P-Δ effects on strength analysis of jack-up legs structures
In operating status, the most different feature between a jack-up platform and a fixed platform is a large hull with heavy loads supported by slender and long legs. When jack-up platforms are impacted by designed environmental loading, due to large lateral displacements P-Δ effects on jack-up legs structures caused by hull weight should be considered. The effects have been specified in current standards, however the problem is still being studied to approach to the more accuracy results, especially in case dynamic effects of wave loads on the structures are significant. This article aims to analyse, assess and compare the P-Δ effects on the legs strength in operation of the platforms based on method of structural large strain analysis and method of current standards with quasi-static limitation. The research results are applied for Tam Dao 05 jack-up platform to evaluate preliminary on degree of influence of the effects corresponding to each method in actual calculations.
P-Δ effects; strength; jack-up legs structures.
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