冲击作用下CFRP光圆筋与UHPC粘结性能的试验研究

蒋正文; 刘朋杰; 方志; 方亚威; 王志伟

doi:10.13801/j.cnki.fhclxb.20230612.002

冲击作用下CFRP光圆筋与UHPC粘结性能的试验研究

doi: 10.13801/j.cnki.fhclxb.20230612.002

蒋正文^{1, 2},
刘朋杰¹,
方志^{1, 2, ,},
方亚威¹,
王志伟³

1.
湖南大学　土木工程学院，长沙 410082
2.
湖南大学　风工程与桥梁工程湖南省重点实验室，长沙 410082
3.
中复碳芯电缆科技有限公司，连云港 222069

基金项目: 国家自然科学基金(52108210；51938012)；湖南省科技创新计划(省优秀博士后创新人才计划)(2021RC2062)；香江学者计划(XJ2022037)；中国博士后基金面上项目(2021M690968)

详细信息

通讯作者:
方志，博士，教授，博士生导师，研究方向为基于高性能材料工程结构的设计理论及工程应用技术　E-mail:fangzhi@hnu.edu.cn

中图分类号: U446.1；TB332
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出版历程
- 收稿日期: 2023-04-13
- 修回日期: 2023-05-14
- 录用日期: 2023-05-25
- 网络出版日期: 2023-06-13
- 刊出日期: 2024-02-01

Experimental study on bonding behavior between CFRP smooth bar and UHPC under impact loading

JIANG Zhengwen^{1, 2},
LIU Pengjie¹,
FANG Zhi^{1, 2
, ,},
FANG Yawei¹,
WANG Zhiwei³

1.
College of Civil Engineering, Hunan University, Changsha 410082, China
2.
Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, China
3.
Zhongfu Carbon Fiber Core Cable Technology CO. LTD., Lianyungang 222069, China

Funds: National Natural Science Foundation of China (52108210; 51938012); Science and Technology Innovation Program of Hunan Province (2021RC2062); Hong Kong Scholars Program (XJ2022037); China Postdoctoral Science Foundation (2021M690968)

摘要

摘要: 为明确冲击荷载作用下，碳纤维增强复合材料(Carbon fiber-reinforced polymer，CFRP)筋与超高性能混凝土(Ultra-high performance concrete，UHPC)粘结界面间化学粘结力和摩擦力的应变率效应，以锚固长度和荷载类型为参数，对8组共计24个采用UHPC作为粘结介质锚固的CFRP光圆筋试件(锚固长度分别为20d~35d，d为CFRP筋材直径)，分别进行了静力拉拔和筋材应变速率约为4.0 s⁻¹的纵向冲击试验。结果表明：静力和纵向冲击试件均发生了光圆筋拔出的滑移破坏，相较于冲击试件，静力加载后CFRP光圆筋的表面损伤更明显。冲击荷载作用下，CFRP光圆筋与UHPC间界面的化学粘结强度和峰值粘结强度均呈现正的应变率效应，分别较相应的静力强度提高了约53%和17%；而峰值后界面的残余粘结强度即滑动摩擦阻力则表现为负的应变率效应，较相应的静力值降低约38%。基于试验结果，建立了冲击作用下CFRP光圆筋与UHPC间界面动态粘结强度的预测公式。
- 碳纤维增强树脂复合材料(CFRP) /
- 超高性能混凝土(UHPC) /
- 冲击荷载 /
- 粘结强度 /
- 锚固长度
Abstract: To investigate effect of strain rate on chemical adhesion force and friction on the bonding interface between carbon fiber-reinforced polymer (CFRP) bars and ultra-high performance concrete (UHPC) under impact load, both static pull-out tests and longitudinal impact tests with the 4.0 s⁻¹ strain rate were conducted on UHPC-filled anchorage for CFRP smooth bars. Totally, 24 specimens for eight test groups with 20d-35d (d is CFRP bars diameter) embedded lengths were prepared. The results show that both static and longitudinal impact specimens fail in a similar pattern, that is, all CFRP bars slide out UHPC regardless of the embedded lengths and load types. However, the damage on the surface of CFRP bar is slightly severer in static tests than in impact tests. Under the impact, the chemical bond strength at the bonding interface between CFRP smooth bar and UHPC increases, thereby leading to an improved peak bond strength; however, the residual bonding strength (i.e., friction) at the bond interface decreases. Compared with the corresponding static test specimens, the chemical bond strength and peak bond strength approximately increase by 53% and 17%, respectively, while the average residual bonding strength decreases by about 38%. Besides, a prediction formula for predicting the dynamic bonding strength between CFRP smooth bar and UHPC under impact loads was established.
- carbon fiber-reinforced polymer (CFRP) /
- ultra-high performance concrete (UHPC) /
- impact loads /
- bond strength /
- embedment length

