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 ofthe skew bridge with an orthogonal deek.It is an extension of the method prev-iously developed by the author for the straight bridge in which the main girdersare considered as a statically indeterminate structural system with continuous con-nections along the flanges.The result shows that in the analysis of the loaddistribution the skew bridge with an atthogonal deck can be treated as a corresp-onding straight bridge by simply magnifying the bending and torsional stiffnessesof the girders according to the skew angle of the bridge and the magnitude of thestiffnesses.The skew bridge having a skew angle α≥60°can be considered as astraight bridge with respect to the load distribution factor m_c.