Bull Earthquake Eng 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 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
Bulletin of Earthquake Engineering – Springer Journals
Published: Jun 5, 2018
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