低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响

朱德举; 唐昊

低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响

朱德举^,,
唐昊

湖南大学　土木工程学院绿色先进土木工程材料及应用技术湖南省重点实验室, 长沙 410082

基金项目: 国家自然科学基金山东联合基金项目(U1806225)

详细信息

通讯作者:
朱德举，博士，教授，博士生导师，研究方向为生物材料多尺度力学行为及仿生、高性能纤维/织物增强水泥基和树脂基复合材料、防弹高性能纤维布的力学特性和有限元分析、冲击和高应变率试验技术　E-mail: dzhu@hnu.edu.cn

中图分类号: TB332;TU599
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- 被引次数: 0
出版历程
- 收稿日期: 2022-12-15
- 修回日期: 2023-01-15
- 录用日期: 2023-02-11
- 网络出版日期: 2023-02-28

Influence of short steel fiber on mechanical properties of carbon textile reinforced concrete under low-cycle fatigue loading

Deju ZHU^,,
Hao TANG

Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China

Funds: National Natural Science Foundation of China-Shandong Joint Fund (U1806225)

摘要

摘要: 为了研究低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土(C-TRC)力学性能的影响，通过万能试验机对不同短切钢纤维掺量(0vol%、0.5vol%、1.0vol%)的试件进行低次数疲劳加载实验和疲劳加载前后的准静态拉伸试验，并结合数字图像相关分析得到拉伸状态下裂纹与应变分布。结果表明：添加短切钢纤维能够增大C-TRC的拉伸强度、杨氏模量和韧性，降低试件的能量耗散以及剩余累积应变，增加裂纹条数和裂纹宽度。疲劳荷载能够降低C-TRC的刚度、极限强度、峰值应变以及韧性，加快C-TRC的破坏。添加短切纤维能够降低疲劳加载造成的性能损耗，且0.5vol%掺量的增强效果最佳。基于现有的剩余强度-剩余刚度关联模型和实验数据，改进了强度退化模型，对实验数据进行拟合并与现有模型进行对比，其结果与实验数据吻合更好。该成果对于TRC疲劳性能的评价具有指导意义。
- 碳纤维织物 /
- 短切钢纤维 /
- 拉伸试验 /
- 疲劳加载 /
- 织物增强混凝土
Abstract: In order to study the influence of the short steel fiber on the mechanical properties of carbon textile reinforced concrete (C-TRC) under low-cycle fatigue loading, low-cycle fatigue loading test and quasi-static tensile tests before and after fatigue loading were conducted on specimens with various contents of short steel fiber (0vol%, 0.5vol% and 1.0vol%) by a universal testing machine, and distributions of crack and strain were obtained by digital image correlation (DIC) method. The results show that the addition of short steel fiber can increase the tensile strength, the Young’s modulus and toughness of C-TRC, reduce the energy dissipation and residual accumulated strain and increase the crack number and crack width. Fatigue load can reduce the rigidity, tensile strength, peak strain, and toughness, and accelerate the destruction of C-TRC. The addition of short steel fiber can reduce the property degradation caused by fatigue loading, and the 0.5vol% addition has the best enhancement effect. The strength degradation model was modified based on the existing residual strength-residual stiffness coupled model and experimental data, fit the experimental data, and was compared with the existing model, which shows better consistency with the experimental data. The findings will be available for the fatigue performance evaluation of TRC.
- carbon textile /
- short steel fiber /
- tensile test /
- fatigue loading /
- TRC

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图 1 碳纤维织物

Figure 1. Carbon textile

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图 2 短切钢纤维

Figure 2. Short steel fiber

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图 3 球铰连接的拉伸夹具

Figure 3. Tensile fixture connected by ball joint

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图 4 待测C-TRC拉伸试件

Figure 4. Tensile specimen of C-TRC to be tested

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图 5 疲劳荷载谱

Figure 5. Fatigue load spectrum

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图 6 低次数疲劳加载作用下C-TRC拉伸应力-应变曲线

