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Structural Engineering and Mechanics Volume 76, Number 4, November25 2020 , pages 513-528 DOI: https://doi.org/10.12989/sem.2020.76.4.513 |
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Residual behavior of recycled aggregate concrete beam and column after elevated temperatures |
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Zongping Chen, Ji Zhou, Ying Liang and Peihuan Ye
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| Abstract | ||
| This paper presents the results of an experimental study on the residual behavior of reinforced recycled aggregate concrete (RRAC) beam-columns after exposure to elevated temperatures. Two parameters were considered in this test: (a) recycled coarse aggregate (RCA) replacement percentages (i.e. 0, 30, 50, 70 and 100%); (b) high temperatures (i.e. 20, 200, 400, 600, and 800℃). A total of 25 RRAC short columns and 32 RRAC beams were conducted and subjected to different high temperatures for 1 h. After cooling down to ambient temperature, the following basic physical and mechanical properties were then tested and discussed: (a) surface change and mass loss ratio; (b) strength of recycled aggregate concrete (RAC) and steel subjected to elevated temperatures; (c) bearing capacity of beam-columns; (d) load-deformation curve. According to the test results, the law of performance degradation of RRAC beam-columns after exposure to high temperatures is analyzed. Finally, introducing the influence coefficient of RCA replacement percentage and high temperatures, respectively, to correct the calculation formulas of bearing capacity of beam-columns in Chinese Standard, and then the residual bearing capacity of RRAC beam-columns subjected elevated temperatures is calculated according to the modified formulas, the calculated results are in good agreement with the experimental results. | ||
| Key Words | ||
| reinforced recycled aggregate concrete (RRAC); beam-columns; elevated temperatures; performance degradation; residual bearing capacity | ||
| Address | ||
| Zongping Chen, Ji Zhou, Ying Liang and Peihuan Ye: College of Civil Engineering and Architecture, Guangxi University, 530004 Nanning, P.R. China. Zongping Chen: Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004,Guangxi, P.R. China | ||