高桩承台基础群桩等效嵌固长度参数分析
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摘要
从高桩承台基础等效体系和原型基本周期相等的原理出发,采用弹性地基反力法考虑桩-土相互作用,通过幂级数法求解侧向荷载下桩的挠曲微分方程,提出了一种求解高桩承台基础在侧向荷载作用下等效嵌固长度的解析方法;分析了土层、桩径与桩距比、桩柱抗推刚度比等参数对桩基础等效嵌固长度的影响规律,并给出了具有实用性的高桩承台桩基等效嵌固长度简化公式。结果表明:土层性质和桩、柱抗推刚度比是决定高桩承台桩基础等效嵌固长度的主要因素;研究成果可简化群桩基础模型,同时兼顾上部结构响应的精度,为桥梁概念设计提供依据。
Calculation model of equivalent anchorage length for elevated pile caps under lateral load was proposed based on the invariability of basic period.Pile-soil interaction was considered by elastic subgrade reaction method and using the power series method to solve the curve differential equation.Variety rules of anchorage length for elevated pile caps with the changes of soil properties,diameter-spacing ratio of pile,pile-pier stiffness ratio etc were studied.The empirical equation of pile equivalent fixed length for elevated pile caps under lateral load was given.The main factors affecting the equivalent anchorage length of pile consist of soil properties and pile-pier stiffness ratio.So this study can provide a simplified model for pile group foundation which could simplify calculation and guarantee the calculation precision,the research results can be used for conceptual design of bridges.1 tab,7 figs,14 refs.
Calculation model of equivalent anchorage length for elevated pile caps under lateral load was proposed based on the invariability of basic period.Pile-soil interaction was considered by elastic subgrade reaction method and using the power series method to solve the curve differential equation.Variety rules of anchorage length for elevated pile caps with the changes of soil properties,diameter-spacing ratio of pile,pile-pier stiffness ratio etc were studied.The empirical equation of pile equivalent fixed length for elevated pile caps under lateral load was given.The main factors affecting the equivalent anchorage length of pile consist of soil properties and pile-pier stiffness ratio.So this study can provide a simplified model for pile group foundation which could simplify calculation and guarantee the calculation precision,the research results can be used for conceptual design of bridges.1 tab,7 figs,14 refs.
引文
[1]周敉.高桩承台桥梁抗震性能试验和理论研究[D].上海:同济大学,2009.
[2]马志涛.水平荷载下桩基受力特性研究综述[J].河海大学学报:自然科学版,2006,34(5):546-551.MA Zhi-tao.Study on behavior of pile foundation un-der lateral loading[J].Journal of Hehai University:Natural Science Edition,2006,34(5):546-551.
[3]任文峰,王星华,韩晓飞.火山灰沉积地区桩基承载力试验[J].长安大学学报:自然科学版,2009,29(6):59-63.REN Wen-feng,WANG Xing-hua,HAN Xiao-fei.Test on bearing capacity of bored pile in pozzolanasediment area[J].Journal Chang an University:Natu-ral Science Edition,2009,29(6):59-63.
[4]胡琦忠,金伟良,史方华,等.大型跨海桥梁基础结构正常使用极限状态的可靠度分析[J].中国公路学报,2008,21(1):53-58.HU Qi-zhong,JIN Wei-liang,SHI Fang-hua,et al.Reliability analysis of foundation structures of off-shore long-span-bridges on serviceability limit states[J].China Journal of Highway and Transport,2008,21(1):53-58.
[5]冯忠居,谢永利,李哲,等.大直径超长钻孔灌注桩承载性状[J].交通运输工程学报,2005,5(1):24-27.FENG Zhong-ju,XIE Yong-li,LI Zhe,et al.Bearingproperty of large-diameter over-length nonplacementpile[J].Journal of Traffic and Transportation Engi-neering,2005,5(1):24-27.
[6]Murat D.Integral abutment-backfill behavior on sandsoil-pushover analysis approach[J].Journal of BridgeEngineering,2005,10(3):354-364.
[7]Chen Y.Assessment on pile effective lengths andtheir effects on design-I.assessment[J].Computers&Structures,1997,62(2):265-286.
