曲弦连续钢桁架有轨电车桥梁设计

Design of Bridge with Curved Chord Continuous Steel Truss for Tramway

摘要:

桥梁工程2-1桥为有轨电车专用桥，桥面通行双线有轨电车，接连园区多个古典欧式风格小镇，并兼顾汽车及行人通行需求。桥梁跨径布置为（50+110+50） m，为三跨变高度曲弦连续钢桁桥。桁架的上、下弦杆设计成反向多次曲线，桥梁外形整体呈现出仿链型悬索的仿古造型。桁架上、下弦杆采用焊接π字型截面，局部通过高强螺栓连接外贴板进行加厚。桁架节点板处综合采用了栓、焊、铆相结合的连接方式，其中铆钉均设置在桁架可视面，以突出古典欧式风格。深化设计采用调整钢桁架系统线的方法设置桥梁预拱度，减小了现场调整工作量。结构有限元计算结果表明，桥梁结构受力计算各项指标满足规范要求。

Abstract:

Bridge Engineering 2-1 Bridge is a tramway bridge, and the bridge deck is open to double-track trams, which connects to a number of classical European style towns in the park, and takes into account the needs of cars and pedestrians. The span arrangement of the bridge is (50+110+50) m, and it is a three-span variable-height curved chord continuous steel truss bridge. The upper and lower chord rods of the truss are designed to reverse multiple curves, and the overall shape of the bridge presents an antique shape of the imitation chain suspension cable. The upper and lower chord rods of the truss are welded in π-shaped sections and partially thickened by connecting the outer plate with high-strength bolts. The joint plate of the truss is connected by a combination of bolt, welding and rivet, in which the rivets are set on the visible surface of the truss to highlight the classical European style. In the deepening design, the method of adjusting the steel truss system line is adopted to set up the bridge camber, which reduces the field adjustment workload. The results of structural finite element calculation show that each index of structural stress calculation of the bridge meets the specification requirements.