Abstract
Twelve ultrahigh-strength concrete (UHSC) columns confined by rectangular hoops and crossties were constructed and tested under pure axial load. Primary variables of the investigation were the amount, spacing, and configuration of transverse reinforcement, and concrete compressive strength, ranging from 50 to 200 MPa. The amount of transverse reinforcement ranged from 53 to 151% of that required by the American Concrete Institute (ACI) seismic design provisions. Four different configurations of transverse reinforcement were investigated that included hoops as well as hoops and crossties. The behavior of UHSC columns are characterized by sudden spalling of the concrete cover and extremely brittle failure unless the columns are adequately confined with transverse reinforcement. Therefore, more confinement is required in a column with higher concrete strength than in a column with lower concrete strength to achieve a reasonable postpeak response and sufficient deformability. The amount of transverse reinforcement has a pronounced effect on the postpeak behavior of UHSC columns. It is concluded that the ACI provisions overestimate the maximum axial load by 8–21%; however, the seismic design provisions provide for significant postpeak response of the UHSC columns in this test series. A design expression is proposed for the amount of seismic confinement for 200 MPa UHSC columns, based on the effective confinement index.
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Acknowledgments
This research was supported by a grant (Code# ’09 R&D A01) from Cutting-edge Urban Development Program funded by Ministry of Land, Transport and Maritime Affairs of the Korean government.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 6 • June 2015
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© 2014 American Society of Civil Engineers.
History
Received: Oct 2, 2013
Accepted: Apr 29, 2014
Published online: Jul 24, 2014
Discussion open until: Dec 24, 2014
Published in print: Jun 1, 2015
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