Abstract
The present study was triggered by the need to verify and optimize the primary constructive solution, for custom large tubes (section lengths larger than 1000 mm), under the gravity and pressure loads. The cases presented needed to be checked for the reinforcement design. Given the complex tridimensional geometry of the axisymmetric shell structures, the basic shape of the tubes was modelled, with its actual thickness. FEA was used to check the model under static loads and buckling. In order to optimize the weight, an alternative welded reinforcement's grid design was developed and checked for stability. Optimal welding sections along ribs in longitudinal and transversal directions were identified for easier design and further costs reduction.
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