Techno Press
Techno Press

Steel and Composite Structures   Volume 20, Number 6, April30 2016, pages 1193-1203
Analytical evaluation of a modular CFT bridge pier according to directivity
Dongwook Kim, Chiho Jeon and Changsu Shim

Abstract     [Full Text]
    This paper focuses on the analytical behavior of modular circular concrete-filled tubular (CFT) column with enhanced bracing details. To design a full-scale bridge pier of multiple circular concrete-filled tubes, numerical analysis was used to evaluate structural performance according to load directivity. In previous research (Ma et al. 2012, Shim et al. 2014), low cycle fatigue failure at bracing joints was observed, so enhanced bracing details to prevent premature failure are proposed in this analysis. The main purpose of this research is to investigate seismic performance for the diagonal direction load without premature failure at the joints when the structure reaches the ultimate load. The ABAQUS finite-element software is used to evaluate experimental performance. A quasi-static loading condition on a modular bridge pier is introduced to investigate structural performance. The results obtained from the analysis are evaluated by comparing with load.displacement responses from experiments. The concretefilled tubes with enhanced bracing details showed higher energy dissipation capacity and proper performance without connection failure for a diagonal load.
Key Words
    modular bridge pier; CFT; non-linear analysis; quasi static; bracing
Department of Civil Engineering, Chung Ang University, Seoul, Republic of Korea.

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