Large-Scale Experimental Study of Precast Segmental Unbonded Posttensioned Concrete Bridge Columns for Seismic Regions
Publication: Journal of Structural Engineering
Volume 136, Issue 3
Abstract
The seismic behavior of the proposed precast segmental unbonded posttensioned concrete bridge columns for use in regions of high seismicity was investigated experimentally. Posttensioning tendons were placed in the hollow core of the columns and left unbonded with the surrounding concrete to decrease prestress loss during earthquakes. Bonded mild steel bars continuous across the segment joints, also referred to as energy dissipation (ED) bars, were used to enhance the seismic resistance of the columns. The bars were unbonded at the critical joint to avoid premature low cycle fatigue failure. The objectives of this study were to (1) verify the proposed construction method and seismic detailing for the ED bars and (2) investigate the seismic behavior of the columns with different ED bar ratios and posttensioning forces. Four large-scale specimens were designed and tested with lateral cyclic loading. Test results showed that the proposed construction method and seismic detailing for the ED bars were effective in ensuring the ductility and ED capability of the bars. The specimens exhibited excellent drift capacities that are adequate for use in regions of high seismicity. The hysteretic ED capacity and residual drift of the column increased as the ED bar contribution to the expected column strength increased. To maintain self-centering capability, of more than 35% is not recommended.
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Acknowledgments
This cooperative research is funded by the Federal Highway Administration (FHWA) (Grant No. UNSPECIFIEDDTFH61-98-C-00094) on the U.S. side, and by the National Center for Research on Earthquake Engineering (NCREE) on the Taiwan side. Their support is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 3 • March 2010
Pages: 255 - 264
Copyright
© 2010 ASCE.
History
Received: Jan 10, 2008
Accepted: Sep 7, 2009
Published online: Sep 18, 2009
Published in print: Mar 2010
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