自升式海洋平台后服役期的疲劳强度及寿命分析

摘要

Discusses the fatigue of an aged jack-up platform changed from rabet to cantilever-beam type and new fatigue hot points appeared due to the changes mentioned above,and fatigue analyses carried out based on the calculation model of Bohai 8 jack-up platform,and the calculation and estimation of the accumulated fatigue damage of hot spot,caused by drilling load to provide new information for safe service and retrofit of this kind of aged platform structures.%根据工程中遇到的实际问题，采用不同以往的疲劳载荷，利用P-S-N方法计算了渤海8号自升式平台围井区选取点的疲劳损伤及疲劳寿命，从而预报平台的剩余疲劳寿命.本文从一个新的角度对由槽口式改装为悬臂梁式并且大部分已经进入后服役期的自升式平台的疲劳问题进行了分析研究，从而为此类平台的安全性评估及维修提供了新的依据，同时也扩展了平台疲劳分析的思路.