对分析剪心的一点讨论

• 作 者: 方汝瑢
• 机 构: 北京航空学院
• 出 处: 力学与实践
• 发表日期: 1986年02期
• 关键词: 角形 形心 力学教材 槽形 中心线 作用线 横向力 理论力学 力系 分析方法

国内外有些材料力学教材在讨论开口薄壁截面剪心吋,如对角形截面(图1a)分析的结论是:两矩形上的弯曲剪应力构成的合力必通过两矩形中线的交点,此点即是角形截面的剪心。又对等翼缘的z型截面(图1b),两个力F_1具有通过形心并平行于翼缘的合力2F_1,此合力与F_2相交于形心处,因此,该点为截面的剪心。

Some materials mechanics textbooks at home and abroad are discussing open-section thin-walled section shear cores, such as the diagonal section (Figure 1a) analysis concluded that: the resultant force formed by the bending shear stress on the two rectangles must pass the intersection of the two rectangular midline, this point It is a corner section of the heart. In the z-section of the equivalent flange (Fig. 1b), the two forces F_1 have a resultant force 2F_1 that passes through the centroid and is parallel to the flange. This resultant force intersects with F_2 at the centroid. Therefore, the point is the shear center of the section. .