纵向受压板架加强筋扭转屈曲临界应力公式

Equation for Predicting Tripping Stress of Stiffeners in Stiffened Panels

船体加筋板架结构中通常采用的角钢、T型钢之类开口断面型材加强筋由于扭转刚度较小 ,纵向受压后往往首先发生扭转屈曲 .鉴于目前船级社规范给出的加强筋扭转屈曲临界应力计算公式未能反映侧向压力以及板屈曲模式对加强筋扭转屈曲临界应力的影响 ,导出了一个计及上述两个影响因素的加强筋扭转屈曲临界应力计算公式 。

Stiffeners with thin walled open cross sections, such as T, angle cross sections, are widely employed in stiffened panels of ship hull structures. Due to the low torsional rigidity of the thin walled open cross section, tripping is likely taken place first when the stiffeners are subjected to axial compression. In the equations given by the current main classification societies rules, the effects of lateral pressure and plate buckling mode to the tripping stress are not taken into account. A new equation for predicting tripping stress of stiffeners with these two effects was derived in this paper, which can be used in design rules to check the tripping strength of stiffeners.