Stiffness and Cracking Behavior of New U-Shaped Steel and Concrete Composite Beam under Negative Bending
Publication: Journal of Structural Engineering
Volume 146, Issue 5
Abstract
This paper discussed the stiffness and cracking behavior of a new kind of reinforcement-stiffened cold-formed U-shaped steel and concrete composite beam (RCUCB) under negative bending. The static behavior of the RCUCB was discussed based on a negative bending experiment of 10 specimens. The reinforcement system consisting of the inverted U-shaped reinforcement, reinforcement truss, and bottom reinforcement was shown to maintain the integral action of the RCUCB, especially after the yield load. The RCUCB was found to behave well in deformability, ductility, and plastic rotation ability under negative bending: (1) the failure deflection and ductility factor reached (where is the effective span) and 17.7 respectively; (2) the ductility factor increased with decreasing steel ratio and decreasing reinforcement ratio; and (3) approximately 84.7%–94.0% of the web height yielded at the peak load, resulting in a plastification coefficient of 1.3–1.9. The damage process was defined with the cracking, yielding, and buckling loads approximately equal to , , and , respectively. During the experiment, the degree of shear connection in the negative bending area showed little effect on the negative bending behavior before yield load. Calculation methods for initial stiffness, second stiffness, and cracking moment were proposed, and the calculation results agreed well with the test results.
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Acknowledgments
The authors are grateful for the support provided by National Natural Science Foundation of China (Grant No. 51878098) and the National Key Research and Development Program of China (Grant Nos. 2016YFC0701201 and 2017YFC0703805).
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Published In
Journal of Structural Engineering
Volume 146 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 15, 2019
Accepted: Oct 2, 2019
Published online: Feb 17, 2020
Published in print: May 1, 2020
Discussion open until: Jul 17, 2020
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