Study on the Similarity Ratio during the collision between Ship and Offshore Jack-up Platform

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (7) : 15-22.

Liu Kun1, Bao Jie1, 2，Wang Zili1, George Wang1,3

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Abstract

Offshore platform is one of the major components for offshore exploitation, for it is the main operating base for exploring, drilling and mining of offshore oil and gas. However, ship collision is a major risk to their safety. It is very important to understand structural behavior of offshore platform subject to ship collision. Full-scale ship collision test is the most reliable method to evaluate collision resistance of platform structure. But it is too costive to be affordable. Therefore, scale model experiment by similarity ratio might be a good choice in reality. Based on the second similarity theory, this paper uses dimensional analysis to acquire the similar relations among the various physical quantities during the ship-offshore jack-up platform collision, providing important data for planning model tests and the confirmation of the test parameters. Combined with finite element simulation technology, taking typical T type and K type joints in platform as the research objects, collision models are executed in different scale to compare and argue the reliability of the similarity theory. The results show that the dynamic responses such as structural damage deformation、collision force and energy absorption of scale models under impact load are in good consistency with prototypes. The research results can provide technical supports for collision model test design of the large platform structures.

Key words

ship collision / similarity ratio / dimensional analysis / numerical simulation / model test

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Liu Kun1, Bao Jie1, 2，Wang Zili1, George Wang1,3. Study on the Similarity Ratio during the collision between Ship and Offshore Jack-up Platform[J]. Journal of Vibration and Shock, 2016, 35(7): 15-22

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