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《Natural Gas Industry》 2006-12
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DYNAMIC RESPONSE ANALYSIS ON GAS PIPLINES EXPOSURE TO ICE-INDUCED VIBRATION ON OFFSHORE PLATFORM

Zhang Dayong, Yue Qianjin, Li Gang, Zhou Qing (Department of Engineering Mechanics, State Key Laboratory of Structure Analysis of Industrial Equipment·Dalian University of Technology).  
Sea ice will cause the offshore jacket platform structure to vibrate strenuously in Bohai Sea. The ice-induced vibrations of offshore structure will not only result in the fatigue failure of jacket but also lead to the associated accidents of pipelines on the platform. So it is necessary to study on the problem of gas pipelines exposure to ice-induced vibration on the platform. This paper analyzes dynamic response by ice-induced vibration for gas pipelines on the platform based on the data monitored on the platforms of JZ202 in Bohai Sea. Then a vibration mechanics model of gas pipelines is built up by means of elastic mechanics theory. With finite element modeling, the natural frequencies, the displacement, and the amplitude of turning angle response induced by deck vibration are calculated with full consideration put on the influence of the complex supports, devices, and elbows of pipelines. The results show that ice-induced vibration has great effect on the dynamic response for the pipeline system, which should be surely put into consideration when pipeline system is to be designed on offshore platforms in ice areas. Finally, some measures are suggested here to improve the anti-vibration performance of pipeline system.
【Fund】: 国家“863”计划项目(编号:2001AA602015)资助
【CateGory Index】: TE952
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