漭街渡深水桥梁抗震分析
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摘要
漭街渡大桥为目前国内在建和已建深水桥梁中水深最大的桥梁。由于地处地震多发区,必须研究其在地震作用下结构在水中的地震反应及水体对结构地震响应的影响程度。根据深水桥梁特点,基于线性辐射波浪理论和特征函数扩展法分别得到考虑弹性结构流固耦合时空心墩内部和外部水体作用于桥墩有限元节点上动水力的近似解析表达后,采用混合分析方法建立了深水桥梁地震分析的有限元模型。计算分析结果表明,水体对漭街渡深水桥梁动力特性及地震反应的影响较为显著不能忽略。
A semi-analytical and semi-numerical approach for earthquake induced hydrodynamic force on elastic rectangular hollow bridge pier was developed to study the seismic response of Mangjiedu deep-water bridge located in an area where earthquakes occur quite frequently.Based on linear radiation wave theory,the interior and exterior hydrodynamic forces on pier were got by eigen-function expansion method.This method avoided solving fluid-solid model directly,and was efficient for bridge engineering.The modal analysis,spectrum analysis and transient analysis were introduced respectively and the results showed that the influence of hydrodynamic force can not be neglected for Mangjiedu bridge because the 168 meter high piers could almost all in water.
A semi-analytical and semi-numerical approach for earthquake induced hydrodynamic force on elastic rectangular hollow bridge pier was developed to study the seismic response of Mangjiedu deep-water bridge located in an area where earthquakes occur quite frequently.Based on linear radiation wave theory,the interior and exterior hydrodynamic forces on pier were got by eigen-function expansion method.This method avoided solving fluid-solid model directly,and was efficient for bridge engineering.The modal analysis,spectrum analysis and transient analysis were introduced respectively and the results showed that the influence of hydrodynamic force can not be neglected for Mangjiedu bridge because the 168 meter high piers could almost all in water.
引文
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[2]云南省地震工程研究院,漭街渡大桥复建工程场地地震安全性评价报告[R].云南,2006.
[3]Goto H,Toki K.Vibration characteristics and aseismic de-sign of submerged bridge piers[C]//Proceedings of theThird World Conference on Earthquake Engineering:Vol 2.Auckland and Wellington:NewZealand National Committeeon Earthquake Engineering,1965:107-125.
[4]Liaw C Y,Chopra A K.Dynamics of towers surrounded bywater[J].Earthquake Engineering and Structural Dynam-ics,1974,3:33-49.
[5]Yoshihiro Tanaka,Robert TH.Restoring forces on verticalcircular cylinders forced by earthquakes[J].EarthquakeEngineering and Structural Dynamics,1988,16:99-119.
[6]居荣初,曾心传.弹性结构与液体的耦联振动理论[M].北京:地震出版社,1983.
[7]Nilrat F.Berkeley.Hydrodynamic pressure and added massfor axisymmetric bodies[R].Earthquake Engineering Re-search Center,1980.
[8]Xie Lingzhi,Lai Wei,Jiang Feng,Earthquake induced inte-rior hydrodynamic force on rectangular hollow bridge pier[J].Journal of Sichuan University:Engineering Science E-dition,2009,41(2):81-84.[谢凌志,赖伟,蒋峰,地震下矩形空心桥墩内部动水力分析[J].四川大学学报工程科学版,2009,41(2):81-84.]
[9]Lai Wei,Wang Jujie,Hu Side.Earthquake induced hydro-dynamic pressure on bridge pier[J].Journal of Tongji Un-versity,2004,32(1):1-5.[赖伟,王君杰,胡世德.地震下桥墩动水压力分析[J].同济大学学报,2004,32(1):1-5.]
[10]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991.
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