双薄壁高墩曲线连续刚构桥地震响应分析
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摘要
为确定双薄壁高墩曲线连续刚构桥的自振特性和最不利地震激励方向,以某大跨径双薄壁高墩曲线连续刚构桥为实例,对其进行了自振特性和地震响应分析。应用MIDAS/Civil有限元软件建立了该桥空间有限元计算模型,采用数值仿真方法研究了墩底边界约束、曲率半径对该高墩曲线连续刚构桥结构自振特性的影响,探讨双薄壁高墩曲线连续刚构桥动力特性,并按照最不利地震激励方向分析双薄壁高墩曲线连续刚构桥的地震响应。计算结果表明:对于高等级公路中的曲线半径较大的双薄壁高墩曲线连续刚构桥,曲率对桥梁的自振特性影响很小;曲线连续刚构桥第1阶振动模态一般为纵飘,考虑桩土结效应后其基本周期增大;以曲线桥割线方向和垂直割线方向作为双薄壁高墩曲线连续刚构桥的纵向、横向地震动的主要激励方向,其它地震动输入方向可作为曲线连续刚构桥地震响应分析的补充。
To understand free vibration feature and most unfavorable seismic excitation direction of continuous rigid frame curved bridge with double thin-walled high pier,taking a long-span continuous rigid frame curved bridge with double thin-walled high pier as an example,the free vibration feature and seismic response were analyzed.Using FEA software MIDAS,bridge structural spatial finite element model was introduced.Through analyzing the influence of pier bottom boundary constraint,radius of curvature on bridge's natural vibration characteristics,the dynamic features of the bridge were explored.At last,based on the most unfavorable seismic excitation direction,seismic response of continuous rigid frame curved bridge with double thin-walled high pier was analyzed.It indicates that the effect of curvature radius is not great for continuous rigid frame curved bridge with a large radius of curvature and double thin-walled high pier in the highway.Its first order vibration mode is longitudinal drift in general.And fundamental period is increased because of the effect of pile soil structure.The seismic excitation direction may adopt secant direction and vertical secant direction as the main longitudinal and transverse excitation direction.The other directions may be taken as supplement of seismic response analytsis.
To understand free vibration feature and most unfavorable seismic excitation direction of continuous rigid frame curved bridge with double thin-walled high pier,taking a long-span continuous rigid frame curved bridge with double thin-walled high pier as an example,the free vibration feature and seismic response were analyzed.Using FEA software MIDAS,bridge structural spatial finite element model was introduced.Through analyzing the influence of pier bottom boundary constraint,radius of curvature on bridge's natural vibration characteristics,the dynamic features of the bridge were explored.At last,based on the most unfavorable seismic excitation direction,seismic response of continuous rigid frame curved bridge with double thin-walled high pier was analyzed.It indicates that the effect of curvature radius is not great for continuous rigid frame curved bridge with a large radius of curvature and double thin-walled high pier in the highway.Its first order vibration mode is longitudinal drift in general.And fundamental period is increased because of the effect of pile soil structure.The seismic excitation direction may adopt secant direction and vertical secant direction as the main longitudinal and transverse excitation direction.The other directions may be taken as supplement of seismic response analytsis.
引文
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[6]胡明刚.曲线梁桥的动力分析及抗震性能研究[D].成都:西南交通大学,2010.HU Minggang.Dynamic and Seismic Behavior Researches on Curved Girder Bridges[D].Chengdu:Southwest Jiaotong University thesis,2010.
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[12]石雄伟,刘海鹏,周勇军,等.双薄壁墩间距对连续刚构桥地震响应的影响[J].交通运输工程学报,2010,10(3):35-40.SHI Xiong-wei,LIU Hai-peng,ZHOU Yong-jun,etc..Effect of double-thin-wall distance on seismic response of continuous rigid framebridge[J].Journal of Traffic and Transportation Engineering,2010,10(3):35-40.
[13]何波,郭小川,朱宏平,李俊.大跨薄壁墩连续刚构桥动力特性研究[J].世界桥梁,2006,(4):40-43.HE Bo,GUO Xiao-chuan,ZHU Hong-ping,LI Jun.Study of Dynamic Characteristics of Long Span Continuous Rigid-Frame Bridge withThin-Wall Piers[J].World Bridges,2006,(4):40-43.
[14]吴六政.曲线梁桥设计中几个关键技术研究[D].成都:西南交通大学,2004.WU Liuzhen.Study on the Key Teehnologies of the Curved Girder Bridges Design[D].Chengdu:Southwest Jiaotong University thesis,2004.
