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从身管的实际形态出发，分析讨论了自紧身管受端部效应影响时，阶梯圆柱段主测试截面的选取原则。其结果与圣维南原理定量判断相当。
Based on the actual shape of the barrel, the principle of selection of the main test cross section of the stepped cylindrical section is analyzed and discussed when the bolster is affected by the end effect. The result is comparable with Saint-Venant’s principle.