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讀了《鉄路标准設計通訊》1965年第5期邹守簡同志的“关于鋼桁梁平联与弦杆共同受力問題”一文后,也談談个人对这个問題的浅見。专业設計院出版的《桥規学习記录汇編》对这个問題的解释的确不够清楚。但是邹守簡同志推导的結論也似有問題。对这个問題,我是这样理解: 以交叉形上平联为例(見图1),弦杆受力为S_n,由于上弦杆的压縮变形,使斜杆产生內力S_d(压力)。这个斜杆內力阻碍弦杆变形,使弦杆产生附加內力△S_n=-Sd~(cosα);支杆产生內力S_p=2 S_dsinα(拉力)。支杆前面有系数2,是因为只繪出一个节間,事实上
After reading the article on Common Problems of Parallel Joints and Chords of Steel Truss Girders published by Zou Shoujian, No. 5, 1965, No. 5 of 1965, I also talked about my personal opinions on this issue. Professional Design Institute published Bridge Compilation of learning records on the interpretation of this issue is not clear enough. However, the conclusions drawn by Comrade Zou Shoujian also seem to have problems. To this problem, I understand this way. Taking the cross-shaped parallel connection as an example (see Figure 1), the chord force is S_n, which causes the inclined rod to generate internal force S_d (pressure) due to the compression deformation of the winding rod. The internal force of the diagonal rod hinders the deformation of the chord so that the chord generates additional internal force ΔS_n = -Sd ~ (cosα); the internal force of the strut generates S_p = 2 S_dsinα (tensile force). There is a factor of 2 in front of the strut because only one internode is drawn, in fact