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| Failure paths identification and progressive collapse mechanism analysis of offshore jacket platforms |
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LIN Hong1,2, CHEN Guoming1, ZHU Benrui3, LIU Hongbing1, ZHANG Yu2, LI Ping2
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(1.Center for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao 266580, China;2.College of Pipeline and Civil Engineering in China University of Petroleum,Qingdao 266580, China;3.School of Civil Engineering, Tianjin University, Tianjin 300072, China)
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| Abstract: |
| In order to analyze the progressive collapse problem of jacket platforms resulted from "local failure", a failure path searching method was presented, and a failure probability calculating process was developed by using incremental loading method, in which the uncertainty of candidate failure components and the stochasticity of external loads were considered. Through simulation, all possible failure paths were sought out, and the most likely failure sequence was identified. Then, considering a specific failure spreading path, the dynamic effects of damaged platform and the rule of internal force redistribution were studied using alternative load path (ALP) method, and the progressive collapse mechanism was revealed. The analysis results indicate that:when a leg member fails, the above horizontal brace will become the new vertical load path through the plastic hinge mechanism, and then the adjacent leg member will become a weak point due to severe internal force redistribution phenomenon, therefore the platforms are prone to buckling failure. |
| Key words: offshore jacket platform failure paths progressive collapse internal force redistribution alternative load path (ALP) method |
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