中文摘要：

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研究。通过逐级增加载荷的方法，对平台结构进行非线性分析，具体依据基础约束模型、载荷类型、载荷作用力方向，得到36种计算工况，分别进行完好平台和老龄平台的极限承载分析。根据结构极限状态判定准则分析得出平台的极限承载能力，计算平台的强度储备系数RSR，从而分析平台的强度储备。同时，研究分析了老龄平台在受损状态下对强度储备的影响，最后根据计算结果，对老龄平台的安全状况进行评估。

英文摘要：

The investigation on the ultimate load-carrying capacity for jack-up platforms in both intact situation and damaged situation is presented in this paper. The non-linear analysis of platform structures is performed by loading step by step. According to different foundation restrict models, load types and load acting directions, the ultimate load-carrying capacity analysis for intact and aged platforms in 36 computing load cases is carried out respectively. The ultimate load-carrying capacity is obtained in accordance with the limit state criterion, the RSR of platform is calculated, and thereby the strength reserve is analyzed. The influence of damage on strength reserve is investigated to assess the safety condition of aged platforms.