CFRP全覆盖胶粘加固含中心裂纹钢板的静力性能

陈卓异; 彭岚; 李传习; 彭彦泽

doi:10.13801/j.cnki.fhclxb.20210622.005

CFRP全覆盖胶粘加固含中心裂纹钢板的静力性能

doi: 10.13801/j.cnki.fhclxb.20210622.005

长沙理工大学　桥梁工程安全控制教育部重点实验室，长沙 410114

基金项目: 国家自然科学基金(51708047；51778069)；湖南省自然科学基金(2019JJ50670)；重点学科创新性项目(18ZDXK11)；湖南省教育厅优秀青年项目(19B013)

详细信息

通讯作者:
陈卓异，博士，副教授，研究生导师，研究方向为桥梁结构新材料、新结构　E-mail：814177024@qq.com

中图分类号: TB332
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出版历程
- 收稿日期: 2021-04-20
- 修回日期: 2021-06-07
- 录用日期: 2021-06-11
- 网络出版日期: 2021-06-22
- 刊出日期: 2022-03-23

Static behavior of CFRP full cover adjusted steel plate with center crack

Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, Changsha 410114, China

摘要

摘要: 碳纤维增强树脂复合材料(CFRP)加固钢板时，往往只将CFRP粘贴于钢板的局部，容易遭受由于试件偏心和搭接边缘应力集中所产生的剥离应力的影响，而粘贴方式采用全覆盖时能大幅度减小剥离应力。开展了30个CFRP全覆盖胶粘加固带缺陷钢板的轴向拉伸试验，并设置了单向防剥离夹具，研究了胶粘剂类型、缺陷长度和碳纤维板厚度对加固效果及破坏模式的影响。结果表明：CFRP板加固效果显著，试件的抗拉强度明显提高；不同胶粘剂对试件的破坏模式影响较大，由HJY胶制作的试件主要为被粘物的破坏，而SIKA30胶及WSB胶均出现了胶粘剂/钢脱粘的现象；而随着缺陷长度的增加，破坏模式有明显的变化，由CFRP板破坏变为CFRP板、钢板破坏或胶粘剂/钢脱粘，而试件的抗拉强度受胶粘剂类型影响较小，受缺陷的大小影响较大，当缺陷增大时，试件的抗拉强度明显降低；基于内聚力模型对静力力学试验进行了数值模拟；通过有限元分析得知，胶粘剂的破坏是先由缺陷附近破坏，再扩展至两端；而增加CFRP板的厚度能显著提高试件的抗拉强度。
- 碳纤维增强树脂复合材料 /
- 加固 /
- 全覆盖 /
- 数值模拟 /
- 参数分析
Abstract: When carbon fiber reinforced polymer (CFRP) is used to strengthen steel plate, CFRP is usually only adhered to the local part of the steel plate, which is susceptible to the influence of the peeling stress caused by the eccentricity of the specimen and the stress concentration at the lap edge. However, the peeling stress can be greatly reduced by using the full covering bonding method. The axial tensile tests of 30 CFRP reinforced steel plates with defects were carried out, and the unidirectional anti-stripping clamp was set up. The effects of adhesive type, defect length and thickness of carbon fiber plate on the reinforcement effect and failure mode were studied. The results show that the reinforcement effect of CFRP plate is significant, and the tensile strength of the specimen is signifi-cantly improved. Different adhesives have a great influence on the failure mode of the specimen. The specimen made of HJY adhesive is mainly destroyed by the adhesive, while the debonding phenomenon of the adhesive/steel appears in both Sika30 adhesive and WSB adhesive. With the increase of the defect length, the failure mode changes from the failure of CFRP plate to the failure of CFRP plate, steel plate or adhesive/steel debonding. The tensile strength of the specimen is less affected by the type of adhesive, but more affected by the size of the defect. When the defect increases, the tensile strength of the specimen decreases significantly. Based on the cohesive force model, the static mechanical tests were numerically simulated. The finite element analysis shows that the damage of adhesive starts from near the defect and then extends to both ends. However, increasing the thickness of CFRP plate can significantly increase the tensile strength of the specimen.
- carbon fiber reinforced polymer /
- reinforcement /
- full coverage /
- numerical simulation /
- parameter analysis

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图 1 CFRP加固带缺陷钢板的几何尺寸、应变片布置、夹具尺寸及缺陷形状

Figure 1. Geometric dimensions, strain gage arrangement, clamp dimensions and flaw shapes of CFRP reinforced steel plates with flaw

