柔性承台下完全和部分埋入群桩的竖向振动及内力分析
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摘要
基于简化的完全和部分埋入群桩动力计算模型,采用有限元子结构方法,提出可以考虑承台板对群桩动力阻抗贡献的计算方法,并对均质地基和层状地基中不同桩间距条件下,承台板厚度对群桩动力阻抗的影响给予分析,详细讨论承台板惯性力的变化对群桩动力特性的影响,指出刚性承台假定的局限性。然后重点研究不同承台板厚度条件下群桩内力的分布规律。最后通过对群桩现场试验和海上风机基础动力特性的模拟,并与传统的计算方法和试验结果进行对比,说明计算方法可以更为合理、准确地预测群桩的动力响应及其变化趋势。
A simplified analytical method was developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits.Based on BDWF model,finite element sub-structure method was used to setup the dynamic model of cap-pile groups which could precisely simulate cap's influence on impedance of pile groups.A comprehensive parameter study was focused the influence of the caps' height and mass density on pile groups dynamic response,and then limitation of rigid cap in practical design was presented.A solution was finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction.The solution of present method was compared with that of traditional simplified method(rigid and massless cap solution) in simulating an in-site experiments of totally embedded pile groups and dynamics response of partially embedded pile groups for offshore fan foundation under harmonic load,it is demonstrated that present one can predict the pile groups dynamics response more reasonable and reliable.
A simplified analytical method was developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits.Based on BDWF model,finite element sub-structure method was used to setup the dynamic model of cap-pile groups which could precisely simulate cap's influence on impedance of pile groups.A comprehensive parameter study was focused the influence of the caps' height and mass density on pile groups dynamic response,and then limitation of rigid cap in practical design was presented.A solution was finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction.The solution of present method was compared with that of traditional simplified method(rigid and massless cap solution) in simulating an in-site experiments of totally embedded pile groups and dynamics response of partially embedded pile groups for offshore fan foundation under harmonic load,it is demonstrated that present one can predict the pile groups dynamics response more reasonable and reliable.
引文
[1]Kaynia A M,Kausel E.Dynamic Stiffness and Seismic Responseof Pile Groups[R].Cambridge,Mass,USA:Dept.of CivilEngineering,MIT,1982.
[2]Roesset J M.Dynamic Stiffness of Pile Groups[J].PileFoundations,Special Publication,ASCE,1984,10:263-286.
[3]Novak M.Piles Under Dynamic Loads:State of Art[C]//Proc,2nd International Conference on Recent Advances in GeotechnicalEarthquake Engineering and Soil Dynamics.1991,3:2433-2456.
[4]Pender M.Aseismic Pile Foundation Design Analysis[J].Bulletin of the New Zealand National Society for EarthquakeEngineering,1993,26(1):49-160.
[5]Padron L A,Aznarez J J,Maeso O.BEM-FEM Coupling Modelfor the Dynamic Analysis of Piles and Pile Groups[J].Engineering Analysis with Boundary Elements,2007,31:473-484.
[6]Padron L A,Aznarez J J,Maeso O.Dynamic Analysis of PiledFoundations in Stratified Soils by a BEM-FEM Model[J].SoilDynamics and Earthquake Engineering,2008,28(5):333-346.
[7]Gazetas G,Makris N.Dynamic Pile-Soil-Pile Interaction:Part I:Analysis of Axial Vibration[J].Earthquake Engineering andStructure Dynamics,1991,20:115-132.
[8]Mylonakis G,Gazetas G.Vertical Vibration and AdditionalDistress of Pile Groups in Layered Soil[J].Soils andFoundations,1998,38(1):1-14.
[9]任青,黄茂松,钟锐,等.部分埋入群桩的竖向振动特性[J].岩土工程学报,2009,31(9):1465-1473.
[10]GB 50007—2002建筑地基基础设计规范[S].
[11]Hassini S,Woods R D.Dynamic Experiments with Model PileFoundations[C]//Proc.12th International Conference on SoilMechanics and Foundation Engineering.1989,12:1135-1158.
[12]Iguchi M,Luco J E.Vibration of Flexible Plate on ViscoelasticMedium[J].Journal of Engineering Mechanics,ASCE,1982,108(6):1103-1120.
[13]Liou G S,Huang Paohan.Effect of Flexibility on ImpedanceFunctions for Circular Foundation[J].Journal of EngineeringMechanics,ASCE,1994,120(7):1429-1446.
