船体结构极限海况下逐次崩溃行为研究

研究船体结构在极限海况下所遭受的载荷以及相应的结构逐次崩溃行为对于确保在航船舶的安全或是设计出合理安全可靠的船舶结构,具有重要的意义。在该文的研究中,首先用基于势流理论的三维奇点分布法进行作用于船体的载荷和船体运动的计算;将得到的随时间变化的载荷施加到整船结构模型上;然后运用MSC.Marc软件,考虑几何非线性和材料非线性,进行结构逐次崩溃分析,可得到结构的极限承载能力。在明确作用于船体的外力和结构的耐力以后,即可进行船体结构安全性评估;可通过加大崩溃区域的板厚或加强筋尺寸的方式来提高结构的承载能力,增加船体结构的安全度。

RESEARCH ON PROGRESSIVE COLLAPSE BEHAVIOUR OF SHIP STRUCTURES IN EXTREME SEAS

Research on the subjected loads and progressive collapse behaviour of ship structures has implications in ensuring the safety of navigating ships, making designs safer, and designing rational ship structures. In this research, the loads/motion analysis is performed using the three dimensional singularity distribution method based on potential theory. The obtained loads with time history are applied to the entire structural model. Progressive collapse analysis is performed by MSC.Marc considering geometrical and material nonlinear behaviours. The ultimate capacity of the ship structure is thus obtained. Assessments on structural safety can be conducted when the external loads and structural capacity are known. The degree of safety can be enhanced by increasing the plating thickness or stiffener size in the collapse region.