Bond⁃slip behavior and model prediction of fiber⁃reinforced polymer⁃reinforced concrete

doi:10.19491/j.issn.1001-9278.2024.04.008

Abstract

Abstract:

To explore the bonding behavior between the BFRP bars and concrete under dynamic loads， forward and reverse cyclic pull⁃out tests were conducted on the BFRP bars， and their bonding dynamic performance was studied. According to the experimental results， the bond stress⁃strain relationship curve shows that there is a bond behavior between the BFRP reinforcement and concrete under cyclic load， which undergoes four stages of stress characteristics as follows： elastic stage， crack propagation stage， crack closure stage， and friction stage； As the diameter of BFRP polymer bars increased， the bonding strength between the BFRP bars and concrete interface decreased. With an increase in the cycle number， the bond strength between the BFRP reinforcement and concrete decreased， the slip corresponding to the bond strength increased， the shear hysteresis area decreased， and the energy dissipation capacity decreased. Based on the experimental results， a prediction model suitable for calculating the bonding performance between the BFRP bars and concrete under cyclic loading was established， laying an experimental and theoretical foundation for the seismic and fatigue behaviors of the BFRP⁃reinforced concrete.

Key words: basalt fiber?reinforced polymer reinforcement concrete, bonding characteristics, cyclic pull?out test, slip, hysteresis area

CLC Number:

TQ321

CHAI Songhua, DU Hongxiu, WU Kai, HUANG Rui, ZHOU Chici. Bond⁃slip behavior and model prediction of fiber⁃reinforced polymer⁃reinforced concrete[J]. China Plastics, 2024, 38(4): 47-53.

Figures/Tables 14

References 23

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样品编号	黏结强度/MPa						残余黏结强度/MPa
样品编号	n=1	n=3	n=5	n=7	n=9	n=10	残余黏结强度/MPa
FC14⁃1	8.81	4.93	4.32	4.12	4.08	4.05	8.13
FC14⁃2	8.75	5.23	4.84	4.73	4.72	4.72	8.59
FC14⁃3	8.35	4.92	4.24	3.94	3.86	3.85	6.01
FC14⁃4	9.88	4.98	3.92	3.52	3.41	3.39	8.83
FC14⁃5	10.23	6.57	5.78	5.57	5.52	5.51	10.66
平均值	9.20	5.33	4.62	4.37	4.32	4.32	8.43
τ_max，_N /τ_max，1	1.00	0.57	0.50	0.47	0.47	0.47	-
式（6）计算值	1.00	0.57	0.51	0.47	0.46	0.46	-
误差/%	0	0	-2.0	0	2.1	2.1	-

样品编号	黏结强度/MPa						残余黏结强度/MPa
样品编号	n=1	n=3	n=5	n=7	n=9	n=10	残余黏结强度/MPa
FC14⁃1	8.81	4.93	4.32	4.12	4.08	4.05	8.13
FC14⁃2	8.75	5.23	4.84	4.73	4.72	4.72	8.59
FC14⁃3	8.35	4.92	4.24	3.94	3.86	3.85	6.01
FC14⁃4	9.88	4.98	3.92	3.52	3.41	3.39	8.83
FC14⁃5	10.23	6.57	5.78	5.57	5.52	5.51	10.66
平均值	9.20	5.33	4.62	4.37	4.32	4.32	8.43
τ_max，_N /τ_max，1	1.00	0.57	0.50	0.47	0.47	0.47	-
式（6）计算值	1.00	0.57	0.51	0.47	0.46	0.46	-
误差/%	0	0	-2.0	0	2.1	2.1	-

样品编号	滑移值/mm						残余滑移 / mm
样品编号	n=1	n=3	n=5	n=7	n=9	n=10	残余滑移 / mm
FC14⁃1	1.87	2.26	2.34	2.37	2.42	2.43	4.70
FC14⁃2	1.89	2.25	2.33	2.39	2.40	2.40	4.17
FC14⁃3	2.24	2.55	2.61	2.64	2.67	2.68	4.53
FC14⁃4	1.57	1.98	2.12	2.18	2.18	2.21	4.42
FC14⁃5	1.78	2.21	2.38	2.44	2.48	2.48	4.56
平均值	1.87	2.24	2.36	2.41	2.42	2.44	4.47
s_N /s₁	1.00	1.21	1.26	1.29	1.31	1.31	-
式（10）计算值	1.00	1.15	1.23	1.29	1.33	1.35	-
误差/%	0	5.0	2.4	0	-2.3	-3.1	-

样品编号	滑移值/mm						残余滑移 / mm
样品编号	n=1	n=3	n=5	n=7	n=9	n=10	残余滑移 / mm
FC14⁃1	1.87	2.26	2.34	2.37	2.42	2.43	4.70
FC14⁃2	1.89	2.25	2.33	2.39	2.40	2.40	4.17
FC14⁃3	2.24	2.55	2.61	2.64	2.67	2.68	4.53
FC14⁃4	1.57	1.98	2.12	2.18	2.18	2.21	4.42
FC14⁃5	1.78	2.21	2.38	2.44	2.48	2.48	4.56
平均值	1.87	2.24	2.36	2.41	2.42	2.44	4.47
s_N /s₁	1.00	1.21	1.26	1.29	1.31	1.31	-
式（10）计算值	1.00	1.15	1.23	1.29	1.33	1.35	-
误差/%	0	5.0	2.4	0	-2.3	-3.1	-

样品编号	滞回曲线面积/N/mm
样品编号	n=2	n=4	n=6	n=8	n=10
FC14⁃1	17.01	8.37	7.47	7.17	7.14
FC14⁃2	16.74	8.95	8.26	8.43	7.75
FC14⁃3	22.49	11.05	9.21	8.36	7.84
FC14⁃4	22.49	9.50	7.88	7.67	6.80
FC14⁃5	17.92	9.06	9.54	9.49	9.32
平均值	19.32	9.68	8.46	8.23	7.78
A_N /A₁	1.00	0.47	0.38	0.35	0.31
式（11）计算值	1.00	0.46	0.38	0.34	0.32
误差/%	0	2.1	0	2.9	-3.2