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Title |
Study on the Variation of Energy Dissipation Factor of Reinforced Concrete Beam under Cyclic Loading
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Authors |
유석형(Suk-Hyeong Yoo) ; 강대영(Dae-Young Kang) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.6.86 |
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Keywords |
성능기반설계; 이력거동모델; 비선형시간이력해석; 포락선; 에너지소산계수 Performance-based design; Hysteretic behavior model; Nonlinear time history analysis; Envelope curve; Energy dissipation factor |
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Abstract |
As the hysteretic behavior of reinforced concrete members under cyclic loading progresses, the energy dissipation ability decreases due to a decrease in stiffness and strength and pinching effects. However, the guideline “Nonlinear Analysis Model for Performance-Based Seismic Design of Reinforced Concrete Building Structures, 2021” requires calculating a single energy dissipation factor for each member and all histeric step, so the decrease in energy dissipation capacity according to histeric step cannot be considered. It is judged that Therefore, in this study, the energy dissipation factor according to the histeric step was examined by comparing the existing experimental results and the nonlinear time history analysis results for a general beam under cyclic loading. The energy dissipation factor was calculated as the ratio of the energy dissipation amount of the actual specimen to the energy dissipation amount of the idealized elastoplastic behavior obtained as a result of nonlinear time history analysis. In the existing experiment results, the energy dissipation factor was derived by calculating one cycle for each histeric step, and the energy dissipation factor was derived based on the nonlinear modeling process in the guidelines. In the existing experimental study, the energy dissipation factor was calculated by setting each histeric step (Y-L-R), and the energy dissipation factor was found to be 0.36 in the Y-L step and 0.28 in the L-R step, and the energy dissipation factor in the guideline was found to be 0.31. This shows that the energy dissipation factor calculation formula in the guidelines does not indicate a decrease in the energy dissipation capacity of reinforced concrete members.
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