中央扣对三塔悬索桥地震反应的影响
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摘要
针对三塔悬索泰州长江大桥这一特殊桥型,基于Abaqus台建立了该桥的空间动力有限元模型并进行非线性动力分析.研究了地震作用下,缆梁间刚性中央扣对三塔悬索桥塔梁位移、塔柱内力以及塔梁间弹性拉索的影响.研究结果表明:中央扣对三塔悬索桥动力特性有不可忽视的影响;由于中央扣增强了缆梁间相互作用,在地震作用下,中塔横向位移与加劲梁跨中竖向位移均有所增加,中塔柱纵桥向剪力有所减小;中央扣限制了加劲梁纵向位移并减小了加劲梁对中塔下横梁的作用,但边塔柱底扭矩有所增加.
As a special type of suspension bridge,Taizhou Bridge is a triple-tower suspension bridge.A spatial dynamic finite element model for it is established with finite element software Abaqus and the nonlinear dynamic analysis is performed.The influence of rigid central buckle between main cables and stiffening girder on seismic response of this bridge is investigated in detail,including displacements of towers and girder,forces in tower columns and elastic cables between lower beam and girder at mid-tower.The central buckle has unneglectable influence on the dynamic behavior of the bridge.The results show that the central buckle enhances the interaction between main cables and stiffening girder.When the bridge is subjected to seismic loads,the central buckle may cause the increment of transverse displacement of mid-tower in the direction across bridge and the vertical displacement at mid-span.Moreover it decreases the shear force at the bottom of mid-tower in the longitudinal direction,and thus well limits the longitudinal displacement of stiffening girder,and reduces the interaction between stiffening girder and lower beam of mid-tower.However,the twisting moment at the end columns of side tower increases significantly.
As a special type of suspension bridge,Taizhou Bridge is a triple-tower suspension bridge.A spatial dynamic finite element model for it is established with finite element software Abaqus and the nonlinear dynamic analysis is performed.The influence of rigid central buckle between main cables and stiffening girder on seismic response of this bridge is investigated in detail,including displacements of towers and girder,forces in tower columns and elastic cables between lower beam and girder at mid-tower.The central buckle has unneglectable influence on the dynamic behavior of the bridge.The results show that the central buckle enhances the interaction between main cables and stiffening girder.When the bridge is subjected to seismic loads,the central buckle may cause the increment of transverse displacement of mid-tower in the direction across bridge and the vertical displacement at mid-span.Moreover it decreases the shear force at the bottom of mid-tower in the longitudinal direction,and thus well limits the longitudinal displacement of stiffening girder,and reduces the interaction between stiffening girder and lower beam of mid-tower.However,the twisting moment at the end columns of side tower increases significantly.
引文
[1]雷俊卿,郑明珠,徐恭义.悬索桥设计[M].北京:人民交通出版社,2002.
[2]Xu Y L,Ko J M.Vibration studies of Tsing Ma Sus-pension Bridge[J].Journal of Bridge Engineering,1997,2(4):149-156.
[3]王浩,李爱群,杨玉冬,等.中央扣对大跨悬索桥动力特性的影响[J].中国公路学报,2006,19(6):49-52.Wang Hao,Li Aiqun,Yang Yudong,et al.Influenceof central buckle on dynamic behavior of long-span sus-pension bridge[J].China Journal of Highway andTransport,2006,19(6):49-52.(in Chinese)
[4]胡建华.大跨度自锚式悬索桥结构体系及静动力性能研究[D].长沙:湖南大学土木工程学院,2006.
[5]Kim Ho-Kyung,Lee Myeong-Jae,Chang Sung-Pil.Non-linear shape-finding analysis of a self-anchored sus-pension bridge[J].Engineering Structures,2002,24(12):1547-1559.
[6]徐勋,任伟平,强士中.影响大跨悬索桥地震响应的敏感因素[J].华南理工大学学报:自然科学版,2007,36(11):108-113.Xu Xun,Ren Weiping,Qiang Shizhong.Sensitive fac-tors to influence seismic response of long-span suspen-sion bridge[J].Journal of South China University ofTechnology:Natural Science Edition,2007,36(11):108-113.(in Chinese)
[7]Forsberg T.Multi-span suspension bridges[J].Interna-tional Journal of Steel Structures,2001,1(1):63-73.
