This paper illustrates the analytical method of predicting the yield capacity of steel I-section subjected to axial and biaxial bending loads. The analytical method precludes the use of the standard flexure and the interaction formula for biaxial bending. The steel stress diagram is applied to the I-section from which forces and bending moments are calculated. These values are then plotted to yield the capacity curve of the steel I-section. Variables considered are the width b and depth d of the rectangular tubing, thickness of the shell, steel yield stress f_y and position of the capacity axis. The diagonal of the outer rectangle enclosing the I-section is chosen for generating the capacity curve. Microsoft Excel worksheet is used to plot the yield capacity curve of any steel I-section. An example yield capacity curve for a steel I-section is shown as proof that the analytical method is feasible.
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机译：本文阐述了一种预测轴向和双轴弯曲载荷下钢I型截面屈服能力的分析方法。该分析方法排除了使用标准挠度和双轴弯曲的相互作用公式。将钢应力图应用于I型截面，从中计算出力和弯矩。然后绘制这些值以得出钢I型截面的容量曲线。所考虑的变量包括矩形管的宽度b和深度d，壳体的厚度，钢屈服应力f_y和容量轴的位置。选择包围I型截面的外部矩形的对角线以生成容量曲线。 Microsoft Excel工作表用于绘制任何钢I型截面的屈服能力曲线。举例说明了钢I型截面的屈服能力曲线，以证明该分析方法是可行的。
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