Punching Shear Resistance of Corroded Slab–Column Connections Subjected to Eccentric Load
Publication: Journal of Structural Engineering
Volume 149, Issue 1
Abstract
Due to the use of deicing salt, marine and offshore environments may cause rebar corrosion in RC flat-slab floor systems. This increases the possibility of punching shear failure of slab–column connections. However, few research results are available for RC slab–column connections with corroded rebar under eccentric load, which is very common in realistic loading conditions. To fill this gap, 15 full-scale RC flat slab–column connections were fabricated and tested to investigate the performance of corroded slab–column connections under eccentric load. The design variables included reinforcement ratio, loading eccentricity, and degree of rebar corrosion. There were two stages of the experimental process, including (1) accelerated rebar corrosion tests; and (2) quasi-static tests. It was found from the test results that, in general, rebar corrosion had detrimental effects on the punching shear strength and stiffness of the connections. In addition, corrosion of reinforcement may change the failure mode of slab–column connections. However, it was unexpected that the energy-dissipating capacity and deformation capacity of slab–column connections with high reinforcement ratio and small loading eccentricity increased with increasing corrosion degree.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was supported by research grants provided by the National Natural Science Foundation of China (Grant Nos. 52022024 and 52168028) and the Natural Science Foundation of Guangxi (Grant No. 2021GXNSFFA196001). Any opinions, findings, and conclusions expressed in this paper are those of the writers and do not necessarily reflect the views of the National Natural Science Foundation of China.
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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: Aug 14, 2021
Accepted: Jul 15, 2022
Published online: Nov 4, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 4, 2023
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