基于集中力的船体强度直接计算加载方案

On Loading Scheme Based on Concentrated Force for the Hull Strength Direct Calculation

针对在已知弯矩分布时直接计算船体总纵强度的问题,结合船舶结构力学分析方法,根据已知弯矩分布反算得到作用在船体上的等效外力,利用ANSYS建立变截面空心薄壁梁理论模型,将等效外力以集中力形式加载到模型相应剖面,验证外力计算的有效性,同时利用实船整船有限元模型,选择不同的约束支点以及不同的加载方案,采用集中力加载计算船体总纵强度,提取计算后模型中节点力系构成的剪力和弯矩,与已知剪力、弯矩分布进行对比,结果表明,集中力法可用于船体总纵强度直接计算,且计算结果与已知的剪力、弯矩分布吻合较好。

For the assessment of hull structure＇s longitudinal strength based on given bending moment in the direct strength analysis,combining with the ship structural mechanics method,the equivalent external force acting on hull was gotten according to the bending moment distribution. A hollow thin-walled beam model was established in ANSYS,loading the equivalent external force in form of concentrated forces to the proper sections of the model,the availability of external force calculation was verified.The global FEM of a real ship was used to calculate the hull structure＇s longitudinal strength based on proposed method. The numerical results were analyzed to extract the shearing force and bending moment. The results showed that the concentrated force method is available in direct calculation of hull＇s longitudinal strength,and the resultant shearing force and bending moment distribution can match the given ones well.