Coupled and uncoupled solutions for the nonlinear dynamic behaviour of guyed deep water platforms

Abstract

The platform presented in this work is a compliant tower in which the structural elements that produce the righting forces are guylines. The behaviour of this tower, under operating and storm conditions, is investigated by analysing the following models: a three-dimensional model for eigenvalue and nonlinear static analysis, a stick model and a coupled model, for nonlinear dynamic analysis. The equilibrium equations governing the nonlinear static analysis problem are solved using the Newton-Raphson incremental-iterative method. The eigenvalue problem is solved through the subspace iteration method. The equations of motion describing the nonlinear dynamic analysis problem are integrated using the Newmark method.