铜陵公铁两用长江大桥梁端竖向转角控制设计研究

Controlling Methods Studies on Vertical Rotation Angle at Girder End for Tongling Rail-cum-road Changjiang River Bridge

大跨度桥梁梁端转角通常较大,对列车通过的安全性和舒适性有较大影响,应尽可能加以控制。对影响铜陵公铁两用斜拉桥梁端转角的各因素进行了对比分析,分析表明跨度布置尤其是锚跨跨度对梁端总体竖向转角影响最大。对不同的主梁梁端构造进行了研究,最终采用设置纵向加劲隔板的钢箱桥面结构形式,可有效减小梁端局部竖向转角。

The large span bridges usually have bigger vertical rotation angle at the beam end.The an-gel could affect the traffic safety and comfortability,so it should be minimized.The factors influen-cing the vertical rotation angle are analyzed for the Tongling rail-cum-road cable-stayed bridge;the re-sults show that the span arrangement especially the anchor span length is the most important factor. Different structure types of the railway deck were studied,and the box-shape deck structure with or-thotropic slab stiffened by longitudinal stiffener is adopted.Consequently the local vertical rotation angle caused by the deformation of the bridge deck could be controlled within an acceptable range.