Effect of Subduction Earthquake-Based Loading History on Substandard RC Square Columns
Publication: Journal of Bridge Engineering
Volume 23, Issue 3
Abstract
The cyclic behavior of RC bridge columns with a square cross section was experimentally evaluated using two types of quasi-static cyclic deformations, a conventional loading protocol and a loading protocol designed to assess the behavior or capacity of deficient bridge columns under subduction-zone earthquakes. The specimens and the laboratory arrangement were chosen to represent full-scale typical bridge columns constructed in the 1950s to mid-1970s as part of a typical multicolumn bridge bent in the Pacific Northwest. These columns included lap splices of longitudinal bars in the plastic hinge region and lacked sufficient transverse reinforcement details, making them vulnerable to major seismic events. The experimental results showed that the specimens achieved moderate to high displacement ductilities despite the detailing deficiencies, which can be attributed to the flexure-dominated response. More importantly, however, the experimental results illustrated that these types of substandard RC columns can exhibit a shift in the mode of failure and exhibit less strength and displacement capacity under the subduction earthquake-based cyclic protocol compared with more conventional cyclic protocols. A numerical modeling approach was also adopted with the aim of characterizing the response of the specimens. The numerical results show that the model provided a reasonable approximation of the nonlinear behavior of the columns, including stiffness and strength degradation.
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Acknowledgments
This article is based on research funded by the Oregon Department of Transportation (ODOT), whose support is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsors.
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Journal of Bridge Engineering
Volume 23 • Issue 3 • March 2018
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© 2017 American Society of Civil Engineers.
History
Received: Jun 28, 2016
Accepted: Sep 13, 2017
Published online: Dec 19, 2017
Published in print: Mar 1, 2018
Discussion open until: May 19, 2018
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