Abstract

This paper focus on the global structure strength analysis of a Tension Leg Platform (TLP) based on the design wave approach, the global structural analysis of the Tension Leg Platform is to ensure the hull global structural integrity under design environmental conditions, then to check if the design scheme is feasible. Firstly, a global FEM model of the entire TLP was established, the hull structure was modeled in detail, whilst the deck structure was represented through a simplified deck beam model. A hydrodynamic analysis for operation and extreme conditions were conducted to get the design wave parameters for critical wave loads. Then, wave loads were mapped to the global structure finite element model, the tendons were modeled as spring element which represents 6 degrees of freedom and rotations. Stress responses are computed by SESAM using the design wave approach. Maximum stresses in the form of equivalent stress (von-Mises) are computed for the passage of a wave characterized by height and period. The maximum stresses include the combined effects of static and dynamic loading. The maximum stress and its distribution trends, control elements were obtained by finite element analysis according to critical wave heading, wave periods, wave heights and wave positions. Results and analysis method proposed in this paper can be used as reference for strength analysis of other offshore platforms.

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