行隔震分析十分重要。以某连续钢箱梁桥为对象,建立了墩底固结不考虑桩土、M法桩和非线性有限元桩的三种桥梁模型,通过对这三种桥梁模型进行隔震前后的地震响应分析,以研究桩-土-结构相互作用对不隔震和隔震桥梁的影响。研究表明:考虑桩-土相互作用对该桥梁隔震前、后的地震响应都具有较大的放大效应,非线性有限元桩桥梁模型的放大效应大于M法桩的桥梁模型;三种模型的隔震率相差不大,不考虑桩-土-桥梁结构相互作用不会对隔震率产生过大估计。
With the seismic isolation technology is widely used in bridge structure,reasonable bridge model is very important for seismic isolation analysis.Taking one continuous steel box girder bridge as research object,three kinds of finite element models of that bridge are established:first one,all piers bottom fixed without consider pile and soil;second one,with M method pile;third one,use nonlinear finite element model of pile-soil.Then time history analysis of the three models before and after seismic isolation when subjected to El-Centro wave at the longitudinal and lateral side of the bridge are made respectively,seismic responses are compared and analyzed to find out the effects of soil-pile-bridge structure dynamic interaction.Finally,it is indicated that considering the dynamic interaction of soil-pile-bridge structure can amplify the seismic responses of this continuous bridge,and amplification effect of the third model is greater than the second one.But the interaction has little influence on ratio of isolation,so without consider the interaction of soil-pile-bridge will not lead to too large estimation of the isolation efficiency.
With the seismic isolation technology is widely used in bridge structure,reasonable bridge model is very important for seismic isolation analysis.Taking one continuous steel box girder bridge as research object,three kinds of finite element models of that bridge are established:first one,all piers bottom fixed without consider pile and soil;second one,with M method pile;third one,use nonlinear finite element model of pile-soil.Then time history analysis of the three models before and after seismic isolation when subjected to El-Centro wave at the longitudinal and lateral side of the bridge are made respectively,seismic responses are compared and analyzed to find out the effects of soil-pile-bridge structure dynamic interaction.Finally,it is indicated that considering the dynamic interaction of soil-pile-bridge structure can amplify the seismic responses of this continuous bridge,and amplification effect of the third model is greater than the second one.But the interaction has little influence on ratio of isolation,so without consider the interaction of soil-pile-bridge will not lead to too large estimation of the isolation efficiency.
引文
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[2]江宜城,杨德喜,李黎,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,24(1):104～107Jiang Yi-cheng,Yang De-xi,Li Li,et al.Stochastic Response Analysis of Seismically Isolated Bridges with LRB to Spatially Varying Earthquake Ground Motions[J].Journal of Vibration and Shock,2007,24(1):104～107(in Chinese)
[3]亓兴军,李小军,李亚琦.桩-土动力相互作用对连续梁桥半主动控制的影响研究[J].振动与冲击,2006,25(5):81～84Qi Xing-jun,Li Xiao-jun,Li Ya-qi.Study on the Influence of Pile-Soil Interaction upon Semi-Active Control of Continuous Beam Bridge[J].Journal of Vibration and Shock,2006,25(5):81～84(in Chinese)
[4]龙晓鸿,李黎.桩-土共同作用时连续梁桥隔震时程分析[J].中国市政工程,2006(3):20～23Long Xiao-hong,Li Li.Time Path Analysis of Shock Isolation of Continuous Girder Bridges under Pile-soil Interaction[J].China Municipal Engineering,2006(3):20～23(in Chinese)
[5]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001Fan Li-chu,Wang Zhi-qiang.The design of isolated bridge[M].Beijing:The People Traffic Press,2001(in Chinese)
[6]Skinner R I,Robinson W H,McVerry G H.An Introduction to Seismic Isolation[M],John Wiley and Sons,Inc,1993
[7]Ingham TJ,Rodriguez S,Donikian R.Seismic Analysis of Bridges with Pile Foundations[J].Computers and Structures,1999,72:49～62
[8]Novak M.Dynamic Stiffness and Damping of Piles[J].Canadian Geotechnical Journal,1974,11(4):574～598
[9]Nogami T,Otani J,Konagai K.Nonlinear Soil-Pile Interaction Model for Dynamic Lateral Motion[J].Journal of Geotechnical Engineering.1992,118(1):89～106
[10]陈清军,姜文辉,楼梦麟.群桩基础三维非线性地震反应分析[J].振动与冲击,2003,22(3):98～102Chen Qing-jun,Jiang Wen-hui,Lou Meng-lin.3D onlinear Response Analysis of Pile Group Under Seismic Loading[J].Journal of Vibration and Shock,2003,22(3):98～102(in Chinese)
[11]朱金龙,孙力彤.软土地基上桩基础使用m法计算的验证[J].同济大学学报(自然科学版),2003,31(8):902～905Zhu Jin-long,Sun Li-tong.Verification of m-method for Determination of Load on Piles in Soft-clay Ground[J].Journal of Tongji University,2003,31(8):902～905(in Chinese)
[12]何雄君,周莉娜,王启武.用有限元法求解基桩的屈曲临界载荷[J].武汉理工大学学报,2003,25(6):25～27He Xiong-jun,Zhou Li-na,Wang Qi-wu.Solution of Buckling Loads for Piles with FEM[J].Journal ofWuhan University of Technology,2003,25(6):25～27(in Chinese)
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