基于设计波的载重3600t干货船结构强度直接计算分析

Direct Strength Analysis of 3600 DWT Dry Cargo Ship Based on Design Wave Approach

为准确评估超规范的载重3 600 t大通舱干货船的弯扭强度及变形水平,采取全船水动力分析及全船有限元直接计算的方法,对各工况下的主要载荷参数进行长期预报,推导出对应等效设计波各参数。根据等效设计波求出各工况全船所受的波浪诱导动载荷,施加到全船有限元模型上,进而对船体弯扭强度及变形水平进行评估。比较了单舱船及货舱中部设一道横舱壁的两舱船,得出单舱船屈曲强度不足的结论,并提出改善屈曲强度的方案。

To evaluate the deformation, yield strength and buckling of the 3 600 DWT dry cargo ship, the direct calculation of hydrodynamic loadings was carried out to get the long-term prediction of the dominant load parameters in each load case, find out the parameters of the equivalent design waves, then predict the wave-induced hydrodynamic loads and ship motion of the glob- al ship. Based on the wave loading and inertia loads, the structural strength and stiffness of the global hull were direct assessed by FEM for two goal ships, one has just single hatch and another has a bulkhead in the mid-ship. The calculation results showed that single hatch cant meet the buckling criterion, so a scheme to enhance the buckling strength was given.