Transactions of Nanjing University of Aeronautics & Astronautics
Influence of Maximum Aggregate Size on Dynamic Size Effect of Concrete Under Low Strain Rates: Meso-scale Simulations
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Abstract:
This study is to explore the influence of maximum aggregate size (MAS) on the failure and corresponding size effect of concrete materials under low strain rates. The failure process of concrete was simulated by the meso-scale numerical method considering the internal heterogeneity of concrete and strain rate effect. Based on the meso-scale method, the failure behavior of concrete specimens with different structural sizes and MAS was investigated. Also, the influence of MAS on the failure modes, nominal strength and corresponding size effect of concrete were studied at the meso-scale. The simulation results indicated that MAS has an obvious influence on the failure modes of concrete subjected to axial compressive and tensile loads. The nominal tensile strength increased as the MAS increased, while the nominal compressive strength increased first and then decreased as the MAS increases under quasi-static load. In addition, it was found that the size effect on nominal strength of concrete would be weakened with the increase of strain rate. When the applied strain rate reached 1 s-1, the size effect on nominal strength of concrete disappeard. Moreover, the MAS has an ignorable influence on the dynamic size effect of concrete under uniaxial compression and tension.
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TU528.1
CHINA AERO-SCIENCES
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