[14]Mamoon Saifuddin M.Dynamics and Seismic Behavior of DeepFoundations[D].Buffalo,New York,USA:State University ofNew York at Buffalo,1991.
[15]Fukuwa N,Wen Xuezhang.Efficient Soil-Structure InteractionAnalysis Method of a Large-Scale Pile Group[C]//Proc.4th US-Japan Workshop on Soil-Structure Interaction.2007:1-13.
[16]王勖成.有限单元法[M].北京:清华大学出版社,2002.
[17]侯兴民.基础动力阻抗矩阵数值解答及其工程应用[D].哈尔滨:中国地震局工程力学研究所,2003.
[18]Nogami T,Novak M.Soil-Pile Interaction in Vertical Vibration[J].Earthquake Engineering and Structural Dynamics,1976,4:277-293.
[19]Dobry R,Gazetas G.Simple Method for Dynamic Stiffness andDamping of Floating Pile Groups[J].Geotechnique,1988,38(4):557-574.
[20]陈镕,蒋振华,薛松涛,等.桩-承台竖向强迫振动试验和分析[J].同济大学学报,2004,32(7):846-850.
[2]Roesset J M.Dynamic Stiffness of Pile Groups[J].PileFoundations,Special Publication,ASCE,1984,10:263-286.
[3]Novak M.Piles Under Dynamic Loads:State of Art[C]//Proc,2nd International Conference on Recent Advances in GeotechnicalEarthquake Engineering and Soil Dynamics.1991,3:2433-2456.
[4]Pender M.Aseismic Pile Foundation Design Analysis[J].Bulletin of the New Zealand National Society for EarthquakeEngineering,1993,26(1):49-160.
[5]Padron L A,Aznarez J J,Maeso O.BEM-FEM Coupling Modelfor the Dynamic Analysis of Piles and Pile Groups[J].Engineering Analysis with Boundary Elements,2007,31:473-484.
[6]Padron L A,Aznarez J J,Maeso O.Dynamic Analysis of PiledFoundations in Stratified Soils by a BEM-FEM Model[J].SoilDynamics and Earthquake Engineering,2008,28(5):333-346.
[7]Gazetas G,Makris N.Dynamic Pile-Soil-Pile Interaction:Part I:Analysis of Axial Vibration[J].Earthquake Engineering andStructure Dynamics,1991,20:115-132.
[8]Mylonakis G,Gazetas G.Vertical Vibration and AdditionalDistress of Pile Groups in Layered Soil[J].Soils andFoundations,1998,38(1):1-14.
[9]任青,黄茂松,钟锐,等.部分埋入群桩的竖向振动特性[J].岩土工程学报,2009,31(9):1465-1473.
[10]GB 50007—2002建筑地基基础设计规范[S].
[11]Hassini S,Woods R D.Dynamic Experiments with Model PileFoundations[C]//Proc.12th International Conference on SoilMechanics and Foundation Engineering.1989,12:1135-1158.
[12]Iguchi M,Luco J E.Vibration of Flexible Plate on ViscoelasticMedium[J].Journal of Engineering Mechanics,ASCE,1982,108(6):1103-1120.
[13]Liou G S,Huang Paohan.Effect of Flexibility on ImpedanceFunctions for Circular Foundation[J].Journal of EngineeringMechanics,ASCE,1994,120(7):1429-1446.
[14]Mamoon Saifuddin M.Dynamics and Seismic Behavior of DeepFoundations[D].Buffalo,New York,USA:State University ofNew York at Buffalo,1991.
[15]Fukuwa N,Wen Xuezhang.Efficient Soil-Structure InteractionAnalysis Method of a Large-Scale Pile Group[C]//Proc.4th US-Japan Workshop on Soil-Structure Interaction.2007:1-13.
[16]王勖成.有限单元法[M].北京:清华大学出版社,2002.
[17]侯兴民.基础动力阻抗矩阵数值解答及其工程应用[D].哈尔滨:中国地震局工程力学研究所,2003.
[18]Nogami T,Novak M.Soil-Pile Interaction in Vertical Vibration[J].Earthquake Engineering and Structural Dynamics,1976,4:277-293.
[19]Dobry R,Gazetas G.Simple Method for Dynamic Stiffness andDamping of Floating Pile Groups[J].Geotechnique,1988,38(4):557-574.
[20]陈镕,蒋振华,薛松涛,等.桩-承台竖向强迫振动试验和分析[J].同济大学学报,2004,32(7):846-850.
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