纵横加肋圆柱壳稳定特性

Research on stability of characteristic of longitudinal and transverse stiffened cylindrical shells

在一定条件下,环肋圆柱壳稳定性存在异常特性区间,即减小舱长或增大横向肋骨尺寸,环肋圆柱壳总稳定性理论临界压力不变。在这两类异常特性区间内,可以通过加设纵骨的方式来提高圆柱壳结构的总稳定理论临界压力。当相对厚度减小时,纵骨在提高总稳定临界压力方面的作用更加明显。纵横加肋圆柱壳横向刚度不足时,其稳定性也存在异常特性区间,即增大纵骨尺寸,总稳定理论临界压力保持不变。

On certain conditions, there are two categories of abnormal characteristic intervals general stability for ring-stiffened cylindrical shells. In those intervals, ring-stiffened cylindrical shells general stability theoretic critical pressure doesn＇t rise by decreasing shell length or increasing ring ribs size, but the critical pressure value rises when longitudinal ribs are added to the shells. Longitudinal ribs＇ function on rising general stability critical pressure will be more obvious if the relative thickness decreases. There is also another category abnormal characteristic interval for the longitudinal and transverse stiffened cylindrical shells whose transverse stiffness is not sufficient. In other words, general stability theoretic pressure retains the same even increasing the size of longitudinal ribs.