关键词: 刚构拱桥, 施工技术, 结构性能, 效益分析

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 ;