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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
THREE-DIMENSIONAL STATIC BEHAVIOR OF RISERS SUBMITTED TO TRACTION AND TORSIONAL LOADS AT THE TOP. (COMPORTAMENTO ESTÁTICO TRIDIMENSIONAL DE RISERS SUBMETIDOS A CARREGAMENTOS NO TOPO DE TORÇÃO E TRAÇÃO)
Submission Author:
Santiago Granados , SP
Co-Authors:
Juan Pablo Julca Avila, Santiago Granados
Presenter: Santiago Granados
doi://10.26678/ABCM.COBEM2017.COB17-0223
Abstract
The purpose of this paper is to present a computational code for three-dimensional static analysis of slender beams subjected to torsional and tensile loads, as the case of risers used as components in system for offshore hydrocarbon production. This kind of analysis involves large geometry changes in the configuration of the riser. For this, an Euler space beam element with small deformations was developed using the corrotational approach. A scheme for the finite rotations treatment was implemented based on pseudovectors and quaternions. The equilibrium configurations were obtained based on two iterative incremental schemes: the Full Newton Raphson Method and the Cylindrical Arc Length Method with load and displacement control. Convergence criteria based on displacements, strain energy and residual force were taken into account. Straight spatial beams with geometric imperfections subjected to combined loading of torsion and compression were simulated in order to obtain satisfactory comparative results. Simulations with imposition of displacements on top of a curved catenary beam were also performed and compared satisfactorily. This computational code is able to construct slender beam equilibrium configurations until the beginning of the stability loss.
Keywords
Submarine risers, nonlinear analysis, geometric nonlinearity, Finite Element Method, structural stability.
