钢板梁面内极限荷载的简化计算方法

根据板梁在腹板平面内荷载作用下的工作，拟定板梁弯曲、剪切位移及腹板面外翘曲函数，考虑几何非线性、腹板初始曲度及横向加劲肋的面外弯曲刚度，由势能驻值原理建立板粱的平衡方程。本文提出了消除内外剪力不平衡的方法，用修正的Ｎｅｗｔｏｎ—Ｒａｐｈｓｏｎ法及增量荷载迭代求解。文中计算了两片试验梁的荷载─—挠度曲线及极限荷载，与实测结果接近。

Simplified Method for Ultimate Load in the Web Plane of Plate Girder

Based on works of the plate girder in its web plane,the displacement function of bend and shear and its out warp are assumed. With the consideration of the genetrical nonlinear, the initial imperfection of the web and out stiffness of the lateral stiffener, the balanced equation of the plate girder is set up by using the potential energy variation principle.The method of eliminating non -equilibrim force between the inner and outer shear force is given. By using the modified Newton-Raphson interative method,the deflection curve and ultimate load-are obtained.The experimental results of tested plate girder agree with those of calculation.