一种大跨径“人字形”三角钢桁架桥的设计与计算

Design and Calculation of a Long-span "Herringbone" Triangular Steel Truss Bridge

随着我国城市桥梁建设的快速发展,人们对桥梁的景观造型要求越来越高。钢桥因为架设速度快,造型美观多样,常常会成为城市当中一道亮丽的风景线,在城市桥型中很有竞争力。对于城市桥梁建设中T字形路口、上岛道路的建设条件,常规钢梁桥难以适用于此情况,需要采用分岔的异形结构。结合具有此建设条件的实际工程——司马坡大桥,提出了一种大跨径“人字形”三角形钢桁架桥即一种平面造型呈Y字形分肢、立面造型呈三角形的半穿式钢桁梁桥的设计方案;并对此桥进行了静力计算、屈曲及动力特性分析。相关成果可为桥梁设计人员提供参考。

With the rapid development of urban bridge construction in China, the people have the higher and higher requirements on the landscape modeling of bridge. The steel bridge often becomes a bright landscape of a city because of its fast erection speed and diverse attractive appearances, and is very competitive in the urban bridges. The conventional steel beam bridges are not suitable for this situation of the T-shaped intersection and island road in the construction of urban bridge. The fork-shaped irregular structure is required to use. Combined with a practical project - Simapo Bridge with this construction condition, this paper puts forward a design scheme of long-span "herringbone" triangular steel truss bridge - a plane modeling of Y-shaped limbs and vertical modeling of triangular semi-through steel truss bridge, and carries out the static calculation, and the buckling and dynamic characteristic analysis of this bridge. The relative results can be referred for the bridge designers.