Introduction
摘要
A concrete-filled steel tubular (CFST) arch bridge refers to an arch bridge with a CFST arch or a truss arch with CFST chords. The web member of the truss arch can be section steel or steel tube with or without in-filled concrete. Longitudinally-welded rolled steel tubes with strength grades of Q235, Q345, and Q390 specified by Chinese standard for design of steel structures are generally adopted for the steel tubes (Ministry of Housing and Urban–Rural Development of the People’s Republic of China, Inspection and Quarantine of the People’s Republic of China. Standard for Design of Steel Structures: GB50017-2017. China Architecture & Building Press, Beijing, 2017 (in Chinese)), and the in-tube concrete generally utilizes concrete with strength grades of C40 ~ C80 specified by Chinese code for highway reinforced concrete and prestressed concrete bridges and culverts (Ministry of Transport of the People’s Republic of China, in Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts: JTG 3362–2018. China Communication Press, Beijing, 2018 (in Chinese)).