第3章 静定结构的受力分析 三、内力图 （internal force diagram） 1. 内力方程（equation of internal force）：截面法，静力平衡条件。
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To learn engineering mechanics and do engineering computation, we must master the drawing methods of internal force diagram.
要学好工程力学，进行工程计算，必须掌握好内力作图方法。
In mechanical project calculation, drawing internal force diagram is very important. With respect to complex internal force diagram, this paper presents some simplification methods of drawing.
在进行机械工程计算时，作构件的内力图是非常重要和不可缺少的环节。本文针对较繁锁的内力图，就画法的简化进行了探讨。
By theoretical analysis, the considerations were put forward about the check with symmetry solving hyperstatic structure, avoiding internal force diagram check errors caused by inertial thinking.
通过理论分析，提出利用对称性求解超静定结构时应注意的问题，避免因惯性思维造成最后内力图校核出现错。
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