Experimental Study on the Performance of Lap-Spliced Steel Bars in Ultrahigh-Performance Concrete
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 1
Abstract
Ultrahigh-performance concrete (UHPC) is a new cementitious composite material that exhibits a high bond strength with steel reinforcement. To investigate the splice performance levels of steel bars in UHPC, mutual pullout tests on lap-spliced specimens and direct central pullout tests on bond-anchorage specimens were conducted in this work. The main variables included loading mode, concrete cover, and steel bar position. The results showed that the splice strength of lap-spliced steel bars was approximately 0.76 times the bond strength of the anchored steel bar with the same bond length. The splice strengths of specimens under one-way repeated loading were lower than those under monotonic loading; increasing the splice length or concrete cover thickness reduced the weakening effect of one-way repeated loading on lap-spliced specimen performance. The concrete cover thickness showed a strong positive linear correlation with the splice strength in the range of to and played an important role in stopping crack development in the specimens. The splice strengths decreased when the loading steel bar was moved from the middle of the structure to the side. Based on the experimental results, formulas for the splice strength and critical splice length of lap-spliced steel bars in UHPC under monotonic loading and one-way repeated loading are suggested. Finally, an analytical model for the bond slip of lap-spliced steel bars is proposed, providing a good fit with the test results.
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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
The authors express their gratitude and sincere appreciation for the support provided by the National Natural Science Foundation of China (Grant No. 51978662), and the Natural Science Foundation of Hunan Province (Grant No. 2020JJ4705). The authors also thank the technicians who contributed during the experimental work.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 1 • January 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 1, 2023
Accepted: Jun 22, 2023
Published online: Oct 27, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 27, 2024
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