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| Rate-dependent endochronic damage constitutive model for concrete |
| Received:February 21, 2011 Revised:November 15, 2011 |
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| DOI：10.7511/jslx20124020 |
| KeyWord:concrete strain rate endochronic damage constitutive model nonlinear analysis |
| Author | Institution |
| 宋玉普 |
大连理工大学建设工程学部, 大连 |
| 刘浩 |
大连理工大学建设工程学部, 大连 |
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| Abstract: |
| Concrete is a type of rate-dependent material.In order to describe the strength and deformation characteristics of concrete under impact loads,an endochronic damage constitutive model with the effect of strain rate taken into account is proposed.In this model,the elasto-plasticity of concrete is described by endochronic theory,so that the concept of the yield surface is not needed.And the behavior of stiffness degeneration due to microcrack propagation is described by damage theory.Based on the dynamic experiments,incremental evolvement law of damage is introduced.The comparison of numerical and experimental results shows that the model can well represent the uniaxial and biaxial dynamic behavior of concrete.Finally,the proposed model is used to analyze a simply supported beam loaded by an impact displacement load at the middle of the span.The analyzing result shows that the strain rate dependence of the material can have a great effect on the strength and stiffness of concrete structures subjected to impact loads. |
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