【摘要】 大型海上浮式平台是一种特殊的海上结构物，其轴承销轴连接结构具有较好的灵活性和适用性，为了保证大型海上浮式平台连接系统在服役过程中的安全性，有必要对该连接系统进行疲劳寿命分析。首先，以含多组轴承销轴的大型海上浮式平台连接系统为研究对象，采用多种接触形式的非线性接触分析方法进行设计工况载荷下的总体强度研究。然后，根据该平台连接系统总体强度计算结果，选取板架结构应力较大部位为关键节点，并建立有限元子模型，计算这些关键节点的热点应力，最后，采用S–N曲线累积损伤法，对该平台连接系统局部结构在改进前后的疲劳寿命进行计算和分析。结果表明：含多组轴承销轴的大型海上浮式平台连接系统加载端最外侧轴承与板架连接部位的扁钢处疲劳寿命最低，而增加加载端最外侧轴承基座板架部分整体板厚，以及开孔附近板架和扁钢厚度可有效提高疲劳寿命。本文最终提出了一套含多组轴承销轴的大型海上浮式平台连接系统疲劳强度分析方法。更多还原

【Abstract】 Large-scale offshore floating platforms belons to special offshore structures. Their bearing pin shaft connection structures have good flexibility and applicability. In order to ensure the safety of the large-scale offshore floating platform connection system during service, it is necessary to analyze its fatigue life. Firstly, the large-scale offshore floating platform connection system with multiple sets of bearing pin shaft was studied. A nonlinear contact analysis method of various contact forms was adopted to investigate the overall strength of the structure under the design working condition load. Then, the fatigue life of the platform connection system was calculated and analyzed before and after the local structural improvement. The results show that, for large-scale offshore floating platform with multiple sets of bearing pinsnajt, the lowest fatigue life appears at the flat steel of the connection between the outermost bearing and the plate-frame structure of the loading end. In addition,the fatigue life could be effectively improved by increasing the overall plate thickness of the outermost bearing base plate-frame at the loading end. The thickness of the plate-frame and flat steel near the opening should also be increased. In this paper, a set of fatigue strength analysis methods for large offshore floating platform connection system with multiple sets of bearing pin shaft is finally formed.更多还原