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• W2017429565 abstract "ABSTRACT This paper explores the application of computerized finite element modeling techniques to the design of complex joints such as those used in semisubmersible drilling platforms. The structural complexity of such joints results in complex stress fields and a lack of suitable analytical methods has caused designers to rely heavily on intuition and simple cook book formulas. The advent of the computerized finite element technique fills the analytical void, but experience has shown that practical economic considerations apply certain limits here also. The joint analyst seldom has the time or money available to subdivide his finite element mesh until he has achieved convergence to the exact solution. The purpose of this study was to develop guidelines for finite element mesh layouts which would yield stress field information adequate for the joint designer's needs. Five typical joint designs were modeled by finite elements j three by manually laying out the mesh and two via an automatic mesh generation program recently developed at Southwest Research Institute. These finite element idealizations were analyzed using the computer program STARDYNE. The results are compared with experimental stress analyses of scale models performed at Southwest Research Institute. For the cases studied, it is concluded that the finite element method gives results which are within about 20 percent of the experimental results if the elements near cylinder intersections have an arc angle of about 15 degrees along the intersection line and a length of square root rt/2 normal to the intersection line. INTRODUCTION The design of the complex joints of offshore drilling rigs is a problem frequently encountered for which no simple solution is available. For example, in the case of large semisubmersible and fixed platforms in deep water, the joints are frequently stiffened with rings, gussets, bulkheads, and insert plates. This constitutes a relatively complex structure so that powerful analytical techniques must be used to produce an adequate design. Selective reinforcement of a joint at critical regions is the objective of a typical joint design. Intuition and cook book methods play an important role in this process. However, too much reliance on these methods may prove dangerous. In general, most designers are well aware that, without detailed knowledge of the stress distribution in a complex joint, one may tend to stiffen an apparently weak area with a resulting increase in stresses in other areas of the joint. Until recently the only effective means of determining stresses in a complex joint has been to place strain gages on scale models of a proposed structure and locate problem areas by a cut-and-try technique, an expensive procedure at best. In the last few years, however, the finite element method, coupled with the digital computer, has provided the structural analyst with a powerful and cost-effective tool to analyze these joints." @default.
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• W2017429565 date "1973-04-28" @default.
• W2017429565 modified "2023-10-05" @default.
• W2017429565 title "Finite Element Analysis of Complex Joints" @default.
• W2017429565 doi "https://doi.org/10.4043/1823-ms" @default.
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