摘要
一个平面汇交力系的平衡条件是其力多边形必须闭合,依其条件,利用图解法和计算机中的AUTOCAD绘图工具,迅速准确地求解一个结点上的两个未知力,并以其类推求解桁架各杆内力.
The balance condition of a planar crossing force system is the closing of its forcepolygon. According to the condition, the two unknown forces on a panel joint can beobtained rapidly and accurately by means of the graphic method and the AUTOCAD drawingtool in a computer, and so can the internal force of every bar of truss.
