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Smart Structures and Systems Volume 17, Number 4, March 2016 , pages 541-557 DOI: https://doi.org/10.12989/sss.2016.17.4.541 |
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Seismic performance of prefabricated bridge columns with combination of continuous mild reinforcements and partially unbonded tendons |
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Koem Chandara, Shim Chang-Su and Park Sung-Jun
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| Abstract | ||
| Prefabricated bridge substructures provide new possibility for designers in terms of efficiency of creativity, fast construction, geometry control and cost. Even though prefabricated bridge columns are widely adopted as a substructure system in the bridge construction project recently, lack of deeper understanding of the seismic behavior of prefabricated bridge substructures cause much concern on their performance in high seismic zones. In this paper, experimental research works are presented to verify enhanced design concepts of prefabricated bridge piers. Integration of precast segments was done with continuity of axial prestressing tendons and mild reinforcing bars throughout the construction joints. Cyclic tests were conducted to investigate the effects of the design parameters on seismic performance. An analytical method for moment-curvature analysis of prefabricated bridge columns is conducted in this study. The method is validated through comparison with experimental results and the fiber model analysis. A parametric study is conducted to observe the seismic behavior of prefabricated bridge columns using the analytical study based on strain compatibility method. The effects of continuity of axial steel and tendon, and initial prestressing level on the load-displacement response characteristics, i.e., the strain of axial mild steels and posttensioned tendon at fracture and concrete crushing strain at the extreme compression fiber are investigated. The analytical study shows the layout of axial mild steels and posttensioned tendons in this experiment is the optimized arrangement for seismic performance. | ||
| Key Words | ||
| prefabricated bridge pier; partially unbonded tendon; nonlinear analysis; seismic performance | ||
| Address | ||
| Koem Chandara, Shim Chang-Su and Park Sung-Jun: Department of Civil Engineering, Chung-Ang University, Seoul 156-756, Korea | ||