CFRP筋粘结式锚固体系界面失效演化机制及粘结强度计算

doi:10.13229/j.cnki.jdxbgxb20190621

Abstract

Abstract:

To investigate the interface failure mechanism between CFRP tendon and epoxy mortar in the bond-type anchorage system, a total 9 specimens were designed for static load test. Two parameters were considered in the test, anchorage length and the internal inclination of anchorage. The failure mode of the specimens, the wear degree of CFRP tendon and load-slip curve in the loading end of specimens were obtained. The interface failure mechanism between CFRP tendon and epoxy mortar in the bond-type anchorage system was described in detail. The energy dissipation in the bonding interface was investigated. The grey relational theory was applied to investigate the sensitivity of parameters on bond strength. Based on the testing data, the regression formula of bond strength was fitted and compared with other existing formulas. The results show that the chemical bonding force only plays a limited role in the initial loading stage, and the interface bonding stress is mainly borne by the friction force and the mechanical bite force. The anchorage length and the internal inclination of anchorage have no obvious effect on the relative elastic deformation energy, but the relative local failure energy is mainly affected by the internal inclination of anchorage. The elastic bond strength, ultimate bond strength and residual bond strength all decrease with the anchorage length. With the increase in the inner inclination angle of the anchorage, the ultimate bond strength of the specimens without shear failure increases to a certain extent, but the elastic bond strength and residual bond strength change irregularly. The results of grey correlation analysis show that the correlation degree of each parameter in the order from large to small are the number of CFRP tendons, anchorage length, the internal inclination of anchorage and the spacing of CFRP tendons. A practical formula for calculating bond strength is derived and the calculated results are in good agreement with the experimental results.

Key words: bridge engineering, bond-type anchorage system for carbon fiber-reinforced plastics tendon, mechanism of bond failure, bond strength, anchorage property

CLC Number:

U444

Hua CHEN,Yao-jia CHEN,Bin XIE,Peng-kai WANG,Lang-ni DENG. Interface failure mechanism and bonding strength calculation of CFRP tendons bonded anchorage system[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(5): 1698-1708.

Figures/Tables 14

Fig.1

Table 1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 2

Fig.7

Fig.8

Table 3

Relative value of elastic deformation energy and relative value of partial destruction energy"

项目	BTA1	BTA2	BTA3	BTA4	BTA6	BTA7	BTA9
$U 0 s'$	0.80	1.30	0.88	0.17	0.32	0.80	0.38
$U f'$	0.87	0.79	0.59	1.48	0.37	1.46	1.45

Table 3

Fig.9

Fig.10

Table 4

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试件编号	l/mm	α/（°）	l'/mm	D/mm	R₁/mm	R₂/mm
BTA1	80	2	132	26.58	11	16.58
BTA2	100	2	152	27.98	11	17.98
BTA3	150	2	202	31.47	11	21.47
BTA4	80	3	132	29.38	11	19.38
BTA5	100	3	152	31.48	11	21.48
BTA6	150	3	202	36.72	11	26.72
BTA7	80	4	132	32.19	11	22.19
BTA8	100	4	152	34.98	11	24.98
BTA9	150	4	202	41.97	11	31.97

试件编号	P_e/kN	P_u/kN	P_r/ kN	τ_e/MPa	τ_u/MPa	τ_r/MPa	s_e/mm	s_u/mm	s_r/mm
BTA1	9.00	28.20	9.80	5.97	18.71	6.50	0.06	2.33	2.53
BTA2	10.00	36.40	9.60	5.31	19.32	5.60	0.11	2.63	2.84
BTA3	8.00	39.40	14.40	2.83	13.94	5.10	0.14	2.96	3.59
BTA4	5.80	29.40	10.20	3.85	19.51	6.77	0.02	2.75	2.91
BTA6	8.00	61.40	10.56	2.83	21.73	3.74	0.05	4.77	3.65
BTA7	9.00	30.20	9.80	5.97	20.04	6.50	0.06	4.35	4.45
BTA8	8.00	42.20	11.28	4.25	22.40	5.99	0.04	3.72	5.18
BTA9	8.88	30.00	9.88	3.14	10.62	3.50	0.48	―	―

试件编号	τ_u,t/MPa	τ_u,4/MPa	τ_u,4/τ_u,t	τ_u,9/MPa	τ_u,9/τ_u,t	τ_u,10/MPa	τ_u,10/τ_u,t	τ_u,18/MPa	τ_u,18/τ_u,t	τ_u,0/MPa	τ_u,0/τ_u,t
BTA1	18.70	17.60	0.94	13.46	0.72	9.19	0.49	13.03	0.70	18.13	0.97
BTA2	19.30	19.19	0.99	14.27	0.74	10.14	0.53	15.20	0.79	17.70	0.92
BTA3	13.93	23.17	1.66	16.30	1.16	12.49	0.89	20.63	1.47	16.63	1.19
BTA4	19.50	18.40	0.94	14.18	0.73	9.19	0.47	13.03	0.67	21.50	1.10
BTA5	21.67	20.07	1.03	15.04	0.77	10.14	0.52	15.20	0.78	21.07	1.08
BTA6	21.72	24.23	1.12	17.17	0.79	12.49	0.58	20.63	0.95	20.00	0.92
BTA7	20.03	19.20	0.96	14.90	0.74	9.19	0.46	13.03	0.65	20.77	1.04
BTA8	22.40	20.94	0.93	15.80	0.71	10.14	0.45	15.20	0.68	19.20	0.86
BTA9	10.60	25.28	2.39	18.04	1.70	12.49	1.18	20.63	1.95	13.83	1.30
均值	18.65	20.90	1.22	15.46	0.90	10.61	0.62	16.29	0.96	18.76	1.04

Interface failure mechanism and bonding strength calculation of CFRP tendons bonded anchorage system

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