L—Strain measuring length; l_n—Length of flaw; t_f—Thickness of CFRP plate

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图 2 试验加载装置

Figure 2. Test loading device

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图 3 CFRP加固带缺陷钢板试件破坏模式

Figure 3. Failure mode of CFRP strengthened steel plate specimen with defects

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图 4 CFRP加固带缺陷钢板的荷载-位移曲线

Figure 4. Load-displacement curves of CFRP strengthened steel plate with defects

C-i—Defect length was i mm in the control group

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图 5 CFRP板表面应变分布

Figure 5. Surface strain distribution of CFRP plate

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图 6 CFRP数值模拟应变与试验应变对比

Figure 6. Comparison of CFRP strain simulation and test strain

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图 7 胶粘剂刚度退化过程

Figure 7. Adhesive stiffness degradation process

SDEG—Stiffness degradation rate

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图 8 五种厚度CFRP加固带缺陷钢板荷载-位移曲线

Figure 8. Load-displacement curves of five types of plate with defects strengthened with CFRP

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表 1 碳纤维增强聚合物复合材料(CFRP)板、钢材及胶粘剂材料参数

Table 1. Material parameters of carbon fiber reinforced polymer composite (CFRP) plate, steel and adhesive

Types of materials	Tensile strength/MPa	Modulus of elasticity/GPa	Elongation at break/%
CFRP plate	1800	161.2	1.1
Q345qD steel plate	514	206	18
HJY glue	34.0	4.10	0.86
SIKA30 glue	25.3	12.13	0.22
WSB glue	41.8	2.7	1.5

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表 2 CFRP加固带缺陷钢板试件参数及试验结果

Table 2. Parameters and test results of CFRP strengthened steel plate with defects

Adhesive type	Specimen number	Limit displacement/mm	Average displacement/mm	Ultimate load/kN	Average load/kN	Failure mode
HJY glue	CFRP-HJY-SP(L2)-1	10.75	10.87	259.19	247.71	a
	CFRP-HJY-SP(L2)-2	11.10		231.14		a
	CFRP-HJY-SP(L2)-3	10.75		252.81		a
	CFRP-HJY-SP(L3)-1	7.06	7.06	252.80	240.40	a
	CFRP-HJY-SP(L3)-2	7.06		223.00		a+b
	CFRP-HJY-SP(L3)-3	7.06		245.39		a
	CFRP-HJY-SP(L4)-1	6.54	6.49	190.50	187.92	a+b
	CFRP-HJY-SP(L4)-2	6.60		183.97		a+b
	CFRP-HJY-SP(L4)-3	6.34		189.28		a+b
SIKA30 glue	CFRP-SIKA30-SP(L2)-1	18.98	18.75	238.37	240.53	a+c
	CFRP-SIKA30-SP(L2)-2	21.45		246.94		a+c
	CFRP-SIKA30-SP(L2)-3	15.83		236.28		a+c
	CFRP-SIKA30-SP(L3)-1	7.79	6.71	235.85	219.27	a+b
	CFRP-SIKA30-SP(L3)-2	5.19		197.33		a+c
	CFRP-SIKA30-SP(L3)-3	7.16		224.63		a+b
	CFRP-SIKA30-SP(L4)-1	4.54	3.27	193.51	159.98	a+c
	CFRP-SIKA30-SP(L4)-2	2.73		149.56		a+c
	CFRP-SIKA30-SP(L4)-3	2.54		136.88		a+c
WSB glue	CFRP-WSB-SP(L2)-1	15.26	11.33	246.51	232.53	b+c
	CFRP-WSB-SP(L2)-2	5.69		234.12		c+d
	CFRP-WSB-SP(L2)-3	13.05		216.96		c+d
	CFRP-WSB-SP(L3)-1	10.17	8.37	206.47	206.24	a+b+c
	CFRP-WSB-SP(L3)-2	8.77		211.82		a+b+c
	CFRP-WSB-SP(L3)-3	6.18		200.43		a+b+c
	CFRP-WSB-SP(L4)-1	7.09	6.85	185.69	181.52	a+b+c
	CFRP-WSB-SP(L4)-2	6.68		178.62		a+b+c
	CFRP-WSB-SP(L4)-3	6.79		180.25		a+b+c
Notes: Naming rules of specimens "*---* *" : The first line of numbers represents the composite material name; The second row of numbers represents the type of adhesive; The third line indicates the defect length; The fourth line number represents the specimen number; a—CFRP plate failure; b—Steel plate damage; c—Steel/adhesive debonding; d—CFRP board/adhesive damage.

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表 3 五种CFRP厚度对应的CFRP加固带缺陷钢板极限荷载

Table 3. Ultimate load of plate with defects strengthened with CFRP corresponding to the five thickness of CFRP

Thickness/mm	0.7	1.05	1.4	1.75	2.1
Ultimate load/kN	173	221	280	323	377
Ratio	0.62	0.79	1	1.15	1.35

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