城市高架桥斜交跨河设计研究

Design and Study on Oblique River Crossing of Urban Viaduct

摘要:

城市高架桥是城市立体交通网络的重要组成部分，具有提高路网交通效率和融合新老城区、城乡区域等优点，在新型城镇化发展过程中发挥着重要作用。鉴于高架桥的桥型需服从总体线路的走向，在跨越河流或地面道路等桥下构造物时，其桥墩往往需斜交并在两侧引桥转正交接顺。以广州市某高架桥为例，对此类跨河桥型进行了结构选型优选，介绍了斜交转正交变高连续箱梁的构造点及不同腹板预应力钢束异性化布置方案，并对该类型斜交桥的梁格和下部抗震计算问题进行了探讨，从而为同类桥梁设计提供一些参考方法和思路。

Abstract:

The urban viaduct is an important part of the urban three-dimensional traffic network, has the advantages of improving the traffic efficiency of the road network and integrating the new and old urban areas, urban and rural areas, etc., and plays an important role in the development of new urbanization. In view of its bridge type required to follow the direction of the overall line, when crossing the river or ground roads and other structures under the bridge, the piers need to be crossed obliquely and the approach bridge on both sides should turn to the orthogonal direction. Taking a viaduct in Guangzhou as an example, the structural type of this type of river crossing bridge is optimized. The structural points of the oblique crossing to normal crossing heightening continuous box girder and the heterogeneity of the layout of prestressed tendons in different webs are introduced, and the seismic calculation of the beam grillage and lower part of this type of oblique bridge are discussed so as to provide some reference methods and ideas for the design of similar bridges.