Simplified Optimum Design Procedure for Special Unbonded Posttensioned Split Precast Shear Walls
Publication: Journal of Structural Engineering
Volume 139, Issue 2
Abstract
In this paper, a set of simplified design equations for an unbonded posttensioned (PT) precast split hybrid shear wall system is developed. Such a system was proposed by the Precast Seismic Structural Systems (PRESSS) and can be used as a bearing wall or a special reinforced concrete wall for building frames, as defined in ASCE/SEI 7, for eliminating residual drift after seismic events. The panels are anchored to the foundation with unbonded PT tendons located at the panel center; adjacent panels are connected with uniformly distributed energy dissipating coupling devices. An iterative design procedure to calculate the required area of the PT reinforcement and the total yield force of all shear connectors in one vertical joint was proposed by PRESSS. This iterative procedure is exact, but tedious and lengthy. A simpler nondimensional chart-based design procedure was proposed by the writers. This procedure is efficient, but has limitations. A noniterative procedure adopted by ACI ITG-5.2, although simple, does not yield the optimum combination of the shear connectors force and PT force. The set of simplified design equations proposed in this study overcomes the shortcomings of these three procedures. It is simple, direct (noniterative), general, and yields the optimum design in fewer number of steps. The proposed design equations predicted values are accurate and are normally within ± 2% of the exact optimum solution.
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Acknowledgments
The writers would like to thank the editor and the reviewers for their suggestions and comments. The writers also thank Dr. Amal Amleh for her advice.
References
American Concrete Institute (ACI) Innovation Task Group 5 (ACI ITG). (2009). “Requirements for design of a special unbonded post-tensioned precast shear wall satisfying ACI ITG-5.1 (ACI ITG-5.2-09) and commentary.” ACI ITG-5.2-09, Farmington Hills, MI.
ASCE/SEI Minimum Design Loads for Buildings and Other Structures Standards Committee. (2005). Minimum design loads for buildings and other structures (ASCE/SEI 7-05)—Seismic provisions. ASCE, Structural Engineering Institute, Reston, VA.
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Precast/Prestressed Concrete Institute (PCI). (2010). PCI design handbook: Precast and prestressed concrete, 7th Ed., PCI, Chicago, IL.
Saqan, E. I., and Hawileh, R. A. (2010). “Non-dimensional design charts for unbonded post-tensioned split precast concrete walls.” PCI J., 55(4), 78–99.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 2 • February 2013
Pages: 294 - 299
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 17, 2011
Accepted: Apr 24, 2012
Published online: Apr 26, 2012
Published in print: Feb 1, 2013
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