海外项目中小跨径桥梁上部结构型式方案浅析

Analysis on the Type Scheme of the Upper Structure of Small and Medium Span Bridges in Overseas Projects

文章针对柬埔寨的公路桥梁建设项目,对中小跨径桥梁上部结构的选型方案进行分析,从造价、施工便宜性、运营期病害等角度,对空心板梁、矮T梁及小箱梁方案进行了阐述。空心板梁铰缝处是受力薄弱点,病害易发生,但是施工方便,造价经济,超载不严重情况下较适用;矮T梁病害较少,结构优良,做为一种新型的桥梁结构必将得到广泛应用;小箱梁是一种传统桥型,跨越能力突出,施工简洁,仍然是一种很好的桥梁结构。依照当地国情,选取适当的设计荷载,采用恰当的桥梁结构,是值得桥梁设计者深思的重要课题。

This paper analyzes the selection plan of the upper structure of medium and small span bridges for highway bridge construction projects in Cambodia.From the perspectives of cost,construction cheapness,and disease during operation period,hollow slab beam,short T beam and small box girder program was elaborated.The hollow joint of the hollow slab beam is weak,and the disease is easy to occur,but the construction is convenient,the cost is economical,and the overload is not serious.The short T-beam has fewer diseases and good structure,and it is a new type of bridge structure.It will be widely used;the small box girder is a traditional bridge type with outstanding spanning ability and simple construction,and it is still a good bridge structure.According to the local conditions,choosing the appropriate design load and adopting the appropriate bridge structure are important topics that bridge designers should ponder.