Collapse Performance of Nominally Identical Nonductile Circular Columns Susceptible to Failure-Mode Variability
Publication: Journal of Structural Engineering
Volume 147, Issue 6
Abstract
Recent analytical studies have highlighted the existence of a failure-mode transition zone within which nominally identical test specimens may experience variability in failure mode between a flexure-dominated and a shear-dominated mechanism. This paper presents a study on the seismic response of four nominally identical nonductile RC circular columns susceptible to failure-mode uncertainty designed to represent typical New Zealand pre-1995 poorly detailed gravity columns. In this study, the influence of inherent material uncertainty and displacement history on the collapse response of the nominally identical columns was investigated. Experimental results showed that the failure mode of lightly confined RC columns can be influenced by displacement history and inherent material uncertainty. As observed in this study, the nominally identical columns experienced different failure modes, even under the same loading protocol, leading to a significant variation in drift capacity at axial failure (ranging from 1.5% to 2.6%) and residual axial capacity of RC columns (ranging from 200 to 650 kN).
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (all figures and tables).
Acknowledgments
The first author would like to acknowledge the Ph.D. scholarship support from QuakeCoRE—a New Zealand Tertiary Education Commission-funded Centre. This is QuakeCoRE Publication No. 0619. This experimental program was also fully supported by QuakeCoRE. The authors would like to acknowledge the assistance provided by Samuel Roeslin, Lucas Hogan, Ash Puranam, Rob Corney, Geoff Kirby, Arpit Joshi, Patrick Rogers, Mark Byrami, and Nimra Umair during the construction and testing phases of this project.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 21, 2020
Accepted: Jan 27, 2021
Published online: Mar 31, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 31, 2021
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