Steel-Reinforced Concrete Coupling Beams. II: Modeling
Publication: Journal of Structural Engineering
Volume 143, Issue 3
Abstract
Using test results presented in previous studies, design and modeling recommendations for steel-reinforced concrete (SRC) coupling beams are provided for both code-based (prescriptive) design approaches and performance-based design approaches. Procedures for computing both nominal and expected (upper bound) moment and shear strengths are described. For embedment, a capacity design approach is recommended in which the provided embedment strength exceeds the expected beam strength. Two approaches are recommended for determination of effective stiffness, one based on using a rigid beam (for flexure and shear) along with an interface rotational spring, since test results from the literature indicate that the majority of the coupling-beam deformations were associated with interface slip/extension, and an alternative approach where the effective stiffness is based on the beam aspect ratio or beam length. Additional parameters are provided to define deformation capacity at significant strength loss (to complete the backbone relations) and to address cyclic degradation.
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Acknowledgments
The work presented in this paper was supported by funds from the Charles Pankow Foundation. This research was performed in a collaboratory renovated with funds provided by the National Science Foundation under Grant No. 0963183, which is an award funded under the American Recovery and Reinvestment Act of 2009 (ARRA). Any opinions, findings, and conclusions expressed in this material are those of the authors and do not necessarily reflect those of the Charles Pankow Foundation or the National Science Foundation. Special thanks are extended to Steve Keowen, Alberto Salamanca, and Harold Kasper for assistance with laboratory testing.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 3 • March 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Jan 15, 2016
Accepted: Aug 3, 2016
Published online: Oct 17, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 17, 2017
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