桩-土-结构相互作用对大跨度斜拉桥地震响应的影响
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摘要
土层条件对结构在地震作用下的破坏有很大影响。本文旨在对考虑桩-土-结构动力相互作用(PSSI)对大跨度斜拉桥地震响应造成的影响进行评估。文中将桩-土相互作用理想化为采用连续分布的水平弹簧和粘滞阻尼器的Penzien模型,并用ANSYS有限元分析软件对苏通大桥整体模型进行地震响应时程分析来研究PSSI的影响。可以看出,PSSI对苏通大桥地震响应有显著影响,如果忽略PSSI效应,大部分响应将被低估。
Soil conditions have a great deal to do with damage to structures during earthquakes.This paper attempts to assess the influence of dynamic pile-soil-structure interaction(PSSI) on the seismic behavior of long span cable stayed bridge.In the present approach,the soil-pile interaction was idealized as Penzien model using continuously distributed springs and viscous dampers placed in parallel.The effects of PSSI on integral model of SUTONG Bridge were investigated by performing seismic analysis in time domain using ANSYS FEM software.It is observed that the PSSI has significant effects on the seismic response of SUTONG Bridge and a majority of responses may be underestimated if the PSSI effects are ignored.
Soil conditions have a great deal to do with damage to structures during earthquakes.This paper attempts to assess the influence of dynamic pile-soil-structure interaction(PSSI) on the seismic behavior of long span cable stayed bridge.In the present approach,the soil-pile interaction was idealized as Penzien model using continuously distributed springs and viscous dampers placed in parallel.The effects of PSSI on integral model of SUTONG Bridge were investigated by performing seismic analysis in time domain using ANSYS FEM software.It is observed that the PSSI has significant effects on the seismic response of SUTONG Bridge and a majority of responses may be underestimated if the PSSI effects are ignored.
引文
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[8]Idriss I M,Sun J I.Users manual for SHAKE91[M].University of California.1992.
[2]伍小平.砂土-桩-结构相互作用振动台试验研究[D].同济大学博士学位论文,2002.
[3]Penzien J,Scheffy C,Parmelee R.Seismic analysis of bridge on long piles[J].Engineering Mechanics Division,ASCE,1964,90(3):223-254.
[4]Anagnostopoulos S A.Pile foundation modeling for in elastic earthquake analyses of large structures[J].Engineering Structures,1983(2):15-22.
[5]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社.1997:80-115.
[6]Newmark N M,Rosenblueth E.Fundamentals of Earthquake Engineering[M].Prentice-Hall Ine Englewood Cliffs.N.J.1971.
[7]陈国兴,谢君斐,张克绪.桩和群桩的静刚度及动力阻抗(下)[J].世界地震工程.1995,4:35-43.
[8]Idriss I M,Sun J I.Users manual for SHAKE91[M].University of California.1992.
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