Bending Capacity and Elastic Stiffness for a Novel Configuration of Cold-Formed U-Shaped Steel-and-Concrete Composite Beams
Publication: Journal of Structural Engineering
Volume 145, Issue 10
Abstract
This paper discusses a novel cold-formed U-shaped steel and concrete composite beam (RCUCB) for which a reinforcement truss is furnished to stiffen the open steel U-section. Inverted U-shaped reinforcements are assembled to enhance the interface between a concrete flange and a beam web, which includes the bottom reinforcement, concrete fill, and steel U-section. A longitudinal bottom reinforcement is installed to control the slip between the concrete web and the steel U-section. Ten specimens were tested under bending moment, and all exhibit a typical flexural failure. Significant integrity for the RCUCB can be achieved through the enhancement of the reinforcement truss and inverted U-shaped reinforcement. A modified method for determining the shear connection degree of the RCUCB is proposed, which considers the contributions from the inverted U-shaped reinforcement, neck concrete, and reinforcement truss. Two transformed section methods were adopted to determine the elastic stiffness. In addition, a simplified bending capacity calculation method is presented.
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Acknowledgments
This research is supported by the National Natural Science Foundation of China (Grant No. 51878098) and the National Key Research and Development Program of China (Grant Nos. 2016YFC0701201 and 2017YFC0703805), to which the authors are very grateful.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 10, 2018
Accepted: Feb 27, 2019
Published online: Aug 7, 2019
Published in print: Oct 1, 2019
Discussion open until: Jan 7, 2020
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