考虑SSI三种效应的桩基础RC梁式桥抗震性能评估方法研究
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摘要
桩-土-桥动力相互作用是桥梁抗震研究的热点和难点问题,需合理考虑地基土柔度效应、运动学效应及阻尼效应的影响。采用基于性能点轨迹法的结构非线性静力分析方法,引入FEMA440针对土-结相互作用运动学效应、地基阻尼效应的地震动需求谱修正算法,探讨建立综合考虑桩-土相互作用三种效应的桩基础RC桥梁的抗震性能评估方法。以某高速公路RC连续梁桥为算例,分别以三种设计谱及相应的人工波为输入进行非线性静、动力方法验算对比,两个水准下的计算结果表明所建议方法在补充考虑后两种效应后,地震响应略小于以考虑第一种效应为主的动力时程法,所建议方法能有效评估桩基础桥梁在预期地震需求下的抗震性能。
The dynamic interaction among pile-soil-bridge system is a hot spot and a difficult problem of aseismic design of bridges,and the flexible foundation effect,kinematics effect and foundation damping effect should be reasonably considered.Here,by introducing a seismic demand spectrum modification algorithm of kinematics interaction effect and foundation damping one with FEMA440,an aseismic performance evaluation method taking effectively three kinds of SSI effect for a pile-foundation RC girder bridge into account was developed based on structural nonlinear static analysis method.With a highway RC continuous girder bridge as an example,the nonlinear static and dynamic analysis were conducted respectively for the aim of comparison with three kinds of design spectra and the corresponding artificial waves as inputs.The results under two earthquake levels showed that the seismic response of the bridge taking the 2nd and the 3rd kinds of effect into account with the proposed method is slightly smaller than that of the bridge taking the 1st kind of effect into account with the dynamic time-history method,and the proposed method can be used to evaluate effectively the aseismic performance of a pile-foundation bridge under the anticipated earthquake demand.
The dynamic interaction among pile-soil-bridge system is a hot spot and a difficult problem of aseismic design of bridges,and the flexible foundation effect,kinematics effect and foundation damping effect should be reasonably considered.Here,by introducing a seismic demand spectrum modification algorithm of kinematics interaction effect and foundation damping one with FEMA440,an aseismic performance evaluation method taking effectively three kinds of SSI effect for a pile-foundation RC girder bridge into account was developed based on structural nonlinear static analysis method.With a highway RC continuous girder bridge as an example,the nonlinear static and dynamic analysis were conducted respectively for the aim of comparison with three kinds of design spectra and the corresponding artificial waves as inputs.The results under two earthquake levels showed that the seismic response of the bridge taking the 2nd and the 3rd kinds of effect into account with the proposed method is slightly smaller than that of the bridge taking the 1st kind of effect into account with the dynamic time-history method,and the proposed method can be used to evaluate effectively the aseismic performance of a pile-foundation bridge under the anticipated earthquake demand.
引文
[1]中华人民共和国交通运输部.《公路桥梁抗震设计细则》(JTG/T B02-01-2008)[S].北京:人民交通出版社,2008.
[2]GB50011-2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.
[3]FEMA440.Improvement of nonlinear static seismic analysis procedures[R].Federal Emergency Management Agency,Washington D.C,2005.
[4]Penzien J,Scheffey C F,Parmelee R A.Seismic analysis of bridges on long piles[J].Journal of Engineering Mechanics Division,1964,90(EM3):223-254.
[5]孙利民,张晨南,潘龙,等.桥梁桩土相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.
[6]陈荣金,侯光阳,李永乐.桩土相互作用对矮塔斜拉桥地震响应特性的影响分析[J].西南公路,2010,45-47.
[7]Limkatanyu S,Kuntiyawichai K,Spacone E.Response of reinforced concrete piles including soil-pile interaction effects[J].Engineering Structures,2009,31:1976-1986.
[8]孙剑平,朱晞.桩基础桥梁的土-结构动力相互作用[J].铁道学报,2001,23(2):65-69.
[9]周建春,魏琴,寿楠椿.群桩-地基土-桥梁结构的相互作用分析[J].华南理工大学学报(自然科学版),2002,30(5):70-74.
[10]中华人民共和国交通运输部.《公路桥涵地基与基础设计规范》(JTG D63-2007)[S].北京:人民交通出版社,2007.
[11]Applied Technology Council(ATC).Seismic evaluation and retrofit of concrete building report ATC-40[R].Redwood City,USA:Applied Technology Council,1996.
[12]李杰.考虑SSI效应的近断层区桥梁抗震性能研究[D].北京:北京交通大学,2011.
[13]山东省地震工程研究院.山东省国家重点公路天津至汕尾青州―鲁苏界高速公路(合同段)地震安全性评价工作报告(鲁)甲009-2004-11[R].2004.
[14]慎丹.近场地震作用下RC梁式桥抗震设计几个关键问题的研究[D].北京:北京交通大学,2011.
[2]GB50011-2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.
[3]FEMA440.Improvement of nonlinear static seismic analysis procedures[R].Federal Emergency Management Agency,Washington D.C,2005.
[4]Penzien J,Scheffey C F,Parmelee R A.Seismic analysis of bridges on long piles[J].Journal of Engineering Mechanics Division,1964,90(EM3):223-254.
[5]孙利民,张晨南,潘龙,等.桥梁桩土相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.
[6]陈荣金,侯光阳,李永乐.桩土相互作用对矮塔斜拉桥地震响应特性的影响分析[J].西南公路,2010,45-47.
[7]Limkatanyu S,Kuntiyawichai K,Spacone E.Response of reinforced concrete piles including soil-pile interaction effects[J].Engineering Structures,2009,31:1976-1986.
[8]孙剑平,朱晞.桩基础桥梁的土-结构动力相互作用[J].铁道学报,2001,23(2):65-69.
[9]周建春,魏琴,寿楠椿.群桩-地基土-桥梁结构的相互作用分析[J].华南理工大学学报(自然科学版),2002,30(5):70-74.
[10]中华人民共和国交通运输部.《公路桥涵地基与基础设计规范》(JTG D63-2007)[S].北京:人民交通出版社,2007.
[11]Applied Technology Council(ATC).Seismic evaluation and retrofit of concrete building report ATC-40[R].Redwood City,USA:Applied Technology Council,1996.
[12]李杰.考虑SSI效应的近断层区桥梁抗震性能研究[D].北京:北京交通大学,2011.
[13]山东省地震工程研究院.山东省国家重点公路天津至汕尾青州―鲁苏界高速公路(合同段)地震安全性评价工作报告(鲁)甲009-2004-11[R].2004.
[14]慎丹.近场地震作用下RC梁式桥抗震设计几个关键问题的研究[D].北京:北京交通大学,2011.
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