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图 1 试验所用碳纤维增强树脂复合材料(CFRP)光圆筋

Figure 1. Smooth carbon fiber reinforced polymers (CFRP) bar used in the tested

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图 2 静力拉拔及纵向冲击试件构造及尺寸

Figure 2. Configurations and dimensions of static tensile and longitudinal impact specimens

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图 3 静力试验装置

LVDT—Linear variable displacement transducer

Figure 3. Setup of static tensile tests

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图 4 纵向冲击试验装置

Figure 4. Setup of longitudinal impact tests

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图 5 滑移测点布置

Figure 5. Arrangement of slip measuring point

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图 6 CFRP光圆筋与UHPC粘结试件在静力和纵向冲击加载下的破坏形态

Figure 6. Typical failure modes of CFRP smooth bar and UHPC bonded specimens under static and impact loads

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图 7 冲击荷载作用下CFRP光圆筋与UHPC粘结试件的索力-时程曲线

Figure 7. Tension histories of CFRP smooth bar and UHPC bonded specimens under impact loading

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图 8 冲击荷载作用下CFRP光圆筋与UHPC粘结试件的滑移-时程曲线

Figure 8. Slip histories of CFRP smooth bar and UHPC bonded specimens under impact loading

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图 9 静力和冲击荷载作用下CFRP光圆筋与UHPC粘结试件的粘结应力-滑移曲线

Figure 9. Bond stress-slip curves of CFRP smooth bar and UHPC bonded specimens under static and impact loading

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图 10 锚固长度对CFRP光圆筋与UHPC粘结试件化学粘结强度的影响

Figure 10. Effect of embedded length on chemical bond strength of CFRP smooth bar and UHPC bonded specimens

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图 11 锚固长度对CFRP光圆筋与UHPC粘结试件峰值粘结强度的影响

Figure 11. Effect of embedded length on peak bond strength of CFRP smooth bar and UHPC bonded specimens

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图 12 锚固长度对CFRP光圆筋与UHPC粘结试件残余粘结强度的影响

Figure 12. Effect of embedded length on residual bond strength of CFRP smooth bar and UHPC bonded specimens

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图 13 锚固长度对CFRP光圆筋与UHPC粘结试件峰值点处滑移量的影响

Figure 13. Effect of embedded length on slip at maximum load of CFRP smooth bar and UHPC bonded specimens

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图 14 静力和纵向冲击荷载下CFRP光圆筋与UHPC粘结试件峰值索力对应滑移量的对比

Figure 14. Comparison of static and dynamic slip at maximum load between CFRP smooth bar and UHPC bonded specimens

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图 15 CFRP光圆筋与UHPC粘结静力试件峰值粘结强度试验值与预测值的比较

Figure 15. Comparison between the predicted and experimental of static peak bond strength of CFRP smooth bar and UHPC bonded specimens

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图 16 CFRP光圆筋与UHPC粘结冲击试件动态粘结强度试验值与预测值的比较

Figure 16. Comparison between the predicted and experimental of dynamic bond strength of CFRP smooth bar and UHPC bonded specimens

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表 1 超高性能混凝土(UHPC)的配合比

Table 1. Mix proportion of ultra-high performance concrete (UHPC)

Component	Cement	Silica fume	Quartz flour	Quartz sand	Water reducer	Water binder ratio
Mass ratio	1	0.25	0.25	1.1	0.02	0.22

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表 2 试件概况

Table 2. Overview of the test specimens

Specimen	Length of reliable anchorage /mm	Length of test anchorage /mm	Free length /mm	Length of specimens /mm
S-L160	500	160	300	1000
S-L200	500	200	300	1040
S-L240	500	240	300	1080
S-L280	500	280	300	1120
D-L160	Wedge type	160	300	680
D-L200		200	300	720
D-L240		240	300	760
D-L280		280	300	800
Notes: In specimen codes, the first letter indicates the test type (S—Static tensile test; D—Dynamic impact test), and the second letter is used to differentiate the anchorage length (160 to 280 mm denoted by L160 to L280). For example, D-L160 means the impact specimen with a bond length of 160 mm.

