Numerical Study of Masonry-Infilled RC Frames Retrofitted with ECC Overlays
Publication: Journal of Structural Engineering
Volume 140, Issue 7
Abstract
This paper presents a nonlinear finite-element modeling method to evaluate the seismic performance of reinforced concrete (RC) frames that have unreinforced masonry infill walls retrofitted with engineered cementitious composite (ECC) overlays. The method has been validated by results of shake-table tests conducted on a -scale, three-story, two-bay, infilled frame. Results of a numerical study conducted with the validated model have provided further insight into the performance of a structure retrofitted with this technique. A simplified analytical method to assess the shear capacity of an ECC overlay and determine the number and size of shear dowels required to prevent dowel failure has been proposed to ensure a more ductile behavior of the retrofitted structure. Results have shown that the performance of a retrofitted system can be greatly improved by preventing dowel failure so that the benefit of the ductile inelastic behavior of the ECC can be fully exploited. Furthermore, methods to estimate and account for the influence of the construction sequence and material creep on the distribution of gravity loads between the RC columns and infill walls in a finite-element model are presented.
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Acknowledgments
The research presented here was supported by the National Science Foundation Grant No. 0530709 awarded under the George E. Brown, Jr. Network for Earthquake Engineering Simulation Research (NEESR) program. However, opinions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsor or other contributors. The authors also wish to thank Dr. Marios Kyriakides and Professor Sarah Billington for providing the stress-strain curves for the ECC material.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 7 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 4, 2013
Accepted: Aug 29, 2013
Published online: Apr 4, 2014
Published in print: Jul 1, 2014
Discussion open until: Sep 4, 2014
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