Flexural Behavior of Steel–UHPC Composite Beams with Waffle Slabs under Hogging Moment
Publication: Journal of Bridge Engineering
Volume 27, Issue 11
Abstract
This paper investigates the flexural behavior of steel–UHPC composite beams with waffle slabs (SUCBWS) under hogging moment. A three-point, reduced-scale flexural test was performed to investigate the effect of reinforcement ratio and partially filled UHPC in the compressive flange of the steel beam. The parameters, including the force ratio R, the laying length Lpfu, and thickness Hpfu of partially filled UHPC, were analyzed. A theoretical formulation was proposed to calculate the flexural capacity of SUCBWS under the hogging moment. The results show that the increase of reinforcement ratio and partially filled UHPC in the compressive flange of steel beam can improve the crack resistance and the flexural capacity of SUCBWS under the hogging moment. Force ratios of 0.22 and 0.48 are recommended for SUCBWS and partially filled steel–UHPC composite beams with waffle slabs (PFSUCBWS), respectively. It was also found that the reasonable laying length and thickness of partially filled UHPC should not be less than 0.5 times the clear span of the specimen (0.5l0) and 0.2 times the web height of the steel beam (0.2hw), respectively. The theoretical predictions based on the proposed formulas are in good agreement with the test results and numerical results.
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Acknowledgments
This work presented here was supported by the Key Projects in the Science & Technology Pillar Program of Tianjin (Grant No. 16YFZCSF00460) and the Tianjin Transportation Science and Technology Development Plan Project (Grant No. 2019B-21). The authors gratefully express their gratitude for the financial supports.
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Published In
Journal of Bridge Engineering
Volume 27 • Issue 11 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 26, 2021
Accepted: Jun 21, 2022
Published online: Sep 1, 2022
Published in print: Nov 1, 2022
Discussion open until: Feb 1, 2023
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Cited by
- Zachary B. Haber, Benjamin A. Graybeal, Strengthening of Steel Through-Girder Bridges Using UHPC and Post-Tensioning, Journal of Bridge Engineering, 10.1061/JBENF2.BEENG-6272, 29, 3, (2024).