大跨度钢管混凝土拱桥拱座局部应力研究

Study of Local Stress in Arch Seat of Long Span Concrete-Filled Steel Tube Arch Bridge

拱座是将上部结构荷载传递到基础的重要传力构件,大跨度钢管混凝土拱桥的拱肋由钢管构成,荷载较普通钢筋混凝土拱桥集中,结构设计中对此一般从构造上考虑得比较多,理论计算上考虑得相对较少,有关文献也不多。结合某大跨度钢管混凝土拱桥,用ANSYS建立了其拱座空间计算模型,分析了各种荷载工况下的拱座应力,探讨了其应力分布情况。

The arch seat is an important element that transfers load from the superstructure to the foundation. For the long span concrete-filled steel tube （CFST） bridge, the arch ribs of the bridge are made up of steel tubes and the load thereof is more concentrated as compared to that of the common reinforced concrete arch bridge. In the structural design, the load is generally considered much in aspect of the structural formation, however it is considered relatively little in the theoretic calculation and the literatures in the relation to the load are not many. With reference to a long span CFST arch bridge, this paper establishes a spatial calculation model for the arch seat by means of ANSYS, analyzes the stress in the seat under different load cases and also conducts a study of the stress distribution therein.