Abstract
Alkali-resistant glass fiber reinforced concrete (AR-GFRC) has greatly improved in terms of tensile strength, toughness, durability, and reduction of cracking, which has been proven by testing. However, the constitutive relationship of fiber reinforced concrete under complicated stress represents a complex theoretical problem. In order to investigate the microscopic damage evolution and failure mechanism of AR-GFRC, the meso-statistical damage theory, microcontinuum theory, and composite material theory were considered, and uniaxial tensile tests of two types of AR-GFRC were conducted. A new damage variable expression of the AR-GFRC was proposed, and the stress-strain curve was redefined by considering the residual strength based on experimental fitting parameters and statistical parameters. A Weibull distribution was assumed and a statistical damage constitutive model was developed of the deformation process of the AR-GFRC while considering the residual strength effect; detailed calculation methods to determine the mechanical and statistical parameters of the concrete were developed. The validation results show that the theoretical stress-strain curve of the constitutive model is in good agreement with the experimental curve and the trend is consistent.
Highlights
Concrete is used as an indispensable engineering material in construction for a wide range of long-term applications, but gradually shows its own defects, such as plastic shrinkage cracking, fatigue, and brittleness [1,2]
Uniaxial tensile tests were conducted for concrete with additions of alkali-resistant glass fiber with different fiber contents
The effects of fiber content on the concrete tensile strength were described macroscopically based on the types of failures of the concrete specimens
Summary
Concrete is used as an indispensable engineering material in construction for a wide range of long-term applications, but gradually shows its own defects, such as plastic shrinkage cracking, fatigue, and brittleness [1,2]. Experimental research on the long-term mechanical properties of concrete has shown that the tensile properties, crack resistance, and brittleness can be significantly improved when a certain amount of alkali-resistant glass fiber is added [4]. The microscopic damage evolution and failure mechanism of alkali-resistant glass fiber reinforced concrete (AR-GFRC) is not yet clearly understood. The long-term mechanical properties of concrete require improvements, and the microscopic damage evolution and failure mechanism of AR-GFRC must be explored and understood; this is an urgent problem that must be addressed to achieve safe, reliable, and stable operation of concrete structures. The tensile properties and crack resistance of concrete are greatly influenced by glass fiber, as demonstrated by Tassew, Lubell [5], and Kizilkanat [6]. Yildizel et al [8,9] proposed a stochastic
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