Mechanical Performance of Steel-Concrete Composite Beams Subjected to a Hogging Moment
Publication: Journal of Structural Engineering
Volume 140, Issue 1
Abstract
Limited experimental results have been reported in the literature on the fatigue and ultimate static loading behavior of composite beams subjected to negative bending moment. This paper examines experimentally the behavior of composite steel-concrete beams. Eight composite specimens were tested to study the various aspects of composite beams under a negative bending moment, including the effects of repeated loading, shear connectors (studs and PBLs), rubber-latex mortar coating, and steel fiber-reinforced concrete (SFRC) on their structural performance. Load versus midspan deflection, crack formation and its developing process, slip distribution on the steel-slab interface, and the flexural strain results of shear connectors were measured and studied. The test results show that the initial cracking-level repeated load did not show obvious effects, while the stabilized cracking-level repeated load can reduce the rigidity and loading capacity of composite beams. The experimental results indicate that the plastic bending moment criteria in the current AASHTO load and resistance factor design specifications are typically conservative for composite beams under a negative bending moment. In addition, the effects of SFRC on crack width control and adhesion bonding effects of rubber latex on the steel-slab interface were confirmed in the testing.
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Acknowledgments
The experimental investigation presented in this paper was carried out at Waseda University, Meisei University, and the TTK Corporation in Japan, and was financed by the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) of Japan. The assistance of the laboratory staff and the financial support are gratefully acknowledged. Any findings, opinions, conclusions, and recommendations expressed in this paper are those of the writers and do not necessarily reflect the views of the MLIT of Japan.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 1 • January 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 31, 2012
Accepted: Jan 3, 2013
Published online: Jan 5, 2013
Published in print: Jan 1, 2014
Discussion open until: Feb 23, 2014
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