Mesoscopic Uniaxial Tensile Properties of Concrete Based on Rate-Dependent Cohesive Constitutive Model

doi:10.12068/j.issn.1005-3026.2023.11.018

Abstract

Abstract: The research on macroscopic rate-dependence of concrete has achieved very rich results， and its meso structural and material parameters significantly affect the macroscopic mechanical properties of concrete. Therefore， studying the dynamic properties of concrete at the meso-scale is an important way to reveal the macroscopic rate-dependence of concrete. In this paper， the influence of strain rate was introduced to modify the interfacial cohesion constitutive model， and the uniaxial tensile failure mode and mechanical properties of concrete with different aggregate content and shapes were studied under various loading rates from the mesoscale. The results show that the distribution of failure cracks becomes increasingly uniform with the increase of loading rate. The increment in tensile strength of concrete exhibits a linear relationship with the logarithm of strain rate. The tensile strength of concrete decreases linearly with an increase in aggregate content， while the aggregate shape has little effect on it.

Key words: concrete; cohesive constitutive model; loading rate; random aggregate model; uniaxial tension

CLC Number:

TU528.1

XIAO Shi-yun， WANG Yang. Mesoscopic Uniaxial Tensile Properties of Concrete Based on Rate-Dependent Cohesive Constitutive Model[J]. Journal of Northeastern University(Natural Science), 2023, 44(11): 1647-1655.

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