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为了便于计算机对于农业工程中阶梯梁（轴）进行分析计算，本文首先根据阶梯悬臂梁挠曲线的曲率，与假定直径为ｃ的等截面梁的挠曲线的曲率完全相同的条件，对阶梯悬臂梁进行等效变换，从而达到用等截面梁代替阶梯梁的目的。其次利用简支梁挠度，相对挠度及支座截面转角的关系，推导并建立阶梯连续梁的三弯矩等效方程及其挠曲线等效方程。利用上述方程，具有分析程序化、计算公式化的特点，方程可靠实用。
In order to facilitate computer analysis and calculation of the ladder beam (shaft) in agricultural engineering, according to the curvature of the deflection curve of the ladder cantilever beam and the curvature of the bending curve of the equal-section beam assuming the diameter c, The beam is equivalently transformed so as to achieve the purpose of replacing the ladder beam with a section beam. Secondly, based on the relationship between the deflection, the relative deflection and the angle of the section of the support beam, the equivalent equation of the three moment and the equivalent equation of the deflection curve of the stepped continuous beam are deduced and established. Using the above equation, it has the characteristics of analyzing program and formulating formula, and the equation is reliable and practical.