简易桥墩基础之地震反应分析
|
摘要
建议以间接分析法将完整之土壤和桥墩基础拆解成个别之子结构系统,并依叠加概念分别诠释不同子结构行为模式,最后加总各系统行为以仿真整体结构反应。研究首先利用集中质块分析法建立自由场受震之位移,并以此为前置解代入桩基础波动方程分析,求解基桩受震反应。上部桥梁结构则简化为双自由度质块系统纳入分析,以上部结构和地下桩基础间之传递力为收敛依据,逐次修正系统变形量,并仿真隔震设施功效。该项分析经与有限元素法结果比较证明可行,且可节省大量分析时间。
This study represented a simplified analysis for the bridge pier foundation system.The structural system was decomposed into substructures where the corresponding individual responses were solved and integrated to obtain the results.To obtain the solution,the seismic free-field response of the site was computed from the lumped-mass analysis,and the soil deformations were then imposed onto the foundation to conduct the wave equation analysis.The superstructure was modeled as a two DOF systems as mounted in the surface of the foundation,and due isolations of the structure was simulated.The transmitting forces between the structure and the foundation were iteratively checked until the equilibrium of the system was ensured.The solutions were verified with the FEM analysis.Substantial amount of computation time could be reduced.
This study represented a simplified analysis for the bridge pier foundation system.The structural system was decomposed into substructures where the corresponding individual responses were solved and integrated to obtain the results.To obtain the solution,the seismic free-field response of the site was computed from the lumped-mass analysis,and the soil deformations were then imposed onto the foundation to conduct the wave equation analysis.The superstructure was modeled as a two DOF systems as mounted in the surface of the foundation,and due isolations of the structure was simulated.The transmitting forces between the structure and the foundation were iteratively checked until the equilibrium of the system was ensured.The solutions were verified with the FEM analysis.Substantial amount of computation time could be reduced.
引文
[1]SMITH E A L.Pile driving analysis by the wave equation[J].Journal of Soil Mechanics and Foundation Divisions,ASCE,1960,86(SM4):35–61.
[2]NOVAK M,EI Sharnouby B.Stiffness and damping constants of single piles[J].Journal of Geotechnical Engineering Division,ASCE,1983,109(GT7):153–168.
[3]CHANG D W,ROESSET J M,WEN C H.A time-domain viscous damping model based on frequency-depend damping ratios[J].Soil Dynamic and Earthquake Engineering,2000,19:551–558.
[4]温展华.垂直群桩反应数值解比较研究[D].台湾:淡江大学,2000.(WEN Chan-hua.Comparative study on numerical solutions of vertically loaded group-pile[D].Taiwan:Tamkang University,2000.)
[5]王志炜.侧向地震桩基之波动方程分析[D].台湾:淡江大学,2002.(WANG Jr-wei.Wave equation analysis on lateral earthquake motions of pile foundations[D].Taiwan:Tamkang University,2002.)
[6]IDRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,ASCE,1968,94(SM4):1003–1031.
[7]ROESSET J M,WHITMAN R V.Theoreetical backgroud for amplification studies[R].MIT Res Rep R69–15,1969.
[8]郑世豪.简易桥墩基础之地震反应分析[D].台湾:淡江大学,2004.(CHENG Shih-hao,Seismic response analysis for simplified bridge-pier-foundations[D].Taiwan:Tamkang University,2004.)
[9]REESE L C.Executive summary,behavior of piles and pile groups under lateral load[R].U S Department of Transportation Federal Highway Administration Office of Research Washington,1983.
[10]CHANG D W,YEH S H.Time-domain wave equation analysis of single piles utilizing transformed radiation damping[J].Soils and foundations,JGS,1999,39,(2):31–44.
[11]DOBRY R,GAZETAS G.Simple method for dynamic stiffness and damping of floating pile groups[J].Geotechnique 1988,38(4):557–574.
[12]GAZETAS G.Formulas and charts for impedances of surface and embedded foundations[J].Journal of Geotechnical Engineering,1991,117(9):1368–1381.
[13]林光宗.群桩互制效应对基桩反应之影响[D].台湾:淡江大学,1998.(LIN Guang-tzung,Group-pile interaction effects on single pile response[D].Taiwan:Tamkang University,1998.)
[14]张一郎.波动方程式分析于群桩侧向反应之应用[D].台湾:淡江大学,2000.(CHANG I-lang.Application of wave equation analysis on laterally loaded group-pile[D].Taiwan:Tamkang University,2000.)
[15]VASANT A M,JANGID R S.Seismic response of base-isolated structures during impact with adjacement structures[J].Engineering Structures,2003,25:1311–1323.
[16]DANIEL O,DORA F,LUIS B.Comparative of the inlastic response of base isolated buildings[J].Earthquake Engineering and Structural Dynamics,2003,32:151–164.
[2]NOVAK M,EI Sharnouby B.Stiffness and damping constants of single piles[J].Journal of Geotechnical Engineering Division,ASCE,1983,109(GT7):153–168.
[3]CHANG D W,ROESSET J M,WEN C H.A time-domain viscous damping model based on frequency-depend damping ratios[J].Soil Dynamic and Earthquake Engineering,2000,19:551–558.
[4]温展华.垂直群桩反应数值解比较研究[D].台湾:淡江大学,2000.(WEN Chan-hua.Comparative study on numerical solutions of vertically loaded group-pile[D].Taiwan:Tamkang University,2000.)
[5]王志炜.侧向地震桩基之波动方程分析[D].台湾:淡江大学,2002.(WANG Jr-wei.Wave equation analysis on lateral earthquake motions of pile foundations[D].Taiwan:Tamkang University,2002.)
[6]IDRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,ASCE,1968,94(SM4):1003–1031.
[7]ROESSET J M,WHITMAN R V.Theoreetical backgroud for amplification studies[R].MIT Res Rep R69–15,1969.
[8]郑世豪.简易桥墩基础之地震反应分析[D].台湾:淡江大学,2004.(CHENG Shih-hao,Seismic response analysis for simplified bridge-pier-foundations[D].Taiwan:Tamkang University,2004.)
[9]REESE L C.Executive summary,behavior of piles and pile groups under lateral load[R].U S Department of Transportation Federal Highway Administration Office of Research Washington,1983.
[10]CHANG D W,YEH S H.Time-domain wave equation analysis of single piles utilizing transformed radiation damping[J].Soils and foundations,JGS,1999,39,(2):31–44.
[11]DOBRY R,GAZETAS G.Simple method for dynamic stiffness and damping of floating pile groups[J].Geotechnique 1988,38(4):557–574.
[12]GAZETAS G.Formulas and charts for impedances of surface and embedded foundations[J].Journal of Geotechnical Engineering,1991,117(9):1368–1381.
[13]林光宗.群桩互制效应对基桩反应之影响[D].台湾:淡江大学,1998.(LIN Guang-tzung,Group-pile interaction effects on single pile response[D].Taiwan:Tamkang University,1998.)
[14]张一郎.波动方程式分析于群桩侧向反应之应用[D].台湾:淡江大学,2000.(CHANG I-lang.Application of wave equation analysis on laterally loaded group-pile[D].Taiwan:Tamkang University,2000.)
[15]VASANT A M,JANGID R S.Seismic response of base-isolated structures during impact with adjacement structures[J].Engineering Structures,2003,25:1311–1323.
[16]DANIEL O,DORA F,LUIS B.Comparative of the inlastic response of base isolated buildings[J].Earthquake Engineering and Structural Dynamics,2003,32:151–164.
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