基于非线性Pushover分析的单桩横向受力特性研究
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摘要
为了研究地基土以及桩身在进入非线性状态下的单桩水平极限承载能力及变形能力,采用分布塑性铰模型模拟桩身的弹塑性,以p-y曲线模拟桩侧地基土水平抗力,对固定桩头单桩基础进行了静力非线性推倒分析。结果表明:(1)桩身轴压比对结构水平极限承载能力及位移延性影响显著;(2)随着地基土抗剪强度的增大,桩顶极限位移减小,但水平极限承载能力增大;(3)提高桩身配箍率,桩顶极限位移增加较明显;(4)轴压比较小时,在桩头及地面以下桩身均可能产生塑性铰,但轴压比较大时,仅在桩头产生塑性铰。
In order to study the horizontal ultimate bearing and deformation capacity of pile under the condition of the nonlinearity of pile and subsoil,the plastic hinge distribution model is adopted to simulate the elastoplasticity of pile shaft,p-y curve is used to simulate the horizontal soil resistance of pile side soil,and non-linear static pushover analysis is performed on single pile with the boundary constraint at pile head.The result shows that(1) axial compressive ratio of pile shaft has a significant influence on the horizontal limit bearing capacity and displacement ductility of the structure;(2) with the increase of shear strength of foundation soil,the ultimate displacement of the pile top reduce,but the horizontal limit bearing capacity increases;(3) after incresing stirrup ratio of pile shaft,the ultimate displacement of the pile top increases greatly;(4) when axial compressive ratio is small,plasticity hinges maybe produced at the location of pile head and pile shaft below ground line,but when axial compressive ratio is larger,plasticity hinges will only generated at the location of pile head.
引文
[1]TB10002.5—2005,铁路桥涵地基和基础设计规范[S].TB 10002.5—2005,Code for Design on Subsoil and Foundation of Railway Bridge and Culvert[S].
    [2]陈兴冲,朱晞.允许提离的弹塑性Winkler地基上桥墩的地震反应[J].工程力学,1999,16(5):101-107.CHEN Xing-chong,ZHU Xi.Seismic Response of Bridge Piers on Elasto-plastic Winkler Foundation Allowed to Uplift[J].Engineering Mechanics,1999,16(5):101-107.
    [3]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 Li-chu,HU Shi-de,YE Ai-jun.Seismic Design of Long-span Bridges[M].Beijing:China Communications Press,2001.
    [4]日本の鉄道総合技術研究所.鉄道構造物などの設計基準及び解説V耐震設計[S].東京:丸善株式会社出版事業部,1999.Japan Railway Technical Research Institute.Seismic Design Standards and Explanations for Railway Structures[S].Tokyo:Publishing Department of Maruzen Co.,Ltd.,1999.
    [5]American Association of State Highway and Transportation Officials.AASHTO LRFD Bridge Design Specifications[S].Washington,D.C.:AASHTO,2009.
    [6]CHAI Y H.Flexural Strength and Ductility of Extended Pile-shafts.I:Analytical Model[J].Journal of Structural Engineering,2002,128(5):586-594.
    [7]HSIUN Y M,CHEN S S,CHOU Y C.Analytical Solution for Piles Supporting Combined Lateral Loads[J].Journal of Geotechnical and Geoenviromental Engineering,2006,132(10),1315-1324.
    [8]CHIOU J S,YANG H H,CHEN C H.Use of Plastic Hinge Model in Nonlinear Pushover Analysis of a Pile[J].Journal of Geotechnical and Geoenviromental Engineering,2009,135(9):1341-1346.
    [9]KAPPOS A J,SEXTOS A G.Effect of Foundation Type and Compliance on Seismic Response of RC Bridges[J].Journal of Bridge Engineering,2001,4(3):120-130.
    [10]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 Ai-jun,LU Chuan-an.A Seismic Performance Analysis Approach Based on Pushover Analysis for Group Pile Foundations[J].China Civil Engineering Journal,2010,43(2):88-94.
    [11]陈明山,段绍纬,黄永和,等.地震地区高速铁路桩基础设计考虑[J].岩土工程学报,2004,26(6):761-766.CHEN Ming-shan,DUAN Shao-wei,HUANG Yong-he,et al.Design Consideration of Pile Foundations of High Speed Rail Project in Seismic Area[J].Chinese Journal of Geotechnical Engineering,2004,26(6):761-766.
    [12]American Society of Civil Engineers.Prestandard and Commentary for the Seismic Rehabilitation of Buildings[S].Washington,D.C.:Federal Emergency Management Agency,2000.

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