Abstract: Techno-economic analysis of conventional concrete arch bridge and continuous prestressed concrete rigid frame bridge is conducted. Then a new kind of rigid-frame arch bridge structure bestriding deep valleys or rivers in mountainous areas is proposed based on the advantages of the both above. The proper construction steps are suggested as follows ： half of the rigid-frame arch rib is constructed in pillar on two banks respectively at first, and then.two halves are rotated down vertically, closed up to form a whole arch rib. Its structural characteristics, construction technology and technical-economical benefits are analyzed. The rigid-frame arch structure has been successfully applied to Gulu Middle School Overpass Bridge over Yu-Lin highway. The past researches and engineering application have proved that the rigid-frame arch bridge is convenient, safe, efficient and field-saving in construction with excellent integration and ductility seismic performance. Its construction method can also be functioned as a valuable reference to the efficient non-bracket construction of large and medium span bridges.

Key words: rigid frame arch bridge , construction technology , structural performance , techno-economic analysis ;

摘要： 分析了常规混凝土拱桥和连续刚构桥的技术经济特点,在综合两种桥型技术经济优势的基础上,针对跨越山 区深谷河流的桥梁,提出一种新型的八字形刚构拱桥,其施工方法为:在两岸以立柱施工方式完成半刚构拱结构的 制作,再竖转合拢形成八字形刚构拱跨越结构。论述了该新型刚构拱桥的结构特点、施工工艺和技术经济效益,介 绍了该结构在渝邻高速公路古路中学立交桥的应用情况。已有研究和工程实践表明:刚构拱桥具有施工简便、安 全、迅速、节省场地、结构整体性和延性抗震能力好的特点,其施工方法为大、中跨径桥梁的无支架快速施工提供了 有价值的参考。

关键词: 刚构拱桥, 施工技术, 结构性能, 效益分析