Meso-Numerical Simulation of Dynamic Compressive Performance and Failure Mode of Wet-Screened Concrete

Abstract

Abstract: Wet-screened concrete is usually used to replace hydraulic fully graded concrete which is inconvenient to carry out physical test due to the large aggregate size. In order to study the influence of loading rate on the mechanical properties and failure modes of wet-screened concrete, the meso-numerical specimen of wet-screened two-graded concrete was established by using particle flow discrete element software PFC^2D. The meso-parameters of mortar particles, coarse aggregate particles and the interface between mortar particles and coarse aggregate particles in the numerical specimen were calibrated according to the quasi-static uniaxial compression test data with strain rate of 10^-5 s^-1. Then dynamic loading with strain rates of 10^-4 s^-1, 10^-3 s^-1 and 10^-2 s^-1 was carried out, and numerical simulation and mechanism analysis of dynamic mechanical properties and failure modes were conducted. The results show that the shapes of stress-strain curves under different strain rates are similar, the peak stress increases by 7.3%~37.9% with the increase of strain rate, and the strain at the peak stress increases little. The failure mode of the specimen is in good agreement with the physical test phenomenon. With the increase of strain rate, the number of cracks continues to increase, and the cracks distribution tend to be uniform. The growth rate of the number of cracks is 4.2 times of the growth rate of peak stress. In addition, with the increase of strain rate, the non-uniformity of particle contact force in the numerical specimen decreases, which indicates that the increase of dynamic strength is related to the non-uniformity of stress in the concrete.

Key words: wet-screened concrete, PFC^2D, strain rate, stress-strain relationship, meso-parameter, failure mode

CLC Number:

TU528

ZHANG Qingfang, HONG Hexuan, SHEN Lu. Meso-Numerical Simulation of Dynamic Compressive Performance and Failure Mode of Wet-Screened Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2283-2291.

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