动力p-y曲线模型在桥梁桩基础分析中的应用
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摘要
地震作用下土-桩-结构相互作用(SSPSI)是桥梁抗震领域的一个重点和难点问题。在介绍动力p-y曲线分析模型的基础上,通过与试验对比验证其合理性,通过参数敏感性分析确定其影响参数,并对其进行了进一步探讨。研究发现:动力p-y曲线分析模型可较为全面地描述SSPSI,砂土摩擦角是该模型的主要参数,自由场土体应尽可能取较大的长度,地震动强度影响土体进入非线性的程度。
Seismic soil-pile-structure interaction(SSPSI)is one of the most important and complex issue in the field of seismic resistance of bridges.Based on the introduction of dynamic p-y curve analysis model,whose rationality is verified with tests,sensitivity analysis on parameters and further discussion are done afterwards.It is found that SSPSI could be more comprehensive described by the dynamic p-y curve analysis model.Friction angle of sand is the main parameter of the model.Larger length of free field would be appropriate as far as possible.The degree of soil non-linearity is affected by the intensity of ground motion.
Seismic soil-pile-structure interaction(SSPSI)is one of the most important and complex issue in the field of seismic resistance of bridges.Based on the introduction of dynamic p-y curve analysis model,whose rationality is verified with tests,sensitivity analysis on parameters and further discussion are done afterwards.It is found that SSPSI could be more comprehensive described by the dynamic p-y curve analysis model.Friction angle of sand is the main parameter of the model.Larger length of free field would be appropriate as far as possible.The degree of soil non-linearity is affected by the intensity of ground motion.
引文
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[2]孔德森,栾茂田,杨庆.桩土相互作用分析中的动力Winkler模型研究评述[J].世界地震工程,2005,21(1):12-17.Kong Desen,Luan Maotian,Yang Qing.Review of dynamic Winkler model applied in pile-soil interaction analyses[J].World Earthquake Engi-neering,2005,21(1):12-17.
[3]El Naggar MH,Novak M.Nonlinear axial interaction in pile dynamics[J].Journal of the Geotechnical Engineering,ASCE,1994,120(4):678-696.
[4]Novak M.Dynamic stiffness and damping of piles[J].Canadian Geotechnical Journal,1976,11(5):674-698.
[5]Nogami T,Konagai K.Time domain flexural response of dynamically loaded single piles[J].Journal of Engineering Mechanics,ASCE,1988,114(9):1512-1525.
[6]El Naggar MH,Novak M.Nonlinear analysis for dynamic lateral pile response[J].Soil Dynamics and Earthquake Engineering,1996,15(4):233-244.
[7]El Naggar MH,Novak M.Nonlinear lateral interaction in pile dynamics[J].Soil Dynamics and Earthquake Engineering,1995,14(2):141-157.
[8]Nogami T,Otani J,Konagai K,et al.Nonlinear soil-pile interaction for dynamic lateral motion[J].Journal of the Geotechnical Engineering Di-vision,ASCE,1992,118(1):89-106.
[9]Ross W B,Christina J C,Bruce L K,et al.Seismic soil-pile-structure interaction experiments and analyses[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(9):750-759.
[10]Daniel N F.Behavior of lateral loaded drilled shaft groups[D].Arizona State University,2001.
[11]Christina J C,Ross WB,Bruce LK,et al.Dynamic experiments and analysis of a pile-group-supported structure[J].Journal of Geotechni-cal and Geoenvironmental Engineering,2001,127(7):585-596.
[12]Ross W B,Bruce LK,Brandenberg S J,et al.Pile foundations in liquefied and laterally spreading ground during earthquakes:centrifuge experi-ments&analyses[R].University of California at Davis,September,2003.Report No.UCD/CGM-03/01.
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