半潜式钻井平台承载力极限状态设计张延昌.pdf

Structural design of a semi-submersible drilling platform in ultimate limit state ZHANG Yan-chang1 LIU Kun2 WANG Pu1 WANG Zi-li2 (1. Marine Design Research Institute of China, Shanghai 200011, China; 2.School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003) Abstract: This paper carries out the research on the design of a semi-submersible drilling platform in the Ultimate Limit State (ULS). It firstly introduces the Ultimate Limit State (ULS), analysis the methods for the ultimate strength and the strength criteria. Then, the ultimate strength of a stiffened plate has been simulated by the nonlinear fi nite element package ABAQUS, and the numerical simulation analysis technologies are developed through the investigation of analysis methods, effects of initial defl ection, results analytical technology, and so on. Furthermore, they are applied to analyze the structural models, load models and boundary conditions of the semi-submersible drilling platform, study the ultimate forces and damage modes of the target platform under the transverse split force, longitudinal shear force and longitudinal torsion, and research the effect of equivalent models and stiffened models on the results and computational effi ciency, in order to propose the engineering numerical analysis technologies for the ultimate strength of the semi-submersible platform. Finally, based on the partial safety-factor criterion, it puts forward the complete structure ultimate strength criteria for the semi-submersible platform and conducts the evaluation of the target platform, and concludes and