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Advances in Concrete Construction Volume 10, Number 2, August 2020 , pages 113-125 DOI: https://doi.org/10.12989/acc.2020.10.2.113 |
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Study on bond behavior of steel reinforced high strength concrete after high temperatures |
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Zongping Chen, Ji Zhou and Xinyue Wang
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| Abstract | ||
| This paper presents experimental results on bond-slip behavior of steel reinforced high-strength concrete (SRHC) after exposure to elevated temperatures. Three parameters were considered in this test: (a) high temperatures (i.e., 20oC, 200oC, 400oC, 600oC, 800oC); (b) concrete strength (i.e., C60, C70, C80); (c) anchorage length (i.e., 250 mm, 400 mm). A total of 17 SRHC specimens subjected to high temperatures were designed for push out test. The load-slip curves at the loading end and free end were obtained, the influence of various variation parameters on the ultimate bond strength and residual bond strength was analyzed, in addition, the influence of elevated temperatures on the invalidation mechanism was researched in details. Test results show that the shapes of load-slip curves at loading ends and free ends are similar. The ultimate bond strength and residual bond strength of SRHC decrease first and then recover partly with the temperature increasing. The bond strength is proportional to the concrete strength, and the bond strength is proportional to the anchoring length when the temperature is low, while the opposite situation occurs when the temperature is high. What\'s more, the bond damage of specimens with lower temperature develops earlier and faster than the specimens with higher temperature. From these experimental findings, the bond-slip constitutive formula of SRHC subjected to elevated temperatures is proposed, which fills well with test data. | ||
| Key Words | ||
| steel reinforced high strength concrete; elevated temperatures test; P-S curve; bond strength calculation; constitutive | ||
| Address | ||
| Zongping Chen: College of Civil Engineering and Architecture, Guangxi University, 530004 Nanning, P.R. China; Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, P.R. China Ji Zhou, Xinyue Wang: College of Civil Engineering and Architecture, Guangxi University, 530004 Nanning, P.R. China | ||
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