大型海洋平台顶升塔架的稳定性分析

随着液压顶升技术的发展，通过顶升塔架完成大型海洋平台的整体合拢的技术日渐成熟和广泛。目前，国内外关于顶升塔架的稳定性相关问题研究较少，而塔架的稳定性问题是平台能否安全完成上下模块总装合拢的关键问题。本文针对如何合理的布置顶升塔架，提高塔架在海洋平台顶升过程中的稳定性问题，以有限元分析为基础，并引入接触算法定量分析塔架在外载荷作用下的稳定性问题。此外，本文定量分析装配误差、地基存在不均匀的弹性、塑性变形等建造误差对塔架稳定性的影响，包括单塔架、单侧塔架、对角塔架升沉引起的塔架稳定性损失，及单塔架、单侧塔架及对角塔架倾斜引起的塔架稳定性损失，揭示出了相关规律，为工程施工做参考。

Stability Analysis of Jacking Tower of Large-Scale Offshore Platform

With the development of hydraulic jacking technology, the method to complete the overall convergence of the large-scale offshore platform through jacking tower is becoming more mature and extensive. At present, there are few researches on the stability of the jacking tower at home and abroad. However, the stability of the tower is the key issue for whether the platform can safely complete the mate of the upper and lower modules. This paper aims at how to reasonably arrange the lifting tower and improve the stability of the tower during the lifting process of the offshore platform. Based on the finite element analysis, a contact algorithm was introduced to quantify the stability of the tower under external loads. In addition,this paper quantitatively analyzes the impact of assembly error, uneven elasticity and plastic deformation on the stability of the tower, including the loss of tower stability caused by the heave of single tower, single-side towers and diagonal towers, and the loss of tower stability caused by the angle tilt of single tower, single-side towers and diagonal towers, reveals the relevant rules and makes reference for the construction.