某特大桥梁钢吊箱结构随机动力响应分析
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摘要
根据随机振动原理,对某特大型桥梁6号钢吊箱进行随机动力响应分析;通过对比静、动力分析的结果,总结波浪荷载作用下钢吊箱的受力特性。研究结果表明,钢吊箱考虑附连水质量时,结构自振频率降低,但其动力响应并不大,建议设计吊箱时根据结构的安全性要求,乘以1.1~1.3的安全系数。
Based on the theory of stochastic vibration,random dynamic analysis of No.6 steel suspended cofferdam of a super large bridge was carried out.The mechanical characteristics of steel suspended cofferdam under wave load actions were studied by comparing the results of static and dynamic analysis.Analysis results show that the natural frequencies of steel suspended cofferdam structure decrease when additional water mass is considered,dynamic responses of the structure are not intense.It is suggested that a safety factor of 1.1~1.3 should be multiplied in structure design according to safety requirement of steel suspended cofferdam.
Based on the theory of stochastic vibration,random dynamic analysis of No.6 steel suspended cofferdam of a super large bridge was carried out.The mechanical characteristics of steel suspended cofferdam under wave load actions were studied by comparing the results of static and dynamic analysis.Analysis results show that the natural frequencies of steel suspended cofferdam structure decrease when additional water mass is considered,dynamic responses of the structure are not intense.It is suggested that a safety factor of 1.1~1.3 should be multiplied in structure design according to safety requirement of steel suspended cofferdam.
引文
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[10]李黎明.ANSYS有限元分析实用教程[M].北京:清华大学出版社,2005.LI Li-ming.Practical course on ANSYS finite elementanalysis[M].Beijing:Tsinghua University Press,2005.
[11]JTJ 213—98,海港水文规范[S].JTJ 213—98,Code for harbour hydrology[S].
[2]Sarpkaya T,Issacson M.Mechanics of wave forces on off-shore structures[M].Litton Educational PublishingInc,1981.
[3]Chakrabarti S K.Hydrodynamics of offshore structures[M].Heidelberg:Springer Verlag Berlin,1987.
[4]Faltinsen O M.Sea loads on ships and offshore structures[M].Cambridge:Cambridge University Press,1993.
[5]谢小松,徐伟,宋灿,等.深水高桩承台哑铃状钢吊箱动力特性分析[J].建筑技术,2006,37(5):384-385.XIE Xiao-song,XUWei,SONG Can,et al.Dynamicalproperty analysis of elevated pile foundation of suspendedsteel cofferdam in deep water[J].Architecture Technolo-gy,2006,37(5):384-385.
[6]谢小松,徐伟,宋灿,等.深水高桩承台哑铃状钢吊箱在地震作用下的响应分析[J].结构工程师,2005,21(6):43-45.XIE Xiao-song,XU Wei,SONG Can,et al.Responseanalysis of elevated pile foundation dumbbell-shape steelsuspending cofferdam in deep water under seismic action[J].Structural Engineers,2005,21(6):43-45.
[7]王勖成.有限单元法[M].北京:清华大学出版社,2003.WANG Xu-cheng.Finite element method[M].Bei-jing:Tsinghua University Press,2003.
[8]Yang Y,Iemura H.Seismic response of offshore structurein random seas[J].EESD,1989,(18):965-981.
[9]聂武,刘玉秋.海洋工程结构动力分析[M].哈尔滨:哈尔滨工程大学出版社,2002.NIE Wu,LIUYu-qiu.Dynamic analysis on ocean engi-neering structures[M].Harbin:Harbin Engineering Uni-versity Press,2002.
[10]李黎明.ANSYS有限元分析实用教程[M].北京:清华大学出版社,2005.LI Li-ming.Practical course on ANSYS finite elementanalysis[M].Beijing:Tsinghua University Press,2005.
[11]JTJ 213—98,海港水文规范[S].JTJ 213—98,Code for harbour hydrology[S].
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