在结构力学的学习过程中，绘制弯矩图是基本功，属于重点考查内容，也是结构内力分析的起始性关键环节。超静定结构的弯矩图比较复杂，严重影响了学生对基本内容的理解和掌握。文章旨在通过对比静定对称刚架的弯矩图，分析反对称荷载作用下超静定对称刚架的弯矩图特点，从而找出对称刚架弯矩图的一般性规律。

In the process of learning structural mechanics, drawing bending moment diagram is the basic issue, which belongs to key examination part and starting point of the structural internal force analysis. The bending moment diagram of statically indeterminate structures is complicated, which seriously affects students' understanding and mastery of basic contents. This study aims to find out the general law about bending moment diagram of symmetrical rigid frame by comparing the bending moment diagram of stationary symmetric rigid frame and analyzing the characteristics of bending moment diagram of statically indeterminate symmetric rigid frame under anti-symmetrical load.

G642.0

陕西省"一流专业"建设项目（0012-310628170110）；陕西高等教育教学改革研究项目（17BZ018）