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Steel and Composite Structures
  Volume 12, Number 3, March 2012 , pages 261-273

Experimental studies of circular composite bridge piersfor seismic loading
Sheng-Jin Chen, Kuo-Chen Yang, K.M. Lin and C.C. Wang

    This study proposes and examines a circular composite bridge pier for seismic resistance. The axial and flexural strengths of the proposed bridge pier are provided by the longitudinal reinforcing bars and the concrete, while the transverse reinforcements used in the conventional reinforced concrete pier are replaced by the steel tube. The shear strength of this composite pier relies on the steel tube and the concrete. This system is similar to the steel jacketing method which strengthens the existing reinforced concrete bridge piers. However, no transverse shear reinforcing bar is used in the proposed composite bridge pier. A series of experimental studies is conducted to investigate the seismic resistant characteristics of the proposed circular composite pier. The effects of the longitudinal reinforcing bars, the shear span-to-diameter ratio, and the thickness of the steel tube on the performance of strength, ductility, and energy dissipation of the proposed pier are discussed. The experimentalresults show that the strength of the proposed circular composite bridge pier can be predicted accurately by the similar method used in the reinforced concrete piers with minor modification. From these experimental studies, it is found that the proposed circular composite bridge pier not only simplifies the construction work greatly but also provides excellent ductility and energy dissipation capacity under seismic lateral force.
Key Words
    composite bridge pier; ductility; steel tube; seismic resistance
Sheng-Jin Chen, K.M. Lin and C.C. Wang : National Taiwan University of Science and Technology, Department of Construction Engineering,Taipei, Taiwan
Kuo-Chen Yang : National Kaohsiung First University of Science and Technology, Department of Construction Engineering,Kaohsiung, Taiwan

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