地震与波浪荷载作用下偏心海洋平台扭转耦联参数影响分析
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摘要
质量偏心和刚度偏心是结构偏心的两种重要形式,该文从单层平台结构体系在地震与波浪环境荷载作用下的一般振动方程出发,推导得到了可以考虑平台不同偏心形式的振动方程。在此基础上,针对不同水深的导管架海洋平台典型算例进行了数值计算,分析了三种荷载工况(地震作用、波浪作用、地震波浪耦合作用)时,平台结构的偏心形式、偏心率以及目标分析点的位置对偏心平台扭转耦联响应的影响规律,同时还分析了地震、波浪荷载强度对偏心平台扭转耦联响应的影响规律。分析结果表明:平台结构的偏心形式、目标点位置以及偏心率的大小都会影响偏心平台的扭转耦联响应,同时地震与波浪的联合作用对不同场地上不同周期类型的平台影响不尽相同,在某些情况下有必要考虑地震与波浪的联合作用对海洋平台进行抗震分析。
Mass eccentricity and stiffness eccentricity are two key forms of asymmetric structures.Based on the general dynamic equation of one-storey asymmetric offshore platform subjected to wave and earthquake loadings, the vibration equation considering different eccentricity forms is deduced in this paper.At different water depths, the performances of asymmetric platforms subjected to earthquake load, wave load, or simultaneously both, are numerically analyzed.The torsionally coupled effects are studied considering the variation in eccentricity form, eccentric ratio and target component's location.In addition, the influence of environmental action intensity on torsionally coupled effect is analyzed.The numerical results show that eccentricity form, eccentric ratio and target position have non-negligible influence on torsionally coupled effects.Furthermore, the influences of combined environmental actions are different for asymmetric platforms with different periods or in different foundation conditions.
Mass eccentricity and stiffness eccentricity are two key forms of asymmetric structures.Based on the general dynamic equation of one-storey asymmetric offshore platform subjected to wave and earthquake loadings, the vibration equation considering different eccentricity forms is deduced in this paper.At different water depths, the performances of asymmetric platforms subjected to earthquake load, wave load, or simultaneously both, are numerically analyzed.The torsionally coupled effects are studied considering the variation in eccentricity form, eccentric ratio and target component's location.In addition, the influence of environmental action intensity on torsionally coupled effect is analyzed.The numerical results show that eccentricity form, eccentric ratio and target position have non-negligible influence on torsionally coupled effects.Furthermore, the influences of combined environmental actions are different for asymmetric platforms with different periods or in different foundation conditions.
引文
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[2]Bea R G.Nonlinear performance of offshore platforms in extreme storm waves[J].Journal of Waterway,Port,Coastal,and Ocean Engineering,1996,122(2):68―74.
[3]Isaacson Michael,Wu Songren.Wave and earthquake effects on axisymmetric offshore structures[J].Applied Mathematics and Mechanics,1984,5(4):1437―1447.
[4]Etemad A K,Gharabaghi A R M,Chenaghlou M R.Behavior of fixed jacket-type offshore platforms subjected to simultaneously acting wave and earthquake loads[C]//ASME.Paper presented at Proceedings of the23rd International Conference on Offshore Mechanics and Arctic Engineering.Vancouver,Canada:ASME,2004:893―900.
[5]何晓宇,李宏男.地震与波浪联合作用下海洋平台动力特性分析[J].海洋工程,2007,25(3):18―25.He Xiaoyu,Li Hongnan.Dynamic analysis of offshore platform under seismic action and wave action[J].The Ocean Engineering,2007,25(3):18―25.(in Chinese)
[6]何晓宇,李宏男.波浪与地震对小尺度桩柱的共同作用研究[J].地震工程与工程振动,2007,27(5):139―145.He Xiaoyu,Li Hongnan.Research on piles with small dimension under the combination of seismic and wave action[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(5):139―145.(in Chinese)
[7]Newmark N M.Torsion in symmetrical buildings[C]//IAEE.Paper presented at Proceedings of4th World Conference Earthquake Engineering.Santiago,Chile:IAEE,1969:19―32.
[8]Hejal Reem,Chopra A K.Lateral-torsional coupling in earthquake response of frame buildings[J].Journal of Structural Engineering,1989,115(4):852―867.
[9]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转振动效应[J].建筑科学,2000,16(1):1―6.Xu Peifu,Huang Jifeng,Wei Chengji.Response of torsional vibration of tall building structures induced by seismic action[J].Building Science,2000,16(1):1―6.(in Chinese)
[10]李宏男.结构多维抗震理论[M].北京:科学出版社,2006.Li Hongnan.Earthquake resistance theory for multi-dimension structures[M].Beijing:Science Press,2006.(in Chinese)
[11]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3):250―261.Xie Lili,Zhai Changhai.Study on the severest real ground motion for seismic design and analysis[J].Acta Seismologica Sinica,2003,25(3):250―261.(in Chinese)
[12]Jin Qiao,Li Xin,Sun Ning,Zhou Jing,Guan Jiong.Experimental and numerical study on tuned liquid dampers for controlling earthquake response of jacket offshore platform[J].Marine Structures,2007,20(1):238―254.
[13]Kareem Ahsan,Hsieh C C,Tognarelli M A.Frequency-domain analysis of offshore platform in non-Gaussian seas[J].Journal of Engineering Mechanics,1998,124(6):668―683.
[14]Mostafa Yasser E,Naggar El,Hesham M.Response of fixed offshore platforms to wave and current loading including soil-structure interaction[J].Soil Dynamics and Earthquake Engineering,2004,24(4):357―368.
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