Macro and Meso Multi-Scale Nonlinear Finite Element Analysis of Shear-Flexural Beam

Abstract

Abstract: In order to further study the influence of the mesoscopic coarse aggregate gradation on the nonlinear mechanical properties of concrete macroscopic components, the aggregate size satisfying Fuller grading was generated, and the aggregate overlap was judged by the RGB (red, green, bule) value of the placement area pixels, so as to realize the random distribution of aggregate in concrete. On this basis, the equivalent elastic modulus and stiffness matrix of two-dimensional mesoscopic random polygonal aggregate model were solved by homogenization method, and the damage factor of concrete material was introduced to simulate the crack expansion of shear-flexural beam, so a multi-scale nonlinear mechanical model of concrete was established. The results show that when the concrete enters the plastic stage, the correlation between the maximum aggregate size and the damage factor under tension and compression can not be ignored, which directly affects the crack development and the maximum plastic strain of the macroscopic shear-flexural beam. It may also change the failure mode of shear-flexural beam.

Key words: concrete coarse aggregate, multi-scale nonlinearity, Fuller grading, equivalent elastic modulus, shear-flexural beam

CLC Number:

TU528

HU Biao, WANG Xianjie, WANG Siwen, LI Chengyue, WANG Zhaoyi, WENG Zhenjiang. Macro and Meso Multi-Scale Nonlinear Finite Element Analysis of Shear-Flexural Beam[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 836-844.

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