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

摘要/Abstract

摘要：

为研究CFRP筋粘结式锚固体系的界面失效演化机制，以锚具内倾角和锚固长度为变化参数，完成了9组CFRP筋粘结式锚具组装件的静载试验。结合试件的失效模式、筋材的磨损程度和加载端粘结-滑移全过程曲线，对CFRP筋粘结式锚固体系界面失效演化机制展开详细分析，从能量角度探讨了粘结界面能量耗散情况。运用灰色关联理论分析了各影响因素对粘结强度的敏感程度，通过数学拟合给出了粘结强度回归公式，并与现有计算模型进行了比较。研究表明：对于CFRP筋粘结式锚固体系，化学胶结力仅在加载初期起作用，界面粘结应力主要由摩擦力和机械咬合力承担；相对弹性变形能受锚固长度和锚具内倾角的影响不明显，相对局部破坏能主要受锚具内倾角影响；随着锚固长度的增大，试件弹性粘结强度、极限粘结强度和残余粘结强度均有所降低；随着锚具内倾角的增大，未发生剪切破坏的试件极限粘结强度有所增大，但弹性粘结强度和残余粘结强度的变化则不明显。灰色关联分析结果表明：各参数与粘结强度的关联度由大到小依次为CFRP筋根数>锚固长度>锚具内倾角>CFRP筋间距。本文粘结强度回归公式计算结果与试验结果吻合较好。

关键词: 桥梁工程, CFRP筋粘结式锚固体系, 界面粘结失效机制, 粘结强度, 锚固性能

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

中图分类号:

U444

陈华,陈耀嘉,谢斌,王鹏凯,邓朗妮. CFRP筋粘结式锚固体系界面失效演化机制及粘结强度计算[J]. 吉林大学学报(工学版), 2020, 50(5): 1698-1708.

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.

图/表 14

图1

表1

图2

图3

图4

图5

图6

表2

图7

图8

表3

相对弹性变形能和相对局部破坏能"

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

表3

图9

图10

表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

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