Techno Press
Techno Press

Steel and Composite Structures   Volume 20, Number 6, April30 2016, pages 1221-1236
Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings
Dongwook Kim, Chiho Jeon and Changsu Shim

Abstract     [Full Text]
    Modular structures consist of standardized modules and their connections. A modular bridge pier is proposed to accelerate bridge construction. Multiple concrete-filled steel tubes (CFTs) using commercial steel tubes were chosen as the main members. Buckling restrained bracings and enhanced connection details were designed to prevent premature low-cycle fatigue failure upon cyclic loading. The pier had a height of 7.95 m, widths of 2.5 m and 2.0 m along the strong and weak axis, respectively. Cyclic tests were performed on the modular pier to investigate structural performance. Test results showed that four CFT columns reached yielding without a premature failure of the bracing connections. The ultimate capacity of the modular pier was reasonably estimated based on the plastichinge- analysis concept. The modular CFT pier with enhanced bracing showed improved displacement ductility without premature failure at the welding joints.
Key Words
    modular bridge pier; CFT; buckling restrained bracing; cyclic test; ductility
Department of Civil Engineering, Chung Ang University, Seoul, Republic of Korea.

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