考虑土-结构相互作用的大跨度斜拉桥长周期地震反应分析
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摘要
为分析处于软土地基上的大跨度斜拉桥在长周期地震动下的反应,通过ANSYS有限元软件和SHAKE土层地震反应分析程序等辅助软件,基于Penzien模型建立了某大跨度斜拉桥的整体有限元模型。选取一条长周期地震波和一条普通地震波比较分析了自由场地的地震反应,并在此基础上对考虑土-结构相互作用的斜拉桥地震响应进行了研究。结果表明,长周期地震动对软弱土层产生的不利影响要远远大于普通地震动,部分土层产生液化并丧失承载能力,同时,软土地基上的大跨度斜拉桥对长周期地震动十分敏感,结构的地震响应要明显大于普通地震动作用下的响应。
In order to analyze the long-period seismic response of long-span cable-stayed bridge on soft foundation,an integral finite element model of a long-span cable-stayed bridge based on Penzien model was built by using some assistant softwares just like ANSYS software and SHAKE soil stratum seismic response analysis program.The seismic response of free field was comparatively analyzed by choosing a long-period seismic wave and a normal seismic wave.Based on this,the seismic response of cable-stayed bridge in consideration of soil-structure interaction was investigated.It is observed that(1) the adverse effect of long-period seismic ground motion on soft foundation is far more greater than that of normal seismic ground motion,and certain soil layer was liquefied and lost bearing capacity;(2) the long-span cable-stayed bridge on soft foundation is quite sensitive to long-period seismic ground motion,and the seismic response of the structure to this seismic ground motion is much greater than that to normal seismic ground motion.
In order to analyze the long-period seismic response of long-span cable-stayed bridge on soft foundation,an integral finite element model of a long-span cable-stayed bridge based on Penzien model was built by using some assistant softwares just like ANSYS software and SHAKE soil stratum seismic response analysis program.The seismic response of free field was comparatively analyzed by choosing a long-period seismic wave and a normal seismic wave.Based on this,the seismic response of cable-stayed bridge in consideration of soil-structure interaction was investigated.It is observed that(1) the adverse effect of long-period seismic ground motion on soft foundation is far more greater than that of normal seismic ground motion,and certain soil layer was liquefied and lost bearing capacity;(2) the long-span cable-stayed bridge on soft foundation is quite sensitive to long-period seismic ground motion,and the seismic response of the structure to this seismic ground motion is much greater than that to normal seismic ground motion.
引文
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[14]臧明明,陈清军.长周期地震动的场地效应与大跨桥梁结构的动力响应分析[J].结构工程师,2010,26(1):118-125.ZANG Mingming,CHEN Qingjun.Site Effect of Long-period Ground Motion and Dynamic Analysis of Long-span Bridge Structures[J].Structural Engineers,2010,26(1):118-125.
[2]杨伟林,朱升初,洪海春,等.汶川地震远场地震动特征及其对长周期结构影响的分析[J].防灾减灾工程学报,2009,29(4):473-478.YANG Weilin,ZHU Shengchu,HONG Haichun,et al.Characteristics of Far-field Ground Motion of Wenchuan Earthquake and the Effect on Long-periodic Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2009,29(4):473-478.
[3]SUGAWARA Y,UETAKE T,KOBAYASHI T,et al.Forced Vibration Test of the Hualien Large Scale Soil Structure Interaction Model:Part2[J].Nuclear Engineering and Design,1997,172:273-280.
[4]伍小平.砂土-桩-结构相互作用振动台试验研究[D].上海:同济大学,2002.WU Xiaoping.Shaking Table Model Tests of Soil-pile-superstructure Interaction in Dry Sand[D].Shanghai:Tongji University,2002.
[5]段浪,金波.桩-土-结构相互作用对大跨度斜拉桥地震响应的影响[J].力学季刊,2011,32(1):81-90.DUAN Lang,JIN Bo.Influence of Pile-soil-structure Interaction on Seismic Response of Long-span Cable-stayed Bridge[J].Chinese Quarterly of Mechanics,2011,32(1):81-90.
[6]贡金鑫,张勤,王雪婷.从汶川地震中桥梁震害看现行国内外桥梁抗震设计方法(一)———抗震设防标准和抗震计算[J].公路交通科技,2010,27(9):44-54.GONG Jinxin,ZHANG Qin,WANG Xueting.Comparative Study on Bridge Seismic Design Approaches in Different Specifications Based on Survey of Disaster in Wenchuan Earthquake(Part1):Seismic Fortification Criterion and Earthquake Response Calculation[J].Journal of Highway and Transportation Research and Development,2010,27(9):44-54.
[7]李春凤.汶川地震桥梁震害与延性抗震设计探讨[J].公路交通科技,2009,26(4):98-102.LI Chunfeng.Discussion on Bridge Damage in Wenchuan Earthquake and Seismic Ductility Design[J].Journal of Highway and Transportation Research and Development,2009,26(4):98-102.
[8]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.SUN Limin,ZHANG Chennan,PAN Long,et al.Lumped-mass Model and Its Parameters for Dynamic Analysis of Bridge Pier-pile-soil System[J].Journal of Tongji University,2002,30(4):409-415.
[9]ANAGNOSTOPOULOS S A.Pile foundation Modeling for Inelastic Earthquake Analyses of Large Structures[J].Engineering Structures,1983(2):15-22.
[10]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.WANG Songtao,CAO Zi.Modern Aseismatic Design Methods[M].Beijing:China Architecture and Building Press,1997.
[11]NEWMARK N M,ROSENBLUETH E.Fundamentals of Earthquake Engineering[M].Englewood Cliffs,NJ:Prentice-Hall Inc.,1971.
[12]IDRISS I M,SUN J I.User's Manual for SHAKE91:A Computer Program for Conducting Equivalent Linear Seismic Response Analyses of Horizontally Layered Soil Deposits[M]Davis,CA:University of California,1993.
[13]杨佑发,白文轩,魏建东.采用Ernst公式计算斜拉桥拉索振动特性的精度分析[J].世界地震工程,2008,24(2):50-53.YANG Youfa,BAI Wenxuan,WEI Jiandong.Precision Analysis of Dynamic Characteristics of Cable Using Ernst's Modified Formula in Cable-stayed Bridge[J].World Earthquake Engineering,2008,24(2):50-53.
[14]臧明明,陈清军.长周期地震动的场地效应与大跨桥梁结构的动力响应分析[J].结构工程师,2010,26(1):118-125.ZANG Mingming,CHEN Qingjun.Site Effect of Long-period Ground Motion and Dynamic Analysis of Long-span Bridge Structures[J].Structural Engineers,2010,26(1):118-125.
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