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轴力的正负号如何规定

更新时间: 2021-06-13 21:56:06     

1、轴向拉伸时轴力为正,轴向压缩时轴力为负。所以只需要判断力的方向即可。与杆件轴线相重合的内力,称为轴力,用符号FN表示。

2、当杆件受拉时,轴力为拉力,其指向背离截面;当杆件受压时,轴力为压力,其指向截面。通常规定:拉力用正号表示,压力用负号表示。

关键词: 负号 如何 规定

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