Meso-scale simulations on dynamic splitting tensile behaviors of concrete at elevated temperatures

JIN Liu; HAO Huimin; ZHANG Renbo; DU Xiuli

doi:10.11883/bzycj-2018-0401

Volume 40 Issue 5

May 2020

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JIN Liu, HAO Huimin, ZHANG Renbo, DU Xiuli. Meso-scale simulations on dynamic splitting tensile behaviors of concrete at elevated temperatures[J]. Explosion And Shock Waves, 2020, 40(5): 053102. doi: 10.11883/bzycj-2018-0401

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JIN Liu, HAO Huimin, ZHANG Renbo, DU Xiuli. Meso-scale simulations on dynamic splitting tensile behaviors of concrete at elevated temperatures[J]. Explosion And Shock Waves, 2020, 40(5): 053102. doi: 10.11883/bzycj-2018-0401

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Meso-scale simulations on dynamic splitting tensile behaviors of concrete at elevated temperatures

doi: 10.11883/bzycj-2018-0401

Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

Received Date: 2018-10-17
Rev Recd Date: 2019-01-25
Publish Date: 2020-05-01

Abstract

Abstract

To study the dynamic splitting tensile fracture behaviors of concrete at elevated temperatures, the numerical meso-scale model and method are established by considering the coupling effects of the high temperature degradation and strain rate enhancement of the mechanical properties, and combining with the internal heterogeneities of concrete materials. The simulation method is divided into two steps: the heat conduction behavior is first simulated, then the output results areused as the initial conditions to simulate the dynamic splitting tensile behaviors of the concrete. Based on the good agreement between the numerical simulation results and the experimental phenomenon, the dynamic splitting tensile behaviors and meso-scale failure mechanism of the concrete at elevated temperature are analyzed, the splitting tensile stress-strain relations of the concrete at different strain rates and high temperatures are compared, and the interacting regulation between the temperature degradation and the strain rate effect of concrete is revealed. The results prove that: (1) after high temperature, the damage area in the concrete is more concentrated; (2) the destructed process becomes more rapid as the nominal strain rate is higher, the aggregation is destroyed at room temperature; (3) the internal stress appears date-shaped distributions due to the heterogeneities of the concrete microstructures; (4) the temperature degradation effects on the splitting tensile strength of the concrete is more dramatic comparing with the strain rate effects.
- concrete,
- high temperature,
- dynamic splitting tensile,
- strain rate effect,
- meso-scale

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References(32)

References

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