中性轴，指的是梁的中性层和横截面的交线。在平面弯曲和斜弯曲情形下，横截面与应力平面的交线上各点的正应力值均为零，这条交线称为中性轴。
当中性轴住于钢梁上翼缘时该方法能够给出计算简便且与试验值吻合较好的计算结果。
This method will avoid the problem that the result is too conservative when the neutral axis lies in the top flange of the steel member as the traditional method dose...
在界面的弹性变形区域的应力分布呈直线型，这种线性分布从截面中性轴开始到其屈服区域结束。
In the elastic region of the cross-section, the stress distribution varies linearly from the neutral axis to the beginning of the yielded area.
基本弹性弯曲理论要求弯曲应力均随到中性轴的距离而线性变化，但塑性弯曲理论揭示了一个更加精确的和复杂的应力分布。
Elementary Elastic bending theory requires that bending stress varies linearly with distance from the neutral axis, but plastic bending shows a more accurate and complex stress distribution.
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