[8]NCHRP REPORT 489.Design of highway bridgesfor extreme events[R].Washington DC:Transporta-tion Research Board,2003.
[9]刘伟岸,叶爱君,王斌斌.大跨度桥梁桩基抗震简化模式的分析与探讨[J].结构工程师,2007,23(1):51-55.LIU Wei-an,YE Ai-jun,WANG Bin-bin.Discussionon seismic simplified modes of pile foundation inlong-span bridge[J].Structural Engineers,2007,23(1):51-55.
[10]杨昌众.桩基桥梁的场地判别和地震反应计算的实用简化方法[D].上海:同济大学,1987.
[11]燕斌.桥梁桩基础抗震简化模型比较研究[D].上海:同济大学,2007.
[12]Harry G P.Approximate computer analysis of pilegroups subjected to loads and ground movements[J].International Journal for Numerical and AnalyticalMethods in Geomechanics,1999,23(10):1021-1041.
[13]Rollins K M,Gerber T M,Lane J D,et al.Lateral re-sistance of a full-scale pile group in liquefied sand[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2005,131(1):115-125.
[14]胡人礼.桥梁桩基分析和设计[M].北京:中国铁道出版社,1987.
[2]马志涛.水平荷载下桩基受力特性研究综述[J].河海大学学报:自然科学版,2006,34(5):546-551.MA Zhi-tao.Study on behavior of pile foundation un-der lateral loading[J].Journal of Hehai University:Natural Science Edition,2006,34(5):546-551.
[3]任文峰,王星华,韩晓飞.火山灰沉积地区桩基承载力试验[J].长安大学学报:自然科学版,2009,29(6):59-63.REN Wen-feng,WANG Xing-hua,HAN Xiao-fei.Test on bearing capacity of bored pile in pozzolanasediment area[J].Journal Chang an University:Natu-ral Science Edition,2009,29(6):59-63.
[4]胡琦忠,金伟良,史方华,等.大型跨海桥梁基础结构正常使用极限状态的可靠度分析[J].中国公路学报,2008,21(1):53-58.HU Qi-zhong,JIN Wei-liang,SHI Fang-hua,et al.Reliability analysis of foundation structures of off-shore long-span-bridges on serviceability limit states[J].China Journal of Highway and Transport,2008,21(1):53-58.
[5]冯忠居,谢永利,李哲,等.大直径超长钻孔灌注桩承载性状[J].交通运输工程学报,2005,5(1):24-27.FENG Zhong-ju,XIE Yong-li,LI Zhe,et al.Bearingproperty of large-diameter over-length nonplacementpile[J].Journal of Traffic and Transportation Engi-neering,2005,5(1):24-27.
[6]Murat D.Integral abutment-backfill behavior on sandsoil-pushover analysis approach[J].Journal of BridgeEngineering,2005,10(3):354-364.
[7]Chen Y.Assessment on pile effective lengths andtheir effects on design-I.assessment[J].Computers&Structures,1997,62(2):265-286.
[8]NCHRP REPORT 489.Design of highway bridgesfor extreme events[R].Washington DC:Transporta-tion Research Board,2003.
[9]刘伟岸,叶爱君,王斌斌.大跨度桥梁桩基抗震简化模式的分析与探讨[J].结构工程师,2007,23(1):51-55.LIU Wei-an,YE Ai-jun,WANG Bin-bin.Discussionon seismic simplified modes of pile foundation inlong-span bridge[J].Structural Engineers,2007,23(1):51-55.
[10]杨昌众.桩基桥梁的场地判别和地震反应计算的实用简化方法[D].上海:同济大学,1987.
[11]燕斌.桥梁桩基础抗震简化模型比较研究[D].上海:同济大学,2007.
[12]Harry G P.Approximate computer analysis of pilegroups subjected to loads and ground movements[J].International Journal for Numerical and AnalyticalMethods in Geomechanics,1999,23(10):1021-1041.
[13]Rollins K M,Gerber T M,Lane J D,et al.Lateral re-sistance of a full-scale pile group in liquefied sand[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2005,131(1):115-125.
[14]胡人礼.桥梁桩基分析和设计[M].北京:中国铁道出版社,1987.
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