高桩承台动水力简便计算方法
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摘要
基于Morison动水理论,提出了作用于高桩承台的动水力简便计算方法,该方法可以应用于深水大跨度桥梁抗震设计.以南京长江三桥南塔基础为原型,利用水中振动台试验,通过对比无水和有水状态时动力荷载作用下的模型试验和计算的结果,验证了动水力简便计算方法的准确性和可靠性,并对影响动水力的主要影响因素进行了重点讨论.
A simplified calculation method of hydrodynamic force which acts on elevated pile caps was proposed on the basis of the Morison hydrodynamic force theory,and it can be applied to the seismic design of long span deepwater bridges.Shaking table tests of elevated pile caps were performed with the south tower base of the Nanjing Yangtze 3rd River Bridge as a prototype.A comparison between the results of shaking table tests and those of the calculation method under dynamic loads verified the accuracy and reliability of the proposed method.At last,the influencing factors on the hydrodynamic force were discussed.
A simplified calculation method of hydrodynamic force which acts on elevated pile caps was proposed on the basis of the Morison hydrodynamic force theory,and it can be applied to the seismic design of long span deepwater bridges.Shaking table tests of elevated pile caps were performed with the south tower base of the Nanjing Yangtze 3rd River Bridge as a prototype.A comparison between the results of shaking table tests and those of the calculation method under dynamic loads verified the accuracy and reliability of the proposed method.At last,the influencing factors on the hydrodynamic force were discussed.
引文
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[2]Zhou Y Q.Trend of the foundations of the deep-water bridges.Technol Highw Transp,2000(4):31(周一桥.桥梁深水基础的新动向.公路交通技术,2000(4):31)
[3]Chongqing Communications Research and Design Institute.JTG/TB02-01—2008 Guidelines for seismic design of highway bridges.Beijing:China Communications Press,2008(重庆交通科研设计院.JTG/T B 02-01—2008公路桥梁抗震设计细则.北京:人民交通出版社,2008)
[4]Bi J J,Ning F.Second-order radiation forces on large multi-cylin-drical offshore structures.J Hydrodyn Ser A,1993,8(3):296(毕家驹,宁风.大直径多圆柱体近海结构上的二阶辐射水动力.水动力学研究与进展A辑,1993,8(3):296)
[5]Fang Y G,Sun J.Earthquake response analysis of platform pilegroup water-soil system.China Civ Eng J,1998,31(5):56(房营光,孙钧.平台--群桩--水流--土体系统的地震反应分析.土木工程学报,1998,31(5):56)
[6]Byrd R C.A Laboratory Study of the Fluid-Structure Interaction ofSubmerged Tanks and Caissons in Earthquake:Report No.UCB/EERC-78/08.University of California:Earthquake EngineeringResearch Center,1978
[7]Akyildiz H.Experimental investigation of pressure distribution ona cylinder due to the wave diffraction in a finite water depth.Ocean Eng,2002,29(9):1119
[8]Li S S,Zhang W,Qin C R.Numerical simulation and experimen-tal study of wave force on large diameter cylindrical structure.Chi-na Harb Eng,2003(2):11(李世森,张伟,秦崇仁.大直径圆筒结构上波浪力的数值模拟与实验研究.中国港湾建设,2003(2):11)
[9]Cokgor S.Hydrodynamic forces on a partly buried cylinder exposedto combined waves and current.Ocean Eng,2002,29(7):753
[10]Lai W,Wang J J,Wei X,et al.The shaking table test for sub-merged bridge pier.Earthquake Eng Eng Vib,2006,26(6):164(赖伟,王君杰,韦晓,等.桥墩地震动水效应的水下振动台试验研究.地震工程与工程振动,2006,26(6):164)
[11]Lai W,ZhengTH,Lei Y.Theeffect of hydrodynamicdragforcein Morison equation on the seismic response of piles.SichuanBuild Sci,2007(4):163(赖伟,郑铁华,雷勇.Morison方程中动水阻力项对桥梁桩柱地震反应的影响.四川建筑科学研究,2007(4):163)
[12]Ministry of Communications of P.R.China.JTJ 213—1998Code of Hydrology for Sea Harbour.Beijing:China Communica-tions Press,1998(中国交通运输部.JTJ 213—1998海港水文规范.北京:人民交通出版社,1998)
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