加筋板结构的大变形

Large Deflection of Stiffened Plates

本文对受均布载荷，具有一根纵向加筋多根横向加筋的加筋板结构的残余变形导出了近似理论分析方法。从假设变形模态出发，依据极限分析原理获得可能变形模态和模态判别条件。在变形分析中，计及膜力（轴力）影响，但忽略弹性影响，得到了各变形模态下的残余变形估算公式。最后根据本文的理论分析方法和ＡＤＩＮＡ程序作了实例计算。

s An approximate, theoretical analysis in order to estimate the permanent deflection is presented herein for a uniformly loaded, stiffened plates with one stiffener in the longitudinal direction and many stiffeners in the transverse. Possible deflection modes are obtained by the principle of limit analysis and the discriminating conditions of the deflection mode are established. The estimated formulars for the permanent transverse deformation are given from deflection mode and from internal energy dissipation of the plastic hinge lines, but the influence of membrane forces is considered and the influence of the elastic is neglected in the analysis. Examples are calculated by the theoretical analysis herein and ADINA. It is observed that reasonable agreement between the theoretical predictions and ADINA results has been obtained for the deflection mode and the maximum permanent transverse deformation.