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| WW three-parameter rate-dependent dynamic constitutive model |
| Revised:April 02, 2003 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20046115 |
| KeyWord:viscoplastic,rate-dependent,strain rate,internal variable,dynamic response |
| Xiao Shiyun Lin Gao Li Hongnan~* |
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| Abstract: |
| Based on the concept of viscoplastic consistency model, a modified Willam-Warnke three-parameter viscoplastic model with the effect of strain rate on concrete taken into account is developed. The dynamic uniaxial stress-strain response of the experiments carried out by the authors are used as the database to establish the model. Compared this model with experimental results, it shows that the model can well represent uniaxial dynamic tension and compression behavior of concrete. To study the effect of strain rate on dynamic behavior of concrete structures, a simple supported beam subjected to an impact load at the middle of the span is analyzed as an example. Calculated results by employing the present model and those of the linear-elastic model and rate-independent plastic model are compared. It shows that the strain rate dependence of the material not only affects the magnitude of maximum stresses and maximum displacements of the beam, but also affects the stress distribution over the beam. |
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