[15]李国豪.桥梁结构稳定与振动(修订版)[M].北京:中国铁道出版社,2002.LI Guohao.Stability and Vibration of Bridge Structures(Revised Edition)[M].Beijing:China Railway Publishing House,2002.
[2]宗周红,赖苍林,林有勤,任伟新.大跨度预应力混凝土连续刚构桥的动力特性分析研究[J].地震工程与工程振动,2004,24(3):98-104.ZONG Zhouhong,LAI Canglin,LIN Youqin,REN Weixin.Analysis of dynamic characteristics of a large-span prestressed concrete continuousrigid frame bridge[J].Earthquake Engineering and Engineering Vibration,2004,24(3):98-104.
[3]周永军.高墩大跨曲线连续刚构桥梁地震响应的设计参数研究[D].西安:长安大学,2006.ZHOU Yongjun.Study on design parameters affecting the seismic response of curved continuous rigid frame bridges with long-span and high-pier[D].Xi’an:Chang’an University thesis,2006.
[4]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):44-50.ZHU Dong-sheng,LIU Shi-zhong,YU Lu-song.Research on seismic response of curved girder bridges[J].China Journal of Highway andTransport,2002,15(3):44-50.
[5]刘学建.非规则高架桥抗震模型及参数影响研究[D].西安:西安建筑科技大学,2007.LIU Xuejian.Research on Earthquake-resistance Model and Parameter Influence of Irregular Viaduct[D].Xi’an:Xi’an University of Architec-ture and Technology thesis,2007.
[6]胡明刚.曲线梁桥的动力分析及抗震性能研究[D].成都:西南交通大学,2010.HU Minggang.Dynamic and Seismic Behavior Researches on Curved Girder Bridges[D].Chengdu:Southwest Jiaotong University thesis,2010.
[7]杨艳军.曲线连续刚构桥力学性能研究[D].西安:长安大学,2010.YANGYanju.Study on the Mechanical Properties of the Curved Rigid Frame Bridge[D].Xi’an:Chang’an University thesis,2010.
[8]吴卫祥.预应力混凝土曲线梁桥的受力分析[D].长沙:湖南大学2005.WU Weixiang.The Mechanical Analysis on Curved Grider Bridge of Prestressed Concrete[D].Changsha:Hunan University thesis,2005.
[9]王磊.高墩大跨连续刚构直弯对比研究[D].北京:北京工业大学,2004.WANG Lei.Comparison and Analytic Research on Long Span Continuous Rigid Frame Bridges with High Pier Between the Straight and the CurvedBridges[D].Beijing:Beijing University of Technology thesis,2004.
[10]单德山,李乔.铁路曲线梁桥抗震设计分析[J].重庆交通学院学报,2005,24(1):1-4.SHAN Deshan,LI Qiao.Study of aseismic design for railway curve-girder bridge[J].Journal of Chongqing Jiaotong University,2005,24(1):1-4.
[11]徐君兰,顾安邦.连续刚构桥主墩刚度合理性的探讨[J].公路交通科技,2005,22(2):59-62.XU Junlan,GU Anbang.Discussion of Rationality of Rigidity of Continuous Rigid Frame Bridge[J].Journal of Highway and Transportation Re-search and Development,2005(2),Vol.22 No.2,59-62.
[12]石雄伟,刘海鹏,周勇军,等.双薄壁墩间距对连续刚构桥地震响应的影响[J].交通运输工程学报,2010,10(3):35-40.SHI Xiong-wei,LIU Hai-peng,ZHOU Yong-jun,etc..Effect of double-thin-wall distance on seismic response of continuous rigid framebridge[J].Journal of Traffic and Transportation Engineering,2010,10(3):35-40.
[13]何波,郭小川,朱宏平,李俊.大跨薄壁墩连续刚构桥动力特性研究[J].世界桥梁,2006,(4):40-43.HE Bo,GUO Xiao-chuan,ZHU Hong-ping,LI Jun.Study of Dynamic Characteristics of Long Span Continuous Rigid-Frame Bridge withThin-Wall Piers[J].World Bridges,2006,(4):40-43.
[14]吴六政.曲线梁桥设计中几个关键技术研究[D].成都:西南交通大学,2004.WU Liuzhen.Study on the Key Teehnologies of the Curved Girder Bridges Design[D].Chengdu:Southwest Jiaotong University thesis,2004.
[15]李国豪.桥梁结构稳定与振动(修订版)[M].北京:中国铁道出版社,2002.LI Guohao.Stability and Vibration of Bridge Structures(Revised Edition)[M].Beijing:China Railway Publishing House,2002.
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