圆柱壳仅受轴向均匀外压的总稳定性分析

环肋圆柱壳存在异常特性。在异常特性区间内,其总失稳临界压力取决于仅受轴向均匀外压环肋圆柱壳的失稳临界压力。通过理论计算,揭示了环肋圆柱壳仅受轴向均于外压的失稳性质与光圆柱壳几乎一致。纵横加筋圆柱壳仅受轴向均匀外压下的失稳临界压力随肋骨尺寸或纵骨尺寸的增加而增大,随舱室长度的减小呈现先增大后减小再增大的反复递增规律。提高环肋圆柱壳在异常特性区间的失稳临界压力的有效方法是增设纵骨。

Analyze on overall stability of cylindrical shell which are under only axial uniform external pressue

It is known that there is abnormal characteristics for ring-stiffened cylindrical shell. At the abnormal interval, the overall losing stability critical pressure is decided by the ring-stiffened cylindrical shells which are under only axial uniform pressure .Theoretical calculation presents that stability characteristics of the ring-stiffened cylindrical shell which is under axial uniform pressure are the same as unstiffened cylindrical shell .The losing stability critical pressure of longitudinal and transverse cylindrical shell which is under axial uniform pressure increases with enlarging ring size or longitudinal size, and as the length of compart decreases ,the pressure becomes large, then becomes small, after then becomes large, progressively increasing again and again. It is recommended that we should design longitudinals for ring-stiffened cylindrical shell which is in abnormal characteristics interval in order to improve its overall losing stability critical pressure.