基于附加质量法的桥墩地震动水压力分析与实例研究
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摘要
以南京长江三桥南墩为分析对象基于附加质量法对地震动水压力下大跨度桥梁深水基础的动力特性进行分析:包括墩自振特性的研究、墩顶部位移和加速度时程分析以及动水压力沿深水桥墩高程的分布情况,并将结果与南京长江三桥南墩振动台试验结果进行比较。为验证附加质量法的计算结果,建立包含水体的有限元计算模型,对动水压力的影响进行分析。结果表明动水压力对桥梁的动力特性有较大的影响:从动水压力数值上看,随着水深增大动水压力值呈二次抛物线形式增加;就动水压力对墩位移和加速度的影响而言,附加质量法与有限元模拟方法的结果基本吻合。
In the present paper,hydrodynamic pressure on southern pile-cap pier of the Nanjing Third Yangtze River Bridge was evaluated with added mass approach to study the dynamical behavior of the pile-cap pier during earthquake in deep water.Vibration properties and dynamic response of this pier as well as the distribution of hydrodynamic pressure along pier were analyzed.A comparison was made between the results from added mass methods and those from a shaking table test on southern pile-cap pier of the Nanjing Third Yangtze River Bridge.Both of them indicate that hydrodynamic pressure must be taken into consideration when researching dynamic responses of piles in deep water.To verify the results from added mass approach,a finite element model of pile group of Nanjing Third Yangtze River Bridge was built for comparison.The results showed hydrodynamic pressure distribution along the pier was in a parabola form and added mass approach has similar accuracy to the finite element method in terms of displacement and acceleration of pile group model.In view of the influence of hydrodynamic pressure on dynamic response of deep water bridge,a evaluation method based on added mass approach is needed to analyze hydrodynamic pressure on deep water bridge.
In the present paper,hydrodynamic pressure on southern pile-cap pier of the Nanjing Third Yangtze River Bridge was evaluated with added mass approach to study the dynamical behavior of the pile-cap pier during earthquake in deep water.Vibration properties and dynamic response of this pier as well as the distribution of hydrodynamic pressure along pier were analyzed.A comparison was made between the results from added mass methods and those from a shaking table test on southern pile-cap pier of the Nanjing Third Yangtze River Bridge.Both of them indicate that hydrodynamic pressure must be taken into consideration when researching dynamic responses of piles in deep water.To verify the results from added mass approach,a finite element model of pile group of Nanjing Third Yangtze River Bridge was built for comparison.The results showed hydrodynamic pressure distribution along the pier was in a parabola form and added mass approach has similar accuracy to the finite element method in terms of displacement and acceleration of pile group model.In view of the influence of hydrodynamic pressure on dynamic response of deep water bridge,a evaluation method based on added mass approach is needed to analyze hydrodynamic pressure on deep water bridge.
引文
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[5]钟明全,姚小松,潘亦苏.奉节长江公路大桥桥墩地震动水压力的分析研究[C/]/第一届全国公路科技创新高层论坛论文集公路设计与施工卷,2002
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[11]张国明,宋波.动水压力对深水桥梁性能设计的影响[J.]北京科技大学学报,2009,31(9):1086-1094(ZhangGuoming,Song Bo.Effect of hydrodynamic pressure onperformance-based design of a deepwater bridge[J.]Journalof University of Science and Technology Beijing,2009,31(9):1086-1094(in Chinese))
[2]Savage J L.Earthquake studies for pit river bridge[M.]Civil Engineering,1939
[3]Clough R C.The finite element method in plane stressanalysis[C/]/Proceedings 2nd ASME Conference onElectornic Computation.Pittsburgh,1960
[4]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:自然科学版,2004,32(1):1-5(Lai Wei,Wang Junjie,Hu Shide.Earthquake induced hydrodynamicpressure on bridge pier[J.]Journal of Tongji University:Natural Science Edition,2004,32(1):1-5(in Chinese))
[5]钟明全,姚小松,潘亦苏.奉节长江公路大桥桥墩地震动水压力的分析研究[C/]/第一届全国公路科技创新高层论坛论文集公路设计与施工卷,2002
[6]李富荣,陈国兴,王志华.考虑动水压力影响的桥梁大型群桩基础地震反应分析[C/]/第三届全国防震减灾工程学术研讨会论文集,2007
[7]李海霞,唐清华,周仲元.考虑动水压力的连续刚构桥地震反应分析[J.]四川建筑,2005
[8]Morison J R,O’BrienM P,Johnson J W,et al.The forceexerted by surface wave on piles[J.]Petroleum Transactions,AIME,1950,189:149-154
[9]李富荣,陈国兴,王志华.考虑动水压力影响的单柱式桥墩地震反应分析[J.]地震工程与工程振动,2008,28(2):114-121(Li Furong,Chen Guoxing,Wang Zhihua.Seismic responses of single-column pier considering theeffects of hydrodynamic pressure[J.]Journal of EarthquakeEngineering and Engineering Vibration,2008,28(2):114-121(in Chinese))
[10]南京长江第三大桥建设指挥部.南京长江第三大桥主桥技术总结[M.]北京:人民交通出版社,2005
[11]张国明,宋波.动水压力对深水桥梁性能设计的影响[J.]北京科技大学学报,2009,31(9):1086-1094(ZhangGuoming,Song Bo.Effect of hydrodynamic pressure onperformance-based design of a deepwater bridge[J.]Journalof University of Science and Technology Beijing,2009,31(9):1086-1094(in Chinese))
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