Experimental Investigation of the Shear Behavior of Slender Continuous Steel–Concrete Composite Girders in Hogging Moment
Publication: Journal of Structural Engineering
Volume 149, Issue 1
Abstract
Predicting the shear strength of composite girders is critical in improving the efficiency of bridge engineering. To investigate the shear behavior of slender continuous steel–concrete composite girders commonly employed in bridge structures in hogging moment regions, experiments were conducted on three slender two-span continuous composite girders with the moment/shear ratio of the section at the interior support as the test parameter. The test results showed that all three continuous girders experienced web shear buckling and shear failure of the concrete slabs. As the moment/shear ratio increased from 0.59 to 0.89, the shear strength decreased by 12.5%. The shear strengths of the specimens were evaluated using the design methods in the existing AASHTO and Eurocode 4 codes, as well as the one proposed by Liang et al. They were 21%–38% and 33%–50% higher than those calculated by the existing AASHTO and EC4 codes, respectively, indicating that the two codes yielded very conservative results. A numerical study was conducted using the nonlinear finite element model validated by the test results. The results showed that the moment/shear ratio, concrete slab thickness, and web height-to-thickness ratio all significantly influence the shear strength; the codes will yield increasingly conservative predictions with the increase of concrete slab thickness or web height-to-thickness ratio. Both test and numerical results revealed that the design method proposed by Liang et al. can better predict the shear strength of continuous composite girders in hogging moment regions.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors express their sincere gratitude to Xuhongzhou and Xiaoyue Zhang for their contributions in data collection and test implementation. This work was supported by the National Natural Science Foundation of China (Nos. 51878099 and 52078081) and the Natural Science Foundation of Chongqing (No. cstc2021jcyj-msxmX0937).
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Published In
Journal of Structural Engineering
Volume 149 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 1, 2022
Accepted: Aug 24, 2022
Published online: Nov 3, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 3, 2023
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