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| Modification of a dynamic constitutive model-HJC model forroller-compacted concrete and numerical verification |
| ZHANG Sherong1,2 SONG Ran1,2 WANG Chao1,2 SHANG Chao1,2 WEI Peiyong1,2 |
1.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin 300350, China;
2.School of Civil Engineering, Tianjin University, Tianjin 300350, China
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Abstract It is necessary to understand the dynamic mechanical behaviors and constitutive relations of dam materials in studying the dynamic response of hydraulic roller-compacted concrete (RCC) dam withstand high strain rate loads of impact and explosion.Referring to the mix proportion and the construction method of practical hydraulic concrete dam, RCC specimens were prepared and static compression test and split Hopkinson pressure bar (SHPB) test were conducted to explore the dynamic mechanics of RCC.The HJC model which has been widely used to describe the mechanical behavior of concrete under high strain rate was modified including strength surface, strain rate strengthening effect and failure criterion based on the static and dynamic mechanical test results of RCC.Then SHPB experiment was simulated via the finite element method to verify the effectiveness of modified HJC model.The results demonstrate that the dynamic mechanical properties of RCC under high strain rate impact loading show obvious strain rate effect, the dynamic compressive strength increases with strain rate and is related to the specimen size.The reconstructed stress-strain curve obtained by the numerical simulation matches the SHPB test and the maximum principal strain failure criterion can describe the damage process of RCC specimen during SHPB tests well, so that the improved HJC model basing on test data can predict the dynamic mechanical behavior of RCC under high strain rate loading.The research findings can be used in the anti-impact and explosion design of RCC structures.
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Received: 29 January 2018
Published: 15 June 2019
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