拱形钢桥主桁内力成分及计算方法

Internal Force Element for Girder of Arch Steel Bridge and Calculation Method

对抛物线拱形钢桥主桁按平面计算图式和空间计算图式作对比计算分析，结果表明，拱形钢桥主桁内力应按空间结构计算；主桁各类杆件轴力存在较大的不均匀性；杆件在平面内外的弯曲正应力对正应力计算结果有较大影响。

The girder of parabolic arch steel bridge was compared and analyzed by the methods of plane and space calculating charts. The results showed that the internal force for girder of arch steel bridge should be calculated according to space structure; a large non--uniformity exists in the axial force of all kinds of member; the bending positive stress of member in and out the plane has great effect on the calculating results of positive stress.