刚性桩复合地基地震反应机理分析
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摘要
为研究刚性桩复合地基的抗震性能,用刚性桩复合地基振动台试验验证了所采用的等效线性方法及其参数取值,在此基础上针对实际问题进行了三维有限元分析,对地基分层、土体模量、桩径、桩长、垫层厚度和垫层模量等因素对复合地基地震反应的影响进行了分析讨论,对刚性桩复合地基在地震荷载作用下的工作机理进行了较详细的分析。结果表明,等效线性方法能较好地模拟结构-复合地基相互作用的特性;上部结构惯性力和自由场变形对复合地基桩身内力影响都较大;地基明显软硬分层的存在,会使桩身内力显著增大。
Concerning the aseismic ability of rigid pile composite foundation, the equivalent linear method and its parameter values are verified by shaking table tests of rigid pile composite foundation; some practical cases are analyzed by means of 3D finite element method. The effects of layered foundation, soil modulus, pile diameter and pile length, cushion thickness and cushion modulus etc. on the earthquake responses of rigid pile composite foundation are discussed; and the aseismic mechanism of rigid pile composite foundation is studied. It is found that the equivalent linear method can adequately simulate the characteristics of the interaction between structure and composite foundation; the inertia force of the superstructure and the deformation of the free field have notable impact on the inner forces in piles; the inner forces in piles tend to remarkably increase for the existence of weak layers in soil.
Concerning the aseismic ability of rigid pile composite foundation, the equivalent linear method and its parameter values are verified by shaking table tests of rigid pile composite foundation; some practical cases are analyzed by means of 3D finite element method. The effects of layered foundation, soil modulus, pile diameter and pile length, cushion thickness and cushion modulus etc. on the earthquake responses of rigid pile composite foundation are discussed; and the aseismic mechanism of rigid pile composite foundation is studied. It is found that the equivalent linear method can adequately simulate the characteristics of the interaction between structure and composite foundation; the inertia force of the superstructure and the deformation of the free field have notable impact on the inner forces in piles; the inner forces in piles tend to remarkably increase for the existence of weak layers in soil.
引文
[1]池跃君.刚性桩复合地基工作性能及沉降计算方法的研究[博士论文D].北京:清华大学,2002.
[2]徐自国.刚性桩复合地基抗震性能研究[硕士论文D].北京:清华大学,2003.
[3]刘光磊,武思宇,宋二祥.群桩刚性桩复合地基地震反应三维有限元分析[J].建筑结构,2006,36(7):85-90.LIU Guang-lei,WU Si-yu,SONG Er-xiang.3-D finite element analysis of seismic response of rigid piles composite foundation[J].Building Structure,2006,36(7):85-90
[4]IDRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundations,ASCE,1968,94(SM4):1003-1031.
[5]WU Guo-xi,FINN L W D.Dynamic nonlinear analysis of pile foundations using finite element method in the time domain[J].Can.Geotech.J.,1997,34:44-52.
[6]ANANDARAJAHA A,ZHANGA J,EALY C.Calibration of dynamic analysis methods from field test data[J].Soil Dynamics and Earthquake Engineering,2005,(25):763-772.
[7]陈波.桩-土-结构动力相互作用系统的模拟与分析[博士论文D].上海:同济大学结构工程和防灾减灾研究所,2002.
[8]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77-82.WU Si-yu,SONG Er-xiang,LIU Hua-bei,et al.Shaking table test study on aseismic behavior of rigid pile composite foundation[J].Rock and Soil Mechanics,2007,28(1):77-82.
[9]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-138.YUAN Xiao-ming,SUN yue,SUN Jing,et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2000,20(4):133-138.
[10]朱国祥.土层地震反应分析中不同参数的敏感性分析[J].工程抗震,2004,(6):28-32.ZHU Guo-xiang.Sensitivity of different parameters applied in seismic analysis of multi-layer soil models[J].Earthquake Resistant Engineering,2004,(6):28-32.
