Shake Table Testing of Slender RC Shear Walls Subjected to Eastern North America Seismic Ground Motions
Publication: Journal of Structural Engineering
Volume 138, Issue 12
Abstract
This paper presents shake table test results on two identical 1:0.429 scaled, 8-story moderately ductile RC shear wall specimens under the expected high-frequency ground motion in eastern North America. The walls were designed and detailed according to the seismic provisions of the NBCC 2005 and CSA-A23.3-04 standards. The objectives were to validate and understand the inelastic responses and interaction of shear and flexure and axial loads in the plastic hinge zones of the walls taking into consideration the higher-mode effects. One specimen was tested under incremental ground motion intensities ranging from 40 to 120% of the design level. The intensity range was increased from 100 to 200% for the second specimen. The response of the walls was significantly affected by the second mode, causing an inelastic flexural response to develop at the base as well as at the sixth level. Dynamic amplification of the base shear forces was also observed in both walls. In the second wall, which was tested in the undamaged condition, peak base shear forces occurred prior to significant inelastic rotation and the contribution to concrete of shear resistance exceeded the value used in the design. Once inelastic rotation had developed that contribution corresponded to the value obtained using a value of 0.18 for the reduction factor accounting for concrete cracking. Inelastic rotation in the upper wall region was found to limit the force demand imposed by the higher-mode response.
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Acknowledgments
The financial support provided by the Quebec Fund for Research on Nature and Technology (FQRNT) and the Natural Science and Engineering Research Council of Canada (NSERC) is acknowledged. The authors express their appreciation to Professor Dan Palermo, from the University of Ottawa, and Professor Sanda Koboevic and Professor Najib Bouaanani, from École Polytechnique, for technical input in the design of the test specimens. The authors acknowledge the most relevant and thorough comments made by the reviewers.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1515 - 1529
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jul 3, 2010
Published online: May 21, 2011
Accepted: Feb 16, 2012
Published ahead of production: May 21, 2012
Published in print: Dec 1, 2012
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