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Structural Engineering and Mechanics Volume 52, Number 3, November10 2014 , pages 559-572 DOI: https://doi.org/10.12989/sem.2014.52.3.559 |
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Flexural behavior of reinforced lightweight concrete beams under reversed cyclic loading |
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Li-Kai Chien, Yi-Hao Kuo, Chung-Ho Huang, How-Ji Chen
and Ping-Hu Cheng
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| Abstract | ||
| This paper presents the results of an experimental investigation on the flexural behavior of doubly reinforced lightweight concrete (R.L.C.) beams tested under cyclic loading. A total of 20 beam specimens were tested. Test results are presented in terms of ductility index, the degradation of strength and stiffness, and energy dissipation. The flexural properties of R.L.C. beam were compared to those of normal concrete (R.C.) beams. Test results show that R.L.C. beam with low and medium concrete strength (20, 40MPa) performed displacement ductility similar to the R.C. beam. The ductility can be improved by enhancing the concrete strength or decreasing the tension reinforcement ratio. Using lightweight aggregate in concrete is advantageous to the dynamic stiffness of R.L.C. beam. Enhancement of concrete strength and increase of reinforcement ratio will lead to increase of the stiffness degradation of beam. The energy dissipation of R.L.C beam, similar to R.C. beam, increase with the increase of tension reinforcement ratio. The energy dissipation of unit load cycle for smaller tension reinforcement ratio is relatively less than that of beam with higher reinforcement ratio. | ||
| Key Words | ||
| reinforced concrete; lightweight aggregate; cyclic loading; ductility; stiffness; energy dissipation | ||
| Address | ||
| Li-Kai Chien: Department of Earth Sciences and Institute of Geophysics, National Central University, Taiwan Yi-Hao Kuo: Department of Civil Engineering, National Chung-Hsing University, Taiwan Chung-Ho Huang: Department of Civil Engineering, National Taipei University of Technology, Taiwan How-Ji Chen: Department of Civil Engineering, National Chung-Hsing University, Taiwan Ping-Hu Cheng: Department of Earth Sciences and Institute of Geophysics, National Central University, Taiwan | ||