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Steel and Composite Structures Volume 20, Number 6, April30 2016 , pages 1221-1236 DOI: https://doi.org/10.12989/scs.2016.20.6.1221 |
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Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings |
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Dongwook Kim, Chiho Jeon and Changsu Shim
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| Abstract | ||
| 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 | ||
| Address | ||
| Department of Civil Engineering, Chung Ang University, Seoul, Republic of Korea. | ||