桩-土-承台相互作用对城市曲线匝道桥抗震性能的影响
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摘要
针对城市曲线匝道桥的结构特点,以某一实际工程为背景,采用m法分析了承台侧向土刚度的不同取值对低桩承台基础等效平动及转动刚度的影响。应用线性及非线性时程反应分析方法研究了承台侧向土刚度对结构弹性、弹塑性地震反应以及抗震性能的影响。结果表明:承台侧向土刚度对曲线匝道桥桩基础的切向平动及转动刚度影响较大;随着承台侧向土刚度的增加,桥墩的地震反应逐渐增大,但桩身的地震反应逐渐减小;承台侧向回填土的密实程度对城市曲线匝道桥下部结构塑性铰的产生机制影响较大。
In view of the structural characteristics of urban curved ramp bridges and taken a real bridge engineering as project background,the influence of different stiffnesses of lateral soil beside pile caps on equivalent translational and rotational stiffnesses for low pile cap foundation was analyzed by using m-method.By adopting linear and nonlinear time history analysis,the effects of stiffness of lateral soil beside pile caps on structural elasticity,elasto-plastic seismic response and aseismatic performance were researched.The results show that(1) the influence of stiffness of lateral soil beside pile caps on tangential translational and rotational stiffnesses of pile foundations of urban curved ramp bridges is significant;(2) with the increase of stiffness of lateral soil beside pile caps,the seismic response of piers increases gradually,while the seismic response of pile shaft decreases gradually;(3) the effect of the compactness of backfill beside pile caps on the formation mechanism of plastic hinge in the substructure of urban curved ramp bridges is significant.
In view of the structural characteristics of urban curved ramp bridges and taken a real bridge engineering as project background,the influence of different stiffnesses of lateral soil beside pile caps on equivalent translational and rotational stiffnesses for low pile cap foundation was analyzed by using m-method.By adopting linear and nonlinear time history analysis,the effects of stiffness of lateral soil beside pile caps on structural elasticity,elasto-plastic seismic response and aseismatic performance were researched.The results show that(1) the influence of stiffness of lateral soil beside pile caps on tangential translational and rotational stiffnesses of pile foundations of urban curved ramp bridges is significant;(2) with the increase of stiffness of lateral soil beside pile caps,the seismic response of piers increases gradually,while the seismic response of pile shaft decreases gradually;(3) the effect of the compactness of backfill beside pile caps on the formation mechanism of plastic hinge in the substructure of urban curved ramp bridges is significant.
引文
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[6]叶爱君,张喜刚,刘伟岸.河床冲刷深度变化对大型桩基桥梁地震反应的影响[J].土木工程学报,2007,40(3):58-62.YE Aijun,ZHANG Xigang,LIU Weian.Effects of Riverbed Scouring Depth on the Seismic Response of Bridges on Pile Foundations[J].China Civil Engineering Journal,2007,40(3):58-62.
[7]周敉,王君杰,袁万城,等.基于精细有限元分析的猎德大桥抗震性能评价[J].同济大学学报:自然科学版,2008,36(2):143-148.ZHOU Mi,WANG Junjie,YUAN Wancheng,et al.Seismic Performance Assessment of Liede Bridge Based on Detailed Finite Element Analysis[J].Journal of Tongji University:Natural Science Edition,2008,36(2):143-148.
[8]戚玉亮,冯紫良,余俊,等.泰州大桥北塔群桩基础三维动力非线性抗震计算研究[J].岩石力学与工程学报,2010,29(增1):3071-3081.QI Yuliang,FENG Ziliang,YU Jun,et al.Research on 3D Dynamic Nonlinear Aseismic Calculation of Pile Group Foundation of North Tower of Taizhou Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(S1):3071-3081.
[9]叶爱君,鲁传安.基于Pushover分析的群桩基础抗震性能分析方法[J].土木工程学报,2010,43(2):88-94.YE Aijun,LU Chuan’an.A Seismic Performance Analysis Approach Based on Pushover Analysis for GroupPile Foundations[J].China Civil Engineering Journal,2010,43(2):88-94.
[10]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].JTG/T B02-01—2008,Guidelines for Seismic Design of Highway Bridges[S].
[11]李克钏.基础工程[M].北京,中国铁道出版社,1995.LI Kechuan.Foundation Engineering[M].Beijing:China Railway Publishing House,1995.
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京,人民交通出版社,2001.FAN Lichu,HU Shide,YE Aijun.Seismic Design of Long-span Bridges[M].Beijing:China Communications Press,2001.
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