船首交叉单元压溃力的简化解析计算及应用修正

Simplified Calculation and Modification for Crushing Forces on Intersection Units of Bow Structure

现有的评估船舶在碰撞时压溃力的简化解析公式中,针对倾斜单元的强度缩减因子仅适用于含有小倾斜单元的球鼻结构。论文首先通过简化解析解和有限元准静态仿真的比较,验证了交叉单元简化解析公式对典型交叉结构的适用性。通过对船首的简化解析计算结果与准静态压载仿真结果的比较,发现当倾斜单元的倾斜角大于40°时,现有的倾斜角有效压溃距离与强度缩减因子已不再适用。为此,针对大倾斜角单元,基于几何折算的原理修正了有效压溃距离和强度缩减因子,并验证了其有效性。

In the simplified formulas used to assess the crushing force on a ship in collision, the inclination reduction factor is only useful for the bulb structure having elements with small inclined angles. In this paper, crushing force on the bulb of a 5000DWT bulk carrier is calculated with the simplified method and quasi-static simulation respectively, and the results are compared with each other. It is found that for the inclined angle of an element greater than 40 degrees, the existing effective crushing distance and reduction factor are no longer applicable. Thus, the effective crushing distance and reduction factor for the element having a large inclined angle are modified, and their effectiveness in application has been validated.