Seismic Behavior of Nonductile Reinforced Concrete Beam-Column Frame Subassemblies
Publication: Journal of Structural Engineering
Volume 145, Issue 12
Abstract
The 2010–2011 Canterbury Earthquakes in New Zealand highlighted the vulnerability of gravity load resisting reinforced concrete frames in older buildings that do not comply with modern building design standards. Three full-scale reinforced concrete beam-column-joint frame subassemblies, representative of 1980s construction in New Zealand, were constructed and tested to failure to assess the deformation capacity of the subassemblies. The subassemblies differed in the spacing of joint reinforcement and surface roughening at the ends of the precast beams framing into the joint. The circular columns were nominally identical in all tests and were compression-controlled with a transverse reinforcement ratio of 0.0006 and a ratio of spiral reinforcement spacing to an effective depth () of 0.74. The columns were susceptible to flexure-shear failure. Column failure occurred in all tests, with the failure plane propagating along a diagonal crack for two of the three tests. The lateral drifts at the column axial failure were 2.39% and 3.03% for the two columns that failed along a diagonal crack and 4.85% for the column that did not fail along a diagonal crack. It was demonstrated that the difference in performance can be attributed to variability in concrete strength, which is shown to have a significant influence on the likelihood of flexure-shear failure of the columns.
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Acknowledgments
This research was part of a collaborative study between the University of Auckland and Beca Ltd., and the critical contributions of Rob Jury, Weng Kam, and Andrew Stirrat are gratefully acknowledged. The authors would like to acknowledge the support of the lab technical staff at the University of Auckland, namely Felix Scheibmair, Ross Reichardt, Jay Naidoo, Shane Smith, Andrew Virtue, and Mark Byrami. John O’Hagan, Alex Shegay, Kai Marder, and Lucas Hogan are additionally thanked for their assistance with testing.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 12 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 18, 2018
Accepted: Apr 4, 2019
Published online: Sep 30, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 29, 2020
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