Cyclic loading test of self-centering precast segmental unbonded posttensioned UHPFRC bridge columns

Cyclic loading test of self-centering precast segmental unbonded posttensioned UHPFRC bridge columns Three 1/3-scale precast segmental bridge columns, manufactured with ultrahigh-performance fiber-reinforced concrete (UHPFRC) incorporating river sand and coarse aggregate, were tested under cyclic loading. Energy dissipation (ED) bars, embedded in ultrahigh-performance concrete (UHPC) grout, maintained continuous across segment joints and unbonded at the bottom joint. Self-centering prestressing force was provided by unbonded posttensioning (PT) tendons. The research parameters included PT force level and the amount of ED bars. Test results showed that all the specimens exhibited no less than 8% drift capacities, which were remarked with the first fracture of ED bars. No obvious cracking and limited UHPFRC spalling were observed. Both PT force level and the amount of ED bars have notable effects on stiffness, lateral strength, and ductility. Increased PT force may improve ductility with the total axial loading ratio less than 0.08. All PT tendons were elastic and no yield or rupturing was found, but the stress loss was significant. The equivalent unbonded length can be evaluated with 0.007d b f y for ED bars embedded in UHPC grout. The rotation of the bottom joint dominated lateral deformation and the contribution of joint sliding can be neglected. The contribution λ ED of ED bars to lateral strength should be no more than 25% to maintain self-centering capacity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of Earthquake Engineering Springer Journals

Cyclic loading test of self-centering precast segmental unbonded posttensioned UHPFRC bridge columns

Cyclic loading test of self-centering precast segmental unbonded posttensioned UHPFRC bridge columns

Bull Earthquake Eng (2018) 16:5227–5255 https://doi.org/10.1007/s10518-018-0331-y ORIGINAL RESEARCH PAPER Cyclic loading test of self-centering precast segmental unbonded posttensioned UHPFRC bridge columns 1 1 1 1 • • • • Jingquan Wang Zhen Wang Yuchuan Tang Tongxu Liu Jian Zhang Received: 2 September 2017 / Accepted: 12 February 2018 / Published online: 5 June 2018 Springer Science+Business Media B.V., part of Springer Nature 2018 Abstract Three 1/3-scale precast segmental bridge columns, manufactured with ultrahigh- performance fiber-reinforced concrete (UHPFRC) incorporating river sand and coarse aggregate, were tested under cyclic loading. Energy dissipation (ED) bars, embedded in ultrahigh-performance concrete (UHPC) grout, maintained continuous across segment joints and unbonded at the bottom joint. Self-centering prestressing force was provided by unbonded posttensioning (PT) tendons. The research parameters included PT force level and the amount of ED bars. Test results showed that all the specimens exhibited no less than 8% drift capacities, which were remarked with the first fracture of ED bars. No obvious cracking and limited UHPFRC spalling were observed. Both PT force level and the amount of ED bars have notable effects on stiffness, lateral strength, and ductility. Increased PT force may improve ductility with the total axial loading ratio less than 0.08. All PT tendons were elastic and no yield or rupturing was found, but the stress loss was significant. The equivalent unbonded length can be evaluated with 0.007d f for ED bars b y embedded in UHPC grout. The rotation of the bottom joint dominated lateral deformation and the contribution of joint sliding can be neglected. The contribution k of ED bars to ED lateral strength should be no more than 25% to maintain self-centering capacity. Keywords Bridge columns  Cyclic loading test  Ultrahigh-performance fiber-reinforced concrete (UHPFRC)  Self-centering  Precast...
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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media B.V., part of Springer Nature
Subject
Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Environmental Engineering/Biotechnology; Civil Engineering; Geophysics/Geodesy; Hydrogeology; Structural Geology
ISSN
1570-761X
eISSN
1573-1456
D.O.I.
10.1007/s10518-018-0331-y
Publisher site
See Article on Publisher Site

Abstract

Three 1/3-scale precast segmental bridge columns, manufactured with ultrahigh-performance fiber-reinforced concrete (UHPFRC) incorporating river sand and coarse aggregate, were tested under cyclic loading. Energy dissipation (ED) bars, embedded in ultrahigh-performance concrete (UHPC) grout, maintained continuous across segment joints and unbonded at the bottom joint. Self-centering prestressing force was provided by unbonded posttensioning (PT) tendons. The research parameters included PT force level and the amount of ED bars. Test results showed that all the specimens exhibited no less than 8% drift capacities, which were remarked with the first fracture of ED bars. No obvious cracking and limited UHPFRC spalling were observed. Both PT force level and the amount of ED bars have notable effects on stiffness, lateral strength, and ductility. Increased PT force may improve ductility with the total axial loading ratio less than 0.08. All PT tendons were elastic and no yield or rupturing was found, but the stress loss was significant. The equivalent unbonded length can be evaluated with 0.007d b f y for ED bars embedded in UHPC grout. The rotation of the bottom joint dominated lateral deformation and the contribution of joint sliding can be neglected. The contribution λ ED of ED bars to lateral strength should be no more than 25% to maintain self-centering capacity.

Journal

Bulletin of Earthquake EngineeringSpringer Journals

Published: Jun 5, 2018

References

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