塔梁间纵向弹性约束对铁路斜拉桥动力特性及地震反应的影响
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摘要
以某铁路斜拉桥为工程背景,研究了塔、梁间纵向弹性约束刚度取值对斜拉桥动力特性及主塔地震反应的影响。研究结果表明:纵向弹性约束对斜拉桥体系纵漂及主梁反对称竖弯振型影响较大。与漂浮体系相比,在弹性约束刚度的合理取值条件下,弹性约束使塔顶位移及塔身控制截面的弯矩有较大幅度的降低,但使部分塔身控制截面的剪力增大。
Taking a railway cable-stayed bridge as project background,the influnce of longitudinal elastic constraint installed between main tower and main girder on structural dynamic charateristic and seismic response of main tower was studied.The results show that the influnce of longitudinal elastic constraint on mode shapes of structural longitudinal floating and anti-symmetric vertical bending of main girder is significant.Compared with entirely floating system,elastic constraint results of displacement in the substantial decreases at tower top and bending moment at the critical sections of main tower,but shear force increases at the partial critical sections in condition of reasonable value for the stiffness of elastic constraint.
Taking a railway cable-stayed bridge as project background,the influnce of longitudinal elastic constraint installed between main tower and main girder on structural dynamic charateristic and seismic response of main tower was studied.The results show that the influnce of longitudinal elastic constraint on mode shapes of structural longitudinal floating and anti-symmetric vertical bending of main girder is significant.Compared with entirely floating system,elastic constraint results of displacement in the substantial decreases at tower top and bending moment at the critical sections of main tower,but shear force increases at the partial critical sections in condition of reasonable value for the stiffness of elastic constraint.
引文
[1]Eurocode 8,Design of Structures for Earthquake Resist-ance Part 2-Bridges,No:pr EN 1998-2:200X[C]//CEN:European Committee for Standardization.2004.
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[8]高永,刘慈军,彭天波,等.阻尼器和弹性索组合使用对大跨斜拉桥地震反应的影响[J].结构工程师,2008,24(5):71-76.GA0 Yong,LIU Ci-jun,PENG Tian-bo,et al.Seismicperformance analysis of long-span cable-stayed bridgesusing both dampers and elastic cable[J].Structural En-gineers,2008,24(5):71-76.
[9]黄小国,李建中,郭磊.地震作用下独塔斜拉桥合理约束体系[J].结构工程师,2008,24(6):30-35.HUANG Xiao-guo,LI Jian-zhong,GUO Lei.Appropriateconstraint systems for simple-tower cable-stayed bridg-es under earthquake[J].Structural Engineers,2008,24(6):30-35.
[10]颜海泉,王君杰.飘浮体系斜拉桥纵向抗震计算的单塔模型[J].地震工程与工程振动,2007,27(4):80-86.YAN Hai-quan,WANG Jun-jie.A tower model for seis-mic response prediction or floating cable-stayed bridgein longitudinal direction[J].Journal of Earthquake En-gineering and Engineering Vibration,2007,27(4):80-86.
[2]闫冬,袁万城.大跨度斜拉桥的抗震概念设计[J].同济大学学报:自然科学版,2004,32(10):1344-1348.YAN Dong,YUAN Wan-cheng.Conceptual seismic de-sign for long-span cable-stayed bridges[J].Journal ofTongji University:Natural Science Edition,2004,32(10):1344-1348.
[3]叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究[J].桥梁建设,2002(2):1-4.YE Ai-jun,HU Shi-de,FAN Li-chu.Research on aseis-matic structural system of cable-stayed bridge[J].Bridge Construction,2002(2):1-4.
[4]徐利平.超大跨径斜拉桥的结构体系分析[J].同济大学学报:自然科学版,2003,31(4):400-403.XU Li-ping.Structural system analysis for super-longspan cabIe-statyed bridges[J].Journal of Tongji Uni-versity:Natural Science Edition,2003,31(4):400-403.
[5]郝超,强士中,刘民.白沙洲长江大桥不同主梁纵向约束方式及其对结构抗震性能的影响[J].中国公路学报,1999,12(4):22-28.HAO Chao,QIANG Shi-zhong,LIUMin.Analysis of dif-ferent longitudinal restraint conditions in main girder andtheir effects on the seism ic behavior of Wuhan WhiteShoal Yangtz River Bridge[J].China Journal of Highwayand Transport,1999,12(4):22-28.
[6]宋鑫,邱文亮.吉林兰旗松花江大桥抗震分析与研究[J].公路交通科技,2006,23(3):93-97.SONG Xin,QIUWen-liang.Aseismatic research on LanQiSongHua River bridge[J].Journal of Highway andTransportation Research and Developmen.2006,23(3):93-97.
[7]蒋伟,李洞明,李杨.塔梁间纵向弹性约束对斜拉桥抗震性能的影响[J].现代交通技术,2007,4(5):50-52.JIANG Wei,LI Dong-ming,LI Yang.The influence of lon-gitudinal elastic constraints between the tower and beamon the seismic performance of cable-stayed bridges[J].Modern Transportation Technology,2007,4(5):50-52.
[8]高永,刘慈军,彭天波,等.阻尼器和弹性索组合使用对大跨斜拉桥地震反应的影响[J].结构工程师,2008,24(5):71-76.GA0 Yong,LIU Ci-jun,PENG Tian-bo,et al.Seismicperformance analysis of long-span cable-stayed bridgesusing both dampers and elastic cable[J].Structural En-gineers,2008,24(5):71-76.
[9]黄小国,李建中,郭磊.地震作用下独塔斜拉桥合理约束体系[J].结构工程师,2008,24(6):30-35.HUANG Xiao-guo,LI Jian-zhong,GUO Lei.Appropriateconstraint systems for simple-tower cable-stayed bridg-es under earthquake[J].Structural Engineers,2008,24(6):30-35.
[10]颜海泉,王君杰.飘浮体系斜拉桥纵向抗震计算的单塔模型[J].地震工程与工程振动,2007,27(4):80-86.YAN Hai-quan,WANG Jun-jie.A tower model for seis-mic response prediction or floating cable-stayed bridgein longitudinal direction[J].Journal of Earthquake En-gineering and Engineering Vibration,2007,27(4):80-86.
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