Onshore concrete structures are huge structures which are designed using the best technology available. Following the SLEIPNER accident two years ago, structural details in new platforms have been investigated for capacity using non-linear material finite element analysis. Such analyses are more detailed in the complex areas than the global finite element analysis. This paper discuss the different analyses required in order to predict the capacity in complex geometric areas, derive additional force resultants due to geometric non-lineanties and include force resultants to dynamic behaviour in the general post-processing of the results from the global analysis. Examples of different analyses are shown and the accuracy of the analyses are discussed. The paper is finally passing judgement as to how the non-linear finite element analysis may be integrated into a global finite element analysis in the future. This to improve the accuracy of analysis, optimize the design and to minimize the cost of the onshore concrete structures.

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