基于疲劳损伤和倒塌事故的导管架平台结构风险分析

基于风险的检验技术已成为海洋工程领域的研究热点,其优势在于优化检验范围,减少检验成本。通过有限元方法对导管架平台结构的疲劳损伤和倒塌失效进行数值计算,并基于可靠性理论对平台结构关键构件的疲劳失效概率以及该构件疲劳破坏后平台结构的整体倒塌失效概率进行确定,形成风险矩阵,以制定相应的检验计划。在此基础上,对南海某导管架平台结构进行了定量风险评估,形成关键节点和构件的风险矩阵,并给出了相应的检验目标以指导制定检验计划。本文工作可为导管架平台结构制定合理高效的检验计划,在保障平台结构安全作业的同时降低运行费用。

Risk analysis of jacket platform structure based on failuare probabilty of fatigue damage and collapse

The risk-based inspection (RBI) technology has become a popular research topic in offshore industry,and its advantage lies in optimizing the inspection scope and reducing the inspection cost.In this study,the finite element method (FEM) is adopted to analyze the fatigue damage and the collapse failure.The fatigue failure probability of the key components of a platform structure is determined based on the reliability theory.Meanwhile,the collapse failure probability of the platform structure is analyzed when the key components are broken.The risk matrix is calculated with the results above for the platform to draw up the inspection plan.Finally,the quantitative risk assessment of a jacket platform at the South China Sea is performed,the risk matrix of key points and components is generated to inform the inspection target and plan.This study can aid formation of the inspection plan for the jacket platform reasonably and efficiently.The cost can be reduced under the safe operation conditions for platform structures.