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本文用有限元法分析研究了设有竖向加劲肋的钢板梁开孔腹板的弹性屈曲。主要研究了翼缘和加劲肋截面尺寸保持不变的情况,但对其刚度的减小所产生的影响也作了适当分析。文中可变参数为板块的高宽比及板块中央开孔的形状和大小。所采用的模型允许腹板具有自然边界条件。计算结果表明,由翼缘和加劲肋所嵌固的腹板板块的屈曲强度,可按假定为四边固定的板进行计算,从而为计算开孔腹板的弹性临界应力提供了一个简单的公式。该公式与计算实腹板(即无孔腹板——泽注)的弹性临界应力的公式相似,“它适用于中央开圆孔、方孔及长圆孔的情况。
In this paper, the finite element method was used to analyze the elastic buckling of the open web of steel beam with vertical stiffeners. The main study of the flange and stiffener cross-sectional dimensions remain unchanged, but the impact of reduced stiffness also made a proper analysis. Text variable parameters for the plate aspect ratio and the shape and size of the central opening of the plate. The model used allows the web to have natural boundary conditions. The calculation results show that the buckling strength of the web plate embedded by the flange and the stiffener can be calculated on the assumption of a four-sided fixed plate, thus providing a simple formula for calculating the elastic critical stress of the open web. This formula is similar to the formula for calculating the elastic critical stress of a real web (that is, a non-perforated web-tab). "It applies to the case of a central open hole, a square hole and an oblong hole.