三向载荷联合作用下的大型集装箱船结构可靠性研究

大型集装箱船（LCS）具有较大的甲板开口，抗扭刚度非常低。在恶劣海况下航行时，大型集装箱船可能会遭遇斜浪的作用，此时船体将受到三向载荷的联合作用，水平波浪弯矩和扭转波浪弯矩可能会接近甚至超过垂向波浪弯矩，船体可能因发生组合变形而破坏。因此有必要研究大型集装箱船在三向载荷联合作用下的结构可靠性。在研究三向载荷联合作用下各维度极限强度的相互关系的基础上，提出了大型集装箱船的极限承载能力的可靠性评估方法，并对目标船在各浪向角下的结构可靠性进行评估。结果表明：目标船在0°浪向角下的失效概率最高；考虑水平波浪弯矩影响后目标船的结构可靠性有所降低；扭转波浪弯矩对目标船船中剖面的结构可靠性影响较小。

Structural reliability research on large container ships under combined three-dimensional load

The large container ship (LCS) has a larger deck opening. Therefore, the torsional stiffness of LCS is very low. When LCS sails in rough sea, it may encounter a slanting wave condition and be subjected to combined three-dimensional load. Under these conditions, the horizontal and torsional moments may approach or even exceed the vertical bending moment, and the hull may be damaged by combined deformation. Therefore, it is necessary to study the structural reliability of the LCS under the combined three-dimensional load. We considered the three-dimensional load to establish the interaction equations, established the ultimate strength reliability assessment method of LCS based on combined three-dimensional load effect, and calculated the structural reliability of an LCS in each wave direction. The results show that the ship failure probability is the highest under the 0° wave angle; the structural reliability of the target ship is reduced under the effect of the horizontal wave moment; on the midship, the torsional wave bending moment has little effect.