[11]何兆益,黄卫,邓学钧.级配碎石弹性模量的动三轴试验研究[J].东南大学学报,1997,27(13):36-39.HE Zhao-yi,HUANG Wei,DENG Xue-jun.Dynamic resilient moduli of granular materials[J].Journal of Southeast University,1997,27(13):36-39.
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[14]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002:210-213.
[15]刘惠珊.桩基震害及原因分析--日本阪神大地震的启示[J].工程抗震,1999,(3):37-43.LIU Hui-shan.A case analysis of earthquake damage of pile foundations[J].Earthquake Resistant Engineering,1999,(3):37-43.
[16]POULOS H,DAVIS E.Pile Foundation Analysis and Design[M].New York:John Wiley and Sons,1980.
[17]阎明礼,刘国安,杨军,等.水平荷载作用下CFG桩复合地基的性状[J].建筑科学,1994,(4):27-31.YAN Min-li,LIU Guo-an,YANG Jun,et al.Behavior of rigid pile composite foundation under horizontal load[J].Building Science,1994,(4):27-31.
[2]徐自国.刚性桩复合地基抗震性能研究[硕士论文D].北京:清华大学,2003.
[3]刘光磊,武思宇,宋二祥.群桩刚性桩复合地基地震反应三维有限元分析[J].建筑结构,2006,36(7):85-90.LIU Guang-lei,WU Si-yu,SONG Er-xiang.3-D finite element analysis of seismic response of rigid piles composite foundation[J].Building Structure,2006,36(7):85-90
[4]IDRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundations,ASCE,1968,94(SM4):1003-1031.
[5]WU Guo-xi,FINN L W D.Dynamic nonlinear analysis of pile foundations using finite element method in the time domain[J].Can.Geotech.J.,1997,34:44-52.
[6]ANANDARAJAHA A,ZHANGA J,EALY C.Calibration of dynamic analysis methods from field test data[J].Soil Dynamics and Earthquake Engineering,2005,(25):763-772.
[7]陈波.桩-土-结构动力相互作用系统的模拟与分析[博士论文D].上海:同济大学结构工程和防灾减灾研究所,2002.
[8]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77-82.WU Si-yu,SONG Er-xiang,LIU Hua-bei,et al.Shaking table test study on aseismic behavior of rigid pile composite foundation[J].Rock and Soil Mechanics,2007,28(1):77-82.
[9]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-138.YUAN Xiao-ming,SUN yue,SUN Jing,et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2000,20(4):133-138.
[10]朱国祥.土层地震反应分析中不同参数的敏感性分析[J].工程抗震,2004,(6):28-32.ZHU Guo-xiang.Sensitivity of different parameters applied in seismic analysis of multi-layer soil models[J].Earthquake Resistant Engineering,2004,(6):28-32.
[11]何兆益,黄卫,邓学钧.级配碎石弹性模量的动三轴试验研究[J].东南大学学报,1997,27(13):36-39.HE Zhao-yi,HUANG Wei,DENG Xue-jun.Dynamic resilient moduli of granular materials[J].Journal of Southeast University,1997,27(13):36-39.
[12]中国建筑科学院.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[13]中国建筑科学院.GB50009-2001建筑结构荷载规范[S].北京:中国建筑工业出版社,2002.
[14]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002:210-213.
[15]刘惠珊.桩基震害及原因分析--日本阪神大地震的启示[J].工程抗震,1999,(3):37-43.LIU Hui-shan.A case analysis of earthquake damage of pile foundations[J].Earthquake Resistant Engineering,1999,(3):37-43.
[16]POULOS H,DAVIS E.Pile Foundation Analysis and Design[M].New York:John Wiley and Sons,1980.
[17]阎明礼,刘国安,杨军,等.水平荷载作用下CFG桩复合地基的性状[J].建筑科学,1994,(4):27-31.YAN Min-li,LIU Guo-an,YANG Jun,et al.Behavior of rigid pile composite foundation under horizontal load[J].Building Science,1994,(4):27-31.
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