| Strain rate effects on dynamic behavior of reinforcement concrete columns with various reinforcement ratio |
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| 作者姓名： | XU Bin TANG Liang and LONG Yeping |
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| 作者单位： | College of Civil Engineering; Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, P.R.China;College of Civil Engineering, Hunan University, Changsha 410082, P.R.China;College of Civil Engineering, Hunan University, Changsha 410082, P.R.China |
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| 摘 要： | The mechnical characteristics of concrete is sensitive to the strain rate and it is crucial to consider the effect of load rates on the behavior of reinforced concrete (RC) structures subjected to dynamic loads such as severe earthquakes. In this study, numerical simulations on the dynamic behavior of typical RC column specimens under dynamic loadings with different load rates were performed. Concrete constitutive model considering the strain rate effects proposed by the CEB code was employed with a fiber model to characterize the nonlinear strain rate dependent behavior of RC columns. The developed dynamic fiber element model was validated by comparing the simulated results of four RC column specimens with the fast loading test results. Results show that the developed fiber element model can predict the behavior of RC columns with acceptable accuracy. After valiating the proposed fiber elemen model considering the strain rate effect, the load carrying capacity of different RC columns with various longitudinal reinforcement ratios and volumetric stirrup ratios were simulated. Results show that the trends of the influences of longitudinal reinforcement ratios and volumetric stirrup ratios on the load carrying capacity of the RC columns under dynamic loadings are different.
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| 关 键 词： | reinforced concrete columns reinforcement ratios strain rate effects parametrical analysis numerical simulation fiber model method |
Strain rate effects on dynamic behavior of reinforcement concrete columns with various reinforcement ratio |
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| XU Bin,TANG Liang and LONG Yeping.Strain rate effects on dynamic behavior of reinforcement concrete columns with various reinforcement ratio[J].Storage & Process,2012(Z2):11-16. |
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| Authors: | XU Bin TANG Liang and LONG Yeping |
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| Institution: | College of Civil Engineering; Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, P.R.China;College of Civil Engineering, Hunan University, Changsha 410082, P.R.China;College of Civil Engineering, Hunan University, Changsha 410082, P.R.China |
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| Abstract: | The mechnical characteristics of concrete is sensitive to the strain rate and it is crucial to consider the effect of load rates on the behavior of reinforced concrete (RC) structures subjected to dynamic loads such as severe earthquakes. In this study, numerical simulations on the dynamic behavior of typical RC column specimens under dynamic loadings with different load rates were performed. Concrete constitutive model considering the strain rate effects proposed by the CEB code was employed with a fiber model to characterize the nonlinear strain rate dependent behavior of RC columns. The developed dynamic fiber element model was validated by comparing the simulated results of four RC column specimens with the fast loading test results. Results show that the developed fiber element model can predict the behavior of RC columns with acceptable accuracy. After valiating the proposed fiber elemen model considering the strain rate effect, the load carrying capacity of different RC columns with various longitudinal reinforcement ratios and volumetric stirrup ratios were simulated. Results show that the trends of the influences of longitudinal reinforcement ratios and volumetric stirrup ratios on the load carrying capacity of the RC columns under dynamic loadings are different. |
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| Keywords: | reinforced concrete columns reinforcement ratios strain rate effects parametrical analysis numerical simulation fiber model method |
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