Behavior of Precast Concrete Shear Walls for Seismic Regions: Comparison of Hybrid and Emulative Specimens
Publication: Journal of Structural Engineering
Volume 139, Issue 11
Abstract
This paper discusses the lateral load behavior of two, 0.40-scale, hybrid, precast concrete shear wall test specimens and the behavior of a third precast specimen designed to emulate monolithic cast-in-place RC shear walls. The walls had identical overall geometry and were constructed by placing rectangular precast panels across horizontal joints. The hybrid walls used mild steel bars [Grade 400 (U.S. Grade 60)] and high-strength unbonded posttensioning (PT) strands for lateral resistance, whereas the emulative wall used only mild steel bars. The mild steel bars crossing the base joint were designed to yield and provide energy dissipation, with the PT steel in the hybrid walls reducing the residual displacements of the structure. The mild steel bars at the base of the emulative wall and one of the hybrid walls used Type II mechanical splices, while the other hybrid wall used continuous bars grouted into the foundation. Because of the lack of PT steel, the emulative wall developed a large residual uplift at the base joint, resulting in excessive horizontal slip and strength degradation. The behavior of the hybrid wall with Type II splices was also limited, which occurred because of the pullout of the mild steel bars. In contrast, the hybrid wall with continuous mild steel bars showed superior restoring, energy dissipation, and ductile behavior over larger lateral displacements. The results show the potential for the use of precast walls in seismic regions, while also revealing important detailing considerations.
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Acknowledgments
This research was funded by the Charles Pankow Foundation and the Precast/Prestressed Concrete Institute (PCI). Additional support was provided by the High Concrete Group, LLC; the Consulting Engineers Group, Inc.; and the University of Notre Dame. The authors acknowledge the support of the PCI Research and Development Committee and the members of the Project Advisory Panel, including Walt Korkosz (chair) of the Consulting Engineers Group, Inc.; Ken Baur of the High Concrete Group, LLC; Neil Hawkins of the University of Illinois at Urbana-Champaign; S.K. Ghosh of S.K. Ghosh Associates, Inc.; and Dave Dieter of Mid-State Precast, LP. Material donations were provided by Jenny Bass of Essve Tech Inc.; Randy Draginis and Norris Hayes of Hayes Industries, Ltd.; Randy Ernest of Prestress Supply Inc.; Chris Lagaden of Ecco Manufacturing; Stan Landry of Enerpac Precision SURE-LOCK; Richard Lutz of Summit Engineered Products; Shane Whitacre of Dayton Superior Corporation; and Steve Yoshida of Sumiden Wire Products Corporation. Any opinions, findings, conclusions, and/or recommendations expressed in this paper are those of the authors and do not necessarily represent the views of the individuals or organizations listed here.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 11 • November 2013
Pages: 1917 - 1927
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 14, 2011
Accepted: Oct 11, 2012
Published online: Oct 13, 2012
Published in print: Nov 1, 2013
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