dynamic analysis of jackup.pdf

自升式的动态分析

ABSTRACT: As mobile jack-up drilling rigs continue to move into deeper waters and harsher environments  there is an increased need to understand their behaviour under storm loading conditions. To improve the assessment of jack-ups for a specific site it has become necessary to analyse these units in three dimensions  with models that appropriately reflect the physical processes occurring. This motivated the development of a  computer program (SOS_FE3D) that takes a balanced approach to all three inter-related components of the  structure, the foundations and the environmental loading in three dimensions. Geometrical structural nonlinearities are incorporated using a path-dependent formulation of beam-column theory to specify an incremental  stiffness matrix. The program implements a six-degree of freedom strain-hardening plasticity model to simulate the soil-structure interaction and, when fully developed, advanced formulations for environmental loads.  In this paper, the results of three-dimensional jack-up analyses are presented and compared with twodimensional simulations, and the importance of dynamic assessments will also be highlighted.

摘要:随着移动自升式钻井平台不断向更深的水域和更恶劣的环境移动人们越来越需要了解它们在风暴载荷条件下的行为。为了改进某一特定地点自升式钻井平台的评估，有必要对这些设备进行三维分析用模型恰当地反映发生的物理过程。这促使了a计算机程序(SOS_FE3D)，它采用平衡的方法处理所有三个相互关联的组件结构、基础和环境荷载三个维度。几何结构nonlin采用梁柱理论的路径依赖公式来指定增量刚度矩阵。该方案实现了一个六自由度应变硬化塑性模型，以模拟土-结构相互作用，并在充分开发时，为环境载荷提供先进的公式。

本文介绍了三维自升式分析的结果，并将其与两个二维模拟进行了比较，并强调了动态评估的重要性。