Abstract
Intubular jointsofoffshoreplatforms, jointsmay exhibitconsiderableflexibilitysincethematerialsinthechord members near the intersection zone of brace-chord behave as shell-like structures. The resulting flexibility may have sig- nificant effects on the local and overall behavior of offshore platforms. This study describes the derivation of a three-di- mensionaljointflexibilityelement whichisbasedonphysical interpretationofbehaviorofatubularjointupondeformation. Theelementisdevelopedonthebasisofflexibilitymatrixand implemented in a finite element program to account for local joint flexibility effects in numerical models of jacket-type offshore platforms. Results are validated by more sophisti- cated multi-purpose software and compared against conven- tional rigid-joint models which are widely employed in practice. According to the results, the accuracy of response predictionsisimprovedwhentheeffectsofjointflexibilityare considered. This model can be used for predicting more ac- curate response of jacket-type offshore platforms.
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