浅谈下承式系杆拱桥的设计

Simply Talking about Design of Tied Arch Bridge with Suspended Roadway

下承式系杆拱是一种无推力的拱式组合体系,是外部静定结构,兼有拱桥的较大跨越能力和简支梁桥对地基适应能力强的两大特点,当桥面高程受到限制而桥下又要求保证较大的净空(桥下净跨和净高)时,无推力的拱式组合体系桥梁是较优越的桥型。从设计方案选择、结构设计与施工等方面对沧黄高速跨线大桥进行了介绍。

Tied arch bridge with suspended roadway is an arch - typed combinatory system of zeroth thrust,which possesses both major features： with a statically determinate structure outside; having a strong capacity suitable for foundation owing to bigger spanning power of arch bridge and existence of simply - supported beam. As the elevation of deck is restricted and there＇e demands for larger clearance under bridge, the arch -typed bridge of zeroth thrust in combinatory hierarchy is a superior bridge type. The paper introduces the fly - over bridge on Cang-Huang Freeway from selection of design schemes, structure design and construction etc.