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Steel and Composite Structures
  Volume 15, Number 3, September 2013 , pages 343-355

Seismic responses of composite bridge piers with CFT columns embedded inside
Wenliang Qiu, Meng Jiang, Shengshan Pan and Zhe Zhang

    Shear failure and core concrete crushing at plastic hinge region are the two main failure modes of bridge piers, which can make repair impossible and cause the collapse of bridge. To avoid the two types of failure of pier, a composite pier was proposed, which was formed by embedding high strength concrete filled steel tubular (CFT) column in reinforced concrete (RC) pier. Through cyclic loading tests, the seismic performances of the composite pier were studied. The experimental results show that the CFT column embedded in composite pier can increase the flexural strength, displacement ductility and energy dissipation capacity, and decrease the residual displacement after undergoing large deformation. The analytical analysis is performed to simulate the hysteretic behavior of the composite pier subjected to cyclic loading, and the numerical results agree well with the experimental results. Using the analytical model and history method, seismic responses of a continuous girder bridge using composite piers is investigated, and the results show that the bridge using composite piers can resist much stronger earthquake than the bridge using RC piers.
Key Words
    reinforced concrete; concrete filled steel tube; composite pier; seismic responses; cyclic loading tests; damage; ductility
(1) Wenliang Qiu, Shengshan Pan and Zhe Zhang: School of civil engineering, Dalian University of Technology, Dalian, P.R. China;
(2) Meng Jiang: School of hydraulic engineering, Dalian University of Technology, Dalian, P.R. China.

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