Bond Strength Damage Model between Fiber Reinforced Concrete and High-Strength Steel Bars under Thermal-Cold Cycles

Abstract

Abstract: Through the central pull-out test of ordinary concrete (PC), steel fiber reinforced concrete (SFRC), polypropylene fiber reinforced concrete (PFRC) and HRB500E steel bars after thermal-cold cycles, the deterioration mechanism of different types of concrete was studied, and the influences of thermal-cold cycles on mass loss, relative dynamic elastic modulus and bond strength of PC, SFRC and PFRC were analyzed. The results show that the mass loss and dynamic elastic modulus loss of concrete increase, and the bond strength between reinforcement and concrete decreases after thermal-cold cycles. When steel fiber and polypropylene fiber are added into the specimen, the attenuation of bond strength is weakened, and the inhibition effect of polypropylene fiber is more obvious. Combined with the experimental data, the Petersen model, Xu model and Wu model at home and abroad are compared and analyzed. Considering the influences of thermal-coal cycles on the relative dynamic modulus of elasticity and the relative bond strength, based on Weibull probability distribution theory and strength attenuation model, a bond strength degradation model of fiber reinforced concrete and high-strength steel bar is established, which is verified by the data in this paper. The average value of the ratio between measured value and calculated value is 0.97, and the standard deviation is 0.07, which are in good agreement. The model provides a theoretical reference for the durability design of fiber reinforced concrete structures under thermal-cold environment.

Key words: thermal-cold cycle, fiber reinforced concrete, Weibull probability distribution, bond strength, damage model

CLC Number:

TU528.572

ZHANG Guangtai, LI Ruixiang, LIU Shituo, SAMAT Adil, GENG Tianjiao. Bond Strength Damage Model between Fiber Reinforced Concrete and High-Strength Steel Bars under Thermal-Cold Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1193-1204.

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