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Bond-slip Model Between Ultra-high-performance Fibre Reinforced Concrete(UHPFRC)and Reinforcement(PDF)


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Bond-slip Model Between Ultra-high-performance Fibre Reinforced Concrete(UHPFRC)and Reinforcement
KANG Shao-bo12 WANG Ruo-yun12 WANG Dan-dan12
1. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
UHPFRC bond strength analysis method bond-slip model
Through the analysis and calculation of two kinds of bond-slip models(modified FIB model and Marchand model), the stress balance equation and deformation compatibility equation of reinforcement micro segment in bond zone were established. The accuracy of the model with different embedded lengths and load levels was studied. The results show that when the embedded length of reinforcement is short, the bond stress at the free end of the reinforcement is small, and the bond stress at the loading end is large. The Marchand model and modified FIB model are in good agreement with the test curve. With the increase of load, the bond stress tends to be uniform along the embedded length of reinforcement. When the embedded length of reinforcement is long, the bond stress at the free end of reinforcement is far less than that at the loading end, and the Marchand model is in good agreement with the test curve. With the increase of load, the calculation results of Marchand model and modified FIB model are close to each other, and they are in good agreement with the test results. When the embedded length is 8 times of the diameter of the reinforcement, the bond stress of the reinforcement along the embedded length presents an obvious nonlinear distribution, and the bond stress at the free end is close to 0.


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Last Update: 2020-10-15