The particle route method is produced for the shear force diagram drawing of multi-span beam based on the geometric principle of the force addition.
基于力的合成的几何法原理，提出了绘制多跨梁剪力图的质点路线法。
This method may be used as a solution for a multi-span beam with variable cross section under conditions of various kinds of loads, supports and junctions.
此法可用于求解在各种载荷、支承及联接条件下的变截面多跨梁。
This method can not only be used to draw shear force diagram quickly, but also to determine the shear sign automatically, and to verify the reaction force of multi-span beam.
该方法不但能快速绘制剪力图，而且自动确定剪力符号，兼可对多跨梁的支座反力进行校核。
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