中文摘要：

通过海洋平台桩-土非线性弹簧模型的研究,结合桩基荷载-位移数据计算程序的编制,为工程实际应用提供简便可靠的方法。对某自升式钻井平台在完好状态和受损状态下的极限承载能力作了对比研究,通过逐级增加载荷的方法,基于精确计算模型对平台结构进行非线性分析,具体依据载荷类型、载荷作用力方向等,得到12种计算工况,研究老龄平台在受损状态下对强度储备的影响,并评估其安全状况。考虑外界荷载的随机性和不确定性,基于极限承载能力分析,采用等效荷载法,运用JC法进行平台体系可靠性计算,分析完好平台与老龄平台的结构体系可靠性,并作对比研究。

英文摘要：

Through the research on the pile-soil nonlinear spring model of offshore platforms, this paper develops the program to calculate the load-displacement of the pile, so as to give a simple and reliable method for ultimate load-carrying capacity analysis for engineering application. The ultimate load-carrying capacity of the jack-up platform is compared under both the intact state and damaged state. By using incremental loading method, the nonlinear analysis is carried out on the detailed platform model. According to different types and directions of the loads, 12 kinds of calculation conditions are applied to analyze the influence of the damaged state on the reserve strength. Considering the randomness and the uncertainty of the loads, and using the equivalent load method, the system reliability of both the intact and damaged jack-up platform is calculated through the JC method.