地震载荷下桩-土-上部结构作用机理与数值模拟
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摘要
桩-土-结构动力相互作用机理研究是提高动力作用下桩基础安全性的重要基础。在分析目前桩基抗震的主要计算模型及分析方法基础上,采用有限元软件ABAQUS,对桩-土-结构动力相互作用体系进行了水平地震荷载下的二维弹塑性有限元分析。比较了角桩、中间桩和中间边桩的剪应力幅值沿桩身的分布,得出了桩身剪应力幅值分布都呈桩顶大、桩尖小的倒三角分布;角桩剪应力幅值较大,边排中桩和中桩的剪应力幅值较小;随着桩间距的增大以及桩边长的减小,不同位置处的桩所分担的剪应力比例差距越来越小;桩土之间的滑移量在桩顶处大,桩尖处滑移量小;桩-土接触界面在动力作用过程中桩顶剪应力幅值有增大-减小-增大的变化规律。
Mechanism research of the dynamic interaction of pile-soil is an important basis of the safety of pile foundation.Through analyzing mail calculation models and analysis methods of anti-seismic pile foundation,based on finite element software ABAQUS,two-dimensional elastic-plastic finite element analysis of dynamic interaction of pile-soil mechanism was done under horizontal earthquake action After calculation,the distribution of the shear stress amplitude along the pile was obtained and some valuable conclusions were drawn.In general,the distribution of shear stress amplitude along the pile is inverse-triangle;the cornerpile has the maximum shear stress;the difference that different piles endure the shear stress reduces as the space among piles increases.The pile's sliding is large at the top of the pile and small at the tip of the pile.The distribution of shear stress amplitude is also variational along the pile.
Mechanism research of the dynamic interaction of pile-soil is an important basis of the safety of pile foundation.Through analyzing mail calculation models and analysis methods of anti-seismic pile foundation,based on finite element software ABAQUS,two-dimensional elastic-plastic finite element analysis of dynamic interaction of pile-soil mechanism was done under horizontal earthquake action After calculation,the distribution of the shear stress amplitude along the pile was obtained and some valuable conclusions were drawn.In general,the distribution of shear stress amplitude along the pile is inverse-triangle;the cornerpile has the maximum shear stress;the difference that different piles endure the shear stress reduces as the space among piles increases.The pile's sliding is large at the top of the pile and small at the tip of the pile.The distribution of shear stress amplitude is also variational along the pile.
引文
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[2]WOLF J P.Foundation vibration analysis using simple physical models[M].PTR Prenticc Hall Englcwood Cliffs,1995:341-377.
[3]林皋.土-结构动力相互作用[J].世界地震工程,1991,(1):4-36.
[4]PENZIEN J,SCHEFFY C.Seismic analysis of bridge on long piles[J].Engng Mech Div,ASCE,1964,90(EM3):223-254.
[5]杨伟林,陈国兴,土志华.深厚场地上特大桥墩-群桩-土相互作用体系地震反应特性的二维和二维分析[J].地震工程与工程振动,2003,23(6):124-132.
[6]刘立平.桩土结构相互作用弹塑性地震反应分析[J].地震工程与工程振动,2004,20(4):160-165.
[7]李辉.土-结动力相h.作用[D].重庆建筑大学,1999:63-68,40-41,43-50.
[8]TAKEWAKI I.Inverse stiffness design of shear flexuml building models including soil-structure interaction[J].EngineeringStructures,1999,(21):1045-1054.
[9]IDRISS I M H B,SERFF N.Seismic response by variable damping finite elements[J].Geotechnical Engineering,ASCE,1974,100(1):1-13.
[10]赵西安.钢筋混凝土高层建筑结构设讯[M].北京:中国建筑工业出版社,1992:203,204.
[11]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989:211,212.
[12]胡人礼.桥梁桩基础分析和设训-[M].北京:中国铁道出版社,1987:86-161.
[13]FINN W D L,WU C,TBAVARAJ T.Soil-pile-structure interaction proceedings of seismic analysis and design for soil-pile-structure interaction CJ[M].Mi-nneapolis,Minnesota,1997,1-20.
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