中文摘要：

在板件不增设加劲肋的情况下增强板件的稳定性，提出了一种通过自身几何形状改变而增强稳定性的板件——自加劲板，在分析由这种板组成的箱形桥墩结构时将自加劲板等效为构造性正交异性板，从而简化了有限元模型的建立。基于卡氏第2定理并按轴向刚度等效和弯曲刚度等效的原则分别推导了等效于自加劲板的正交异性板的各弹性常数的计算公式，并通过算例进行验证。有限元静力分析结果表明对于处于压弯状态下的自加劲板和等效后的正交异性板的挠曲变形和正应力均相近，稳定性分析结果表明两板件抵抗失稳能力相近，因此采用文中所提计算弹性常数方法后的构造性正交异性板可以等效于自加劲板用于静力分析和稳定性分析。

英文摘要：

A kind of self-stiffened plate was designed to increase its stability without rib stiffener just by changing its own geometry. The self-stiffened plate was replaced by the equivalent orthotropic plate structurally to facilitate the finite element of self-stiffened plates. Based on the C modeling of the structure in the case of box shaped piers composed astigliano＇s second theorem and the equivalent principles of axial rigidity and flexural rigidity, the expressions of elastic constants, which are the parameter of equivalent orthotropic plates, were derived, and then verified by calculation respectively. The result of FE static analysis indicates that the deformations and normal stresses of the self-stiffened plate in the bending state were close with those of the equivalent orthotropic plate. The result of stability analysis indicates that the self-stiffened plate and the orthotropic plate are of the close critical buckling loads. In general, the orthotropic plate with the presented formula of elastic constants could replace the self-stiffened plate in the analysis of static and stability.