计及残余应力和附连板屈曲后应力分布变化影响的船体板架加强筋侧向屈曲

Tripping of stiffened panel in ship structure with the effects of residual stress and variety of stress distribution in attached plate after its buckling

作为薄壁杆件,船体加筋板架中的加强筋在轴向压力的作用下可能发生绕定轴的侧向屈曲。本文采用了Faulkner残余应力模型和经验公式计算附连板屈曲以后应力分布的变化。在用能量法求解加筋板的侧向屈曲弹性临界应力时,在广义特征值方程中计及残余应力和附连板屈曲后应力分布变化的影响。

As thin-walled bars,stiffeners subjected to the axial pressure in ship panels may trip around their roots. This study modifies the energy approach developed for analyzing the tripping behavior. The Faulkner＇s model is adopted for the residual stress distribution. The change of stress distribution in attached plate after its buckling coincides with Faulkner＇s assumption and empirical formula. The effect of residual stress and variety of stress distribution in attached plate after its buckling is taken into account in the new eigenproblem formula.