Mechanism of Size Effect of Concrete Under Biaxial Compression

LI Dong; JIN Liu; DU Xiuli; DU Min

doi:10.11936/bjutxb2016070003

Journal of Beijing University of Technology > 2017 > 43(8): 1190-1198. > DOI: 10.11936/bjutxb2016070003

LI Dong, JIN Liu, DU Xiuli, DU Min. Mechanism of Size Effect of Concrete Under Biaxial Compression[J]. Journal of Beijing University of Technology, 2017, 43(8): 1190-1198. DOI: 10.11936/bjutxb2016070003

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Mechanism of Size Effect of Concrete Under Biaxial Compression

LI Dong^1,,
JIN Liu¹,
DU Xiuli¹,
DU Min^{1, 2}

1.
The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China
2.
Institute of Disaster-prevention Science and Technology, Sanhe 065201, Hebei, China

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Received Date: June 30, 2016
Available Online: August 03, 2022
Published Date: August 09, 2017

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Abstract

Abstract

The size effect and macroscopic nonlinearity of concrete are caused by its inherent heterogeneity. Considering the mesoscopic heterogeneity, concrete was regarded as a tril-phase composite material consisting of aggregate, mortar matrix and the interfacial transition zone (ITZ) at meso-scale. Numerical concrete specimens sized by 150 mm×150 mm, 300 mm×300 mm and 600 mm×600 mm were set up. First, several uniaxial compressive tests of square concrete specimens were conducted and the mechanical parameters of the ITZs were fixed by an inversion method. Then the failure behavior and the size effect of concrete under biaxial compression were analyzed. Some conclusions can be drawn as, 1) damage failure evolves with dimension of the specimen, and difference of the fracture energy dissipated per unit is the main reason of the presence of size effect in concrete subjected to bi-axial compression. 2) an obvious size effect can be observed on the uniaxial/biaxial compressive strength of concrete and the simulation results of present work follow closely the size effect law (SEL) proposed by Bažant.
- concrete,
- biaxial compressive strength,
- size effect,
- mesoscopic failure,
- numerical simulation

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References (24)

References

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Mechanism of Size Effect of Concrete Under Biaxial Compression