大跨多塔斜拉桥动力特性及抗震性能研究
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摘要
结合一座大跨多塔斜拉桥工程设计实例,分析了桥塔与主梁之间不同约束形式的大跨多塔斜拉桥体系动力特性,对比研究了不同塔、梁间纵向约束方式对结构关键位置地震反应的影响。分析表明,桥塔与主梁间纵向约束方式的设置对结构的动力特性影响很大;在水平和竖向地震作用下,不同桥塔主梁约束形式的结构体系,各桥塔关键位置的内力差异也较大;释放各桥塔、主梁之间的纵向约束,可以减小塔底、承台底的弯矩以及塔底剪力,但会增大由于承台振动对承台底剪力的贡献。
Based on an engineering design case of a multi-tower cable stayed bridge, the dynamic characteristic of the bridge was discussed. The influence of different longitudinal constraint manners settled between tower and beam on seismic responses of the bridge was also discussed. The results indicate that different longitudinal constraint manners between tower and beam have great influence on dynamic characteristics and seismic responses of the bridge. The distribution of internal forces between bottoms of towers is different. By releasing the longitudinal constraint between tower and beam, seismic responses of bending moment and shearing force in the bottom of tower and pile caps can be reduced. On the contrary, the shearing force contributed by the vibration of pile caps will be increased.
Based on an engineering design case of a multi-tower cable stayed bridge, the dynamic characteristic of the bridge was discussed. The influence of different longitudinal constraint manners settled between tower and beam on seismic responses of the bridge was also discussed. The results indicate that different longitudinal constraint manners between tower and beam have great influence on dynamic characteristics and seismic responses of the bridge. The distribution of internal forces between bottoms of towers is different. By releasing the longitudinal constraint between tower and beam, seismic responses of bending moment and shearing force in the bottom of tower and pile caps can be reduced. On the contrary, the shearing force contributed by the vibration of pile caps will be increased.
引文
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[5] 朱宇,康仕彬,邓育林.自锚式悬索桥动力特性及地震反应特点[J].结构工程师,2008,24(4) :64-70．
[6] 鲁传安,胡世德,叶爱君.强震区大跨高墩连续梁桥抗震性能研究[J].结构工程师,2007,23(6) :56-61．
[7] 闫冬,袁万成.大跨度斜拉桥的抗震概念设计[J].同济大学学报,2004,32(10) :1344-1348．
[8] 黄融,王志强.东海大桥抗震性能分析研究[J].世界桥梁,2004(增刊):42-44．
[2] 叶爱君.大跨度桥梁抗震设计[D].上海:同济大学,1998．
[3] 叶爱君,胡世德,范立础.大跨度桥梁抗震设计实用方法[J].土木工程学报,2001,34(1) :1-6．
[4] 杨玉民,袁万城,范立础大跨斜拉桥横向地震反应及其分形特征[J].同济大学学报,2001,2(1) :15-19．
[5] 朱宇,康仕彬,邓育林.自锚式悬索桥动力特性及地震反应特点[J].结构工程师,2008,24(4) :64-70．
[6] 鲁传安,胡世德,叶爱君.强震区大跨高墩连续梁桥抗震性能研究[J].结构工程师,2007,23(6) :56-61．
[7] 闫冬,袁万成.大跨度斜拉桥的抗震概念设计[J].同济大学学报,2004,32(10) :1344-1348．
[8] 黄融,王志强.东海大桥抗震性能分析研究[J].世界桥梁,2004(增刊):42-44．
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