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表 3 CFRP光圆筋与UHPC粘结试件静力和冲击试验主要结果

Table 3. Typical results of static and impact tests on CFRP smooth bar and UHPC bonded specimens

Specimen	$\acute{\varepsilon} $/s⁻¹	$\bar{\acute{\varepsilon} }$/s⁻¹	T_max/kN	${\bar T_{\max }} $/kN	${\bar \tau _{\rm{m}}} $/MPa	${\bar \tau _{\rm{a}}} $/MPa	${\bar \tau _{\rm{r}}} $/MPa	S₀/mm	${\bar S_0} $/mm	${\bar S_{\textit{z}}} $/mm
S-L160-1	—	—	12.35	11.96	2.98	1.24	2.52	0.56	0.46	0.48
S-L160-2			11.61					0.37
S-L160-3			11.93					0.46
S-L200-1	—	—	14.29	14.72	2.93	1.20	2.50	0.49	0.53	0.56
S-L200-2			15.13					0.50
S-L200-3			14.75					0.60
S-L240-1	—	—	17.74	17.30	2.87	1.21	2.50	0.65	0.61	0.65
S-L240-2			17.23					0.61
S-L240-3			16.94					0.58
S-L280-1	—	—	18.56	19.57	2.78	1.16	2.49	0.64	0.68	0.72
S-L280-2			19.73					0.66
S-L280-3			20.42					0.75
D-L160-1	3.44	3.65	14.30	13.96	3.47	1.93	1.60	0.97	0.83	—
D-L160-2	3.67		13.93					0.77
D-L160-3	3.83		13.64					0.76
D-L200-1	3.95	3.70	16.13	17.06	3.40	1.87	1.58	0.85	0.91	—
D-L200-2	3.29		17.15					0.89
D-L200-3	3.85		17.90					0.99
D-L240-1	3.93	3.84	21.21	20.31	3.37	1.79	1.55	1.10	1.01	—
D-L240-2	3.89		19.19					0.96
D-L240-3	3.71		20.54					0.98
D-L280-1	4.42	4.06	23.40	23.48	3.34	1.76	1.52	1.06	1.08	—
D-L280-2	3.86		22.46					1.03
D-L280-3	3.91		24.58					1.14
Notes: $\acute{\varepsilon} $, T_max, S₀—Strain rate, maximum load, slip of specimen corresponding to the maximum load, respectively; $ \bar{\acute{\varepsilon} } $, ${\bar T_{\max }} $, ${\bar \tau _{\rm{m}}} $, ${\bar \tau _{\rm{a}}} $, ${\bar \tau _{\rm{r}}} $, ${\bar S _{0}} $, ${\bar S_{\textit{z}}}$—Average value of the strain rate, maximum load, peak bond strength, chemical bond strength, residual bond strength, slip of specimen corresponding to the maximum load, slip of loading end corresponding the free end start slip, respectively.

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表 4 CFRP光圆筋与UHPC粘结试件静、动态化学粘结强度对比

Table 4. Comparison of static and dynamic chemical bond strength between CFRP smooth bar and UHPC bonded specimens

Embedded length /mm	τ_s,a /MPa	τ_d,a /MPa	τ_d,a/τ_s,a
160	1.24	1.93	1.56
200	1.20	1.87	1.56
240	1.21	1.79	1.48
280	1.16	1.76	1.52
Average	1.20	1.84	1.53
Note: τ_s,a, τ_d,a—Static and dynamic chemical bond strength, respectively.

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表 5 CFRP光圆筋与UHPC粘结试件静、动态峰值粘结强度对比

Table 5. Comparison of static and dynamic peak bond strength between CFRP smooth bar and UHPC bonded specimens

Embedded length /mm	τ_s,m /MPa	τ_d,m /MPa	τ_d,m/τ_s,m
160	2.98	3.47	1.16
200	2.93	3.40	1.16
240	2.87	3.37	1.17
280	2.78	3.34	1.20
Average	2.89	3.39	1.17
Note: τ_s,m, τ_d,m—Static and dynamic peak bond strength, respectively.

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表 6 CFRP光圆筋与UHPC粘结试件静、动态残余粘结强度对比

Table 6. Comparison of static and dynamic residual bond strength between CFRP smooth bar and UHPC bonded specimens

Embedded length /mm	τ_s,r /MPa	τ_d,r /MPa	τ_d,r/τ_s,r
160	2.52	1.60	0.63
200	2.50	1.58	0.63
240	2.50	1.55	0.62
280	2.49	1.52	0.61
Average	2.50	1.56	0.62
Note: τ_s,r, τ_d,r—Static residual bond strength and dynamic residual bond strength, respectively.

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