中卫南站黄河大桥异形钢-混组合拱桥设计

中卫南站黄河大桥在中卫南站上游跨越黄河干流,是连接中卫沙坡头机场和高铁中卫南站的重要交通节点。主桥采用三跨连续异形钢-混组合拱桥,跨径布置(100+130+40)m,一侧主墩处为拱、梁、墩固结的V腿刚构,另一侧主墩处为设支座的连续梁体系。上部结构为拱、梁共同受力的组合体系,钢箱拱肋、钢箱梁分别与混凝土墩顶段设置钢-混凝土结合段,且主跨拱肋采用U形回转式的异形造型,总体结构体系及细部构造均极其复杂。经过分析,该桥强度、刚度、稳定性均满足规范要求,可为类似工程的设计和施工提供参考。

Design of Special-shaped Steel-concrete Composite Arch Bridge of Yellow River Bridge of Zhongwei South Station

The Yellow River Bridge of Zhongwei South Station crosses the main stream of the Yellow River at the upstream of Zhongwei South Station,and is an important traffic node connecting Shapotou Airport and Zhongwei South Station of high-speed railway.The main bridge is a three-span continuous special-shaped steel-concrete composite arch bridge.Its span layout is 100 m+130 m+40 m.The V-leg rigid frame consolidated by arch,beam and pier is at one side of main pier,and the continuous beam system with support is at the other side of main pier.The superstructure is a composite system of arch and beam.The steel box arch rib and steel box beam are respectively set with steel-concrete composite section at the concrete pier top section.And the main span arch rib adopts the U-shaped rotary special shape.The overall structure system and details are extremely complex.After analysis,the strength,rigidity and stability of this bridge all meet the standard requirements.The reference can be provided for the design and construction of the similar projects.