正交结构的斜梁桥的荷载横向分布分析

Load Distribution of the Skew Bridge with an orthogonal Deck

斜梁式桥,由于构造、施工的原因,常采用桥面板和横梁与主梁正交的结构。作者对这种结构的正桥,以主梁为单元(基本体系)按超静定结构力学原理,建立了荷载横向分布的实用计算。本文试图将这个方法引伸用于斜桥。分析表明,斜桥可以近似地通过增大主梁刚度当作正桥处理。

An approximate method is presented for the analysis of the load distribution of the skew bridge with an orthogonal deck. It is an extension of the method previously developed by the author for the straight bridge in which the main girders are considered as a statically indeterminate structural system with continuous connections along the flanges. The result shows that in the analysis of the load distribution the skew bridge with an arthogonal deck can be treated as a corresponding straight bridge by simply magnifying the bending and torsional stiffnesses of the girders according to the skew angle of the bridge and the magnitude of the stiffnesses. The skew bridge having a skew angle α≥60°can be considered as a straight bridge with respect to the load distribution factor m_c.