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在25.5m车体钢结构各方案整体计算的基础上,对枕梁和与其相连接的下边梁部分进行了二次细算。计算结果表明,在40t垂直载荷和120t纵向压缩载荷组合作用下,腹板内侧距为320mm、上下盖板宽600mm,厚分别为8mm、10mm的箱形断面的枕梁,应力均未超出许用应力。但枕内侧下边梁下翼缘的应力很大,局部已达屈服极限。为消除枕梁和下边梁连接结点的局部影响,缓和、疏导受力严重区域的应力,提出了三种连结方案。经计算比较,在枕梁下盖板和边梁下翼缘间焊一斜边呈弧状的直角三角板,边梁腹板和枕梁腹板间焊—斜立板的方案较其它两个方案更有效。使原来受力严重处的应力位下降至98MPa。
Based on the overall calculation of each plan of 25.5m vehicle body steel structure, the second calculation is made for the part of the bolster and the side sill connected with it. The calculated results show that under the combination of 40t vertical load and 120t longitudinal compressive load, the internal distance of web is 320mm, the width of upper and lower covers is 600mm, the thickness of 8mm and 10mm are not exceeded stress. However, under the lower edge of the pillow under the flange of the stress is large, the local has reached the yield limit. In order to eliminate the local influence of the connecting points between the bolster and the side sill, and to relieve and relieve the stress in the stressed area, three connection schemes are proposed. After calculation and comparison, a right-angled triangle plate with a bevelled edge is welded between the under-bolster and the lower flange of the side-beam. The solution of the side-beam web and the bolster web is more inclined than the other two schemes effective. So that the original stress at the Department of stress down to 98MPa.