C型独立双体罐中纵舱壁的强度研究

Study on Strength of Center Longitudinal Bulkhead in Independent Type C Bi-lobe Tank

液化气船的C型独立双体罐内设有中纵舱壁,它与常规应用于C型舱的回转体结构相比表现出一些特殊的力学特性。对中纵舱壁的受力机制进行了分析,提出了纵舱壁结构在一般装载工况条件下的应力计算方法,并采用有限元模型直接计算方法作了进一步研究,同时对所提出的公式方法的适用性进行了验证。另外,还对中纵舱壁在不利装载工况下的强度进行了初步的探讨。

There is a center longitudinal bulkhead in the independent type C bi-lobe tank of liquefied gas carriers,and the bulkhead has some special mechanical characteristic compared with cylindrical structure which is commonly used in type C tanks.The mechanical function of the center bulkhead is analyzed,and a formula method is proposed to calculate the stress of bulkhead under general loading conditions.Then a further study for the bulkhead is made through finite element analysis method,and the feasibility of formula method is verified.In addition,the strength of the center longitudinal bulkhead under adverse condition is discussed preliminarily.