[8]Yoshida O,Okuda M,Moriya T.Structural characteris-tics and applicability of four-span suspension bridge[J].Journal of Bridge Engineering,2004,9(5):453-463.
[9]阮静,吉林,祝金鹏.三塔悬索桥中塔结构选型分析[J].山东大学学报:工学版,2008,38(2):106-111.Ruan Jing,Ji Lin,Zhu Jingpeng.Structure style selec-tion of the mid-tower of a three-tower suspension bridge[J].Journal of Shang Dong University:EngineeringScience,2008,38(2):106-111.(in Chinese)
[10]吉林,陈策,冯兆祥.三塔悬索桥中塔主缆与鞍座间抗滑移试验研究[J].公路,2007(6):1-6.Ji Lin,Chen Ce,Feng Zhaoxiang.A study on slip re-sistance between main cable and saddle on middle tow-er of three-tower suspension bridge[J].Highway,2007(6):1-6.(in Chinese)
[11]邓育林,彭天波,李建中,等.大跨度三塔悬索桥动力特性及抗震性能研究[J].振动与冲击,2008,27(9):105-110.Deng Yulin,Peng Tianbo,Li Jianzhong,et al.Studyon dynamic characteristic and a seismic performance ofa long-span triple-tower suspension bridge[J].Journalof Vibration and Shock,2008,27(9):105-110.(inChinese)
[12]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[13]Bathe K J.Finite element procedures[M].NewJersey:Prentice-Hall,1996.
[2]Xu Y L,Ko J M.Vibration studies of Tsing Ma Sus-pension Bridge[J].Journal of Bridge Engineering,1997,2(4):149-156.
[3]王浩,李爱群,杨玉冬,等.中央扣对大跨悬索桥动力特性的影响[J].中国公路学报,2006,19(6):49-52.Wang Hao,Li Aiqun,Yang Yudong,et al.Influenceof central buckle on dynamic behavior of long-span sus-pension bridge[J].China Journal of Highway andTransport,2006,19(6):49-52.(in Chinese)
[4]胡建华.大跨度自锚式悬索桥结构体系及静动力性能研究[D].长沙:湖南大学土木工程学院,2006.
[5]Kim Ho-Kyung,Lee Myeong-Jae,Chang Sung-Pil.Non-linear shape-finding analysis of a self-anchored sus-pension bridge[J].Engineering Structures,2002,24(12):1547-1559.
[6]徐勋,任伟平,强士中.影响大跨悬索桥地震响应的敏感因素[J].华南理工大学学报:自然科学版,2007,36(11):108-113.Xu Xun,Ren Weiping,Qiang Shizhong.Sensitive fac-tors to influence seismic response of long-span suspen-sion bridge[J].Journal of South China University ofTechnology:Natural Science Edition,2007,36(11):108-113.(in Chinese)
[7]Forsberg T.Multi-span suspension bridges[J].Interna-tional Journal of Steel Structures,2001,1(1):63-73.
[8]Yoshida O,Okuda M,Moriya T.Structural characteris-tics and applicability of four-span suspension bridge[J].Journal of Bridge Engineering,2004,9(5):453-463.
[9]阮静,吉林,祝金鹏.三塔悬索桥中塔结构选型分析[J].山东大学学报:工学版,2008,38(2):106-111.Ruan Jing,Ji Lin,Zhu Jingpeng.Structure style selec-tion of the mid-tower of a three-tower suspension bridge[J].Journal of Shang Dong University:EngineeringScience,2008,38(2):106-111.(in Chinese)
[10]吉林,陈策,冯兆祥.三塔悬索桥中塔主缆与鞍座间抗滑移试验研究[J].公路,2007(6):1-6.Ji Lin,Chen Ce,Feng Zhaoxiang.A study on slip re-sistance between main cable and saddle on middle tow-er of three-tower suspension bridge[J].Highway,2007(6):1-6.(in Chinese)
[11]邓育林,彭天波,李建中,等.大跨度三塔悬索桥动力特性及抗震性能研究[J].振动与冲击,2008,27(9):105-110.Deng Yulin,Peng Tianbo,Li Jianzhong,et al.Studyon dynamic characteristic and a seismic performance ofa long-span triple-tower suspension bridge[J].Journalof Vibration and Shock,2008,27(9):105-110.(inChinese)
[12]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[13]Bathe K J.Finite element procedures[M].NewJersey:Prentice-Hall,1996.
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