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Concrete is a typical heterogeneous and multiscale material, and the macro-mechanical response is affected by the meso-scale geometric structure and mechanical parameters. Based on the continuum-discontinuum element method, this study conducts the numerical simulation and quantitively studies the change trend of macro-mechanical response with the different mesoscopic heterogeneity. First, a full-time numerical simulation is conducted, and the elastic modulus and cohesive strength at the meso-scale are assumed to obey the Weibull distribution. Then, the change trend of macro-mechanical parameters is studied. Finally, the change trend of crack evolution characteristic is studied. The results show that the macro-elastic modulus and macro-peak stress gradually increase with the increase of shape parameter k, and the growth rate of macro-mechanical parameters gradually decays. The difference in the shape parameter k causes the value of crack ratio to change, while the change trend of crack ratio-strain curve is similar. As the shape parameter k increases, the final value of crack ratio first decreases and then increases, and the final value of crack ratio when k = 15 is the smallest.

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Effect of Mesoscopic Heterogeneity of Concrete on the Macro-mechanical Behavior

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  • 出版模式：

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  • 发表日期：

    2025年

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  • Qindong Lin,
  • Chun Feng,
  • Jianfei Yuan,
  • Wenjun Jiao,
  • Yundan Gan

摘要

Concrete is a typical heterogeneous and multiscale material, and the macro-mechanical response is affected by the meso-scale geometric structure and mechanical parameters. Based on the continuum-discontinuum element method, this study conducts the numerical simulation and quantitively studies the change trend of macro-mechanical response with the different mesoscopic heterogeneity. First, a full-time numerical simulation is conducted, and the elastic modulus and cohesive strength at the meso-scale are assumed to obey the Weibull distribution. Then, the change trend of macro-mechanical parameters is studied. Finally, the change trend of crack evolution characteristic is studied. The results show that the macro-elastic modulus and macro-peak stress gradually increase with the increase of shape parameter k, and the growth rate of macro-mechanical parameters gradually decays. The difference in the shape parameter k causes the value of crack ratio to change, while the change trend of crack ratio-strain curve is similar. As the shape parameter k increases, the final value of crack ratio first decreases and then increases, and the final value of crack ratio when k = 15 is the smallest.