Fatigue Tests on Steel–Concrete Composite Beams Subjected to Sagging Moments
Publication: Journal of Structural Engineering
Volume 145, Issue 5
Abstract
Current shear stud fatigue capacity recommended for design of shear connectors is based on experimental data from push-out tests, and there is a need to experimentally evaluate the fatigue performance of shear connectors in steel-concrete composite beams. Therefore, this paper presents the results of four composite beams tested under fatigue with different degrees of shear connection. The fatigue testing was carried out to a million cycles under bending with two different amplitudes. The residual strength of steel-concrete composite beams was evaluated by performing static tests until failure after the completion of the fatigue tests for each of the specimens. The testing measurements included midspan deflection, slippage between the steel beam and concrete deck, shear connector strains, and strains in the concrete deck and bottom steel flange. Based on the experimental results, degrees of the shear connection between the steel beam and the concrete deck played a major role in controlling the longitudinal fatigue cracks in the concrete deck. The residual deflection and plastic slippage increased as the fatigue of cycles increased. This is caused by the damage in the concrete deck that developed around the shear studs, which led to a reduction in the composite stiffness. The shear connectors’ strain ranges gradually increased due to the accumulation of damage as the number of cycles increased. Based on the results of this paper, it is concluded that the current shear stud fatigue design curve predicts a lower fatigue life for the shear connectors.
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Acknowledgments
The financial support sponsored by the Ministry of Higher Education of Egypt is gratefully acknowledged. In addition, the generous donation of materials and services from DeLong’s Inc., USA, is greatly appreciated.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 5 • May 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Apr 17, 2018
Accepted: Nov 7, 2018
Published online: Feb 27, 2019
Published in print: May 1, 2019
Discussion open until: Jul 27, 2019
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