桩-土接触效应及对桥梁结构地震反应的影响
|
摘要
目前有关涉及桥梁桩基础地震反应的研究大多是基于桩与桩侧土体之间无相对滑动、位移保持协调的假定。本文针对地震作用下桥梁桩基础的接触面效应及其对结构地震反应的影响问题,以某桥梁工程为背景,通过在桩-土交界面处设置接触单元来模拟桩-土间的接触非线性,建立了土-桩-桥梁结构相互作用体系的三维分析模型。利用这一模型,分析了地震作用下桩-土交界面处的动力反应形态,探讨了桩-土间的接触非线性及其对桥梁结构地震反应的影响。初步分析结果表明:在强震作用下,桩-土间会产生较强的接触非线性,在本文模型中,这种非线性主要表现为桩-土交界面处的滑移;考虑桩-土间的接触面效应将使结构的位移反应结果较基于桩-土间位移协调的情形有所增大。
The effect of pile soil contact and its influence on seismic response of bridge structure were investigated by the engineering background of an actual bridge. The 3D model of soil pile superstructure interaction system was established by using finite element method, and the interface element was used to model the interface behavior between soil and pile materials. The motion behavior at the interface of pile soil under seismic loading was analyzed, and its influence on the displacement response of pile footing and superstructure was also discussed. It is shown that the interface of pile soil would appear contact non-linearity under strong shock loading.
The effect of pile soil contact and its influence on seismic response of bridge structure were investigated by the engineering background of an actual bridge. The 3D model of soil pile superstructure interaction system was established by using finite element method, and the interface element was used to model the interface behavior between soil and pile materials. The motion behavior at the interface of pile soil under seismic loading was analyzed, and its influence on the displacement response of pile footing and superstructure was also discussed. It is shown that the interface of pile soil would appear contact non-linearity under strong shock loading.
引文
[1]袁万城．大跨桥梁空间非线性地震反应分析[D]．[博士学位论文],同济大学,1990．
[2]汤永净,丁春林．周顺华．布谷孜大桥地基与基础地震反应分析[J]．工程力学,1998,增刊:304-309．
[3] Novak M. Pile under dynamic loads [A]. Proc. 2nd Int. Conf. Recent Advances in Geotech. Earthq. Eng. &Soil Dyn. [C]. St. Louis, Missouri (USA), 1991(3):250- 273.
[4]何君毅,林祥都．工程结构非线性问题的数值解法[M]．北京:国防工业出版社,1994．
[5] Zhu C M. The solution of frictional contact problems using a finite element-mathematical programming method [J]. Computers & Structures, 1994, 52(1) : 149-155.
[6] ANSYS Theory Reference (Eighth Edition) [R]. USA: SAS IP, Inc, 1997.
[7]刘海笑,周锡礽．结构地震反应分析中接触面问题的处理[J]．天津大学学报,2000,33(1):41-43．
[8]赵云峰．不同基础形式下土．结构动力相互作用的数值研究[D]．[硕士学位论文],同济大学,2000．
[2]汤永净,丁春林．周顺华．布谷孜大桥地基与基础地震反应分析[J]．工程力学,1998,增刊:304-309．
[3] Novak M. Pile under dynamic loads [A]. Proc. 2nd Int. Conf. Recent Advances in Geotech. Earthq. Eng. &Soil Dyn. [C]. St. Louis, Missouri (USA), 1991(3):250- 273.
[4]何君毅,林祥都．工程结构非线性问题的数值解法[M]．北京:国防工业出版社,1994．
[5] Zhu C M. The solution of frictional contact problems using a finite element-mathematical programming method [J]. Computers & Structures, 1994, 52(1) : 149-155.
[6] ANSYS Theory Reference (Eighth Edition) [R]. USA: SAS IP, Inc, 1997.
[7]刘海笑,周锡礽．结构地震反应分析中接触面问题的处理[J]．天津大学学报,2000,33(1):41-43．
[8]赵云峰．不同基础形式下土．结构动力相互作用的数值研究[D]．[硕士学位论文],同济大学,2000．
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心