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Fixed Jacket Platform extraordinary Study of vibration and vibration reduction measures


Possible collisions, and perfusion of cement platform to further improve the lateral stiffness,[link widoczny dla zalogowanych], and therefore its damping effect than the mere elimination of lead pipe pile and the relative motion between the better. Table 4, the theory of various vibration damping effect of the program prototype platform damping effect in Table 5 4 Conclusions (1) The abnormal vibration of the platform because the pile and the jacket of Volume 1, between the relative motion reduces the natural frequency of the platform The closer to the excellent frequency wave forces, resulting in increased dynamic response. (2) pile and the jacket will cause relative motion between the collisions increase the vibration platform. (3) vibration reduction measures should be used pile and grouting and other methods to eliminate relative movement between the jacket and improve the platform,[link widoczny dla zalogowanych], the natural frequency of vibration to achieve the purpose. (4) vertical leg platform of non-filling pile calculation of natural frequency of pile should be considered no contact with the jacket of extreme conditions. (5) Non-grouting piles should not be used vertical leg platform leg structure. References 1 Liu Jinkun and so on. China Offshore Platform, 1999,14 (4) :23-252HuangWP, JiangJT, YangYC. In, estigationonthecauseofexcessivevibrationofajackettypeoffshorePlatforms. In: TheProceedingsoftheFirstAsianandPacieicCoastalEngineeringConference, Dalian · 2001; 2:624-6293 Huang Weiping. Yang Yongchun, Jiang Ji same. Vertical Non-grouting pile platform jacket leg vibration of super-normal. Vibration Engineering, 2002; l5 (3) :368-3714 Huang Weiping, Hua-Jun Li, Juan. Vertical Non-grouting pile platform jacket leg lateral stiffness of the simplified calculation. Engineering Mechanics,[link widoczny dla zalogowanych], 2002; Suppl :797-8OO5HuangWP, YangYC. LiHJ. Measurementofexces-sivevibrationofaJacketPlatform. ProgressinSafetyScienceandTechnology,[link widoczny dla zalogowanych], Tai'an2002; Ⅲ · PartA: 5O2-5066 Zhu Shijie such as translation. Model and experimental techniques. Beijing: China Railway Press, 1989TestonAbnormalVibrationandVibrationReductionofFixedOffshoreJacketPlatformHuangWeipingYangYongchunLiHuajun (CollegeofEngineering.OceanUniversityofChinaQingdao, 266071) AbstractThetestoffour1/20scalemodelsofoffshorejacketplatformwithverticalnon-groutedpilesarecarriedouttOin-vestigatetheperformanceofwave-inducedvibrationandthemeasureofmitigation. Theconclusionisthattheabnormalvibra-tionisduetOtherelativeoscillationbetweenthepilesandlegsaswellastheimpactetweenthepileandtheleginthecaseofseabedscouring. Therefore. thesuggestionisputforward. Keywords: offshoreplatform; jacket; modeltest; analogy; structuralvibration Huang Weiping male first author,[link widoczny dla zalogowanych], professor, in March 1954 students. Tel: (0532) 5901620; E-mail: wphuang @ mail. OUC. edu. cn

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