大跨度下承式钢管混凝土拱桥加固研究

The Reinforcement Research of Long Span Concrete Filled Steel Tube Arch Bridge

对一座大跨度钢管混凝土下承式拱桥进行了加固研究.通过加固拱桥的系杆,更换横梁,桥面板,加固拱脚,改善结构的刚度,提高拱桥的承载能力.模态分析表明,仅仅增加系梁的面积和刚度不能有效提高全桥的面内刚度,加固系杆对提高拱桥的稳定承载力意义不大,然而通过加固系杆可以提高桥面板的刚度,来增加桥梁整体的刚度和承载力,对于下承式拱桥拱肋强度足够的情况下,通过加固系杆、横梁、桥面板以提高拱桥整体的刚度和强度的加固方法是可行的.

In this paper, the reinforcement of a long span concrete filled steel tube arch bridge is studied by strengthening the tie bar, changing the beam and the bridge panel, reinforcing arch foot to improve the stiffness of the structure and the bearing capacity of arch bridge. Modal analysis shows that the increase of the bridge area and the tie beam stiffness can not effectively improve the stiffness of the whole bridge and that the reinforcement of tie bar can not improve the bearing capacity of the tied arch bridge. Thus we can reinforce the tie bar to im- prove the stiffness of bridge decks which in turn increases the whole bridge stiffness and bearing capacity. As for the arch ribse with hign intensity, it is feasible to improve the overall stiffness and bearing capacity of the bridge by strengthening the tie bar, beams, bridge deck.