Figure 6. Tensile stress-strain curves of C-TRC subjected to low-cycle fatigue loading

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图 7 低次数疲劳加载作用下C-TRC疲劳力学性能变化

Figure 7. Variations in fatigue mechanical properties of C-TRC subjected to low-cycle fatigue loading

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图 8 低次数疲劳加载作用下C-TRC主裂纹宽度变化

Figure 8. Variations in width of the major crack of C-TRC subjected to low-cycle fatigue loading

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图 9 短切钢纤维掺量对C-TRC裂纹宽度影响(第100次循环)

Figure 9. Influence of short steel fiber contents on crack width of C-TRC (100^th cycle)

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图 10 C-TRC裂纹宽度对比(第100次循环)

Figure 10. Comparison of the crack width of C-TRC (100^th cycle)

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图 11 低次数疲劳加载作用下C-TRC裂纹宽度的M-K检验对比

Figure 11. Comparison of the M-K test results of the crack width of C-TRC subjected to low-cycle fatigue loading

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图 12 短切钢纤维掺量对C-TRC疲劳性能的影响(第100次循环)

Figure 12. Influence of short steel fiber contents on fatigue properties of C-TRC (100^th cycle)

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图 13 C-TRC拉伸应力-应变曲线

Figure 13. Tensile stress-strain curves of C-TRC

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图 14 C-TRC疲劳加载前后拉伸力学性能对比

Figure 14. Comparison of the tensile mechanical properties of C-TRC before and after fatigue loading

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图 15 C-TRC剩余强度和剩余刚度的理论与试验结果对比

Figure 15. Comparison of theoretical and experimental results of the residual strength and residual rigidity of C-TRC

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图 16 不同短切钢纤维掺量的C-TRC裂纹和应变分布

Figure 16. Crack and strain distribution of C-TRC with various contents of short steel fiber

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图 17 C-TRC典型破坏形态

Figure 17. Typical failure modes of C-TRC

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图 18 不同短切钢纤维掺量的C-TRC疲劳加载前后的裂纹数量和平均裂纹间距

Figure 18. Crack number and average crack spacing of C-TRC with various contents of short steel fiber before and after fatigue loading

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图 19 疲劳加载后C-TRC的破坏形态

Figure 19. Failure patterns of C-TRC after fatigue loading

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表 1 基体配合比设计

Table 1. Mix design of the matrix kg/m³

Cement (P.O 42.5)	Fly ash	Silica fume	Sand (0-0.6 mm)	Sand (0.6-1.2 mm)	Superplasticizer	Water	Defoamer
712	303	65	450	901	4.4	330	2.6

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表 3 短切钢纤维性能参数

Table 3. Performance parameters of short steel fiber

Diameter/mm	Length/ mm	Tensile strength /MPa	Young’s modulus /GPa	Density / (g·cm⁻³)
0.20	6-8	3015	200	7.8

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表 2 碳纤维织物性能参数

Table 2. Performance parameters of carbon textile

Model	Textile size	Tex/ (g·(1000 m)⁻¹)	Grammage>/ (g·cm⁻²)	Coating	Section area of single yarn/mm²		Tensile strength of single yarn/MPa		Young’s modulus of single yarn/GPa
Model	Textile size	Tex/ (g·(1000 m)⁻¹)	Grammage>/ (g·cm⁻²)	Coating	Warp	Weft	Warp	Weft	Warp	Weft
TC33-3 K	5×5 mm	270-320	1.8	Epoxy resin	0.18	0.16	3450	3100	238	216

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表 4 C-TRC拉伸实验分组

Table 4. Experimental grouping for tensile tests of C-TRC

Specimen ID	Textile	Layers of textile	${V_{\text{f}}}$ /vol%
Q0%CT/C	Carbon	2	0
Q0.5%CT/C	Carbon	2	0.5
Q1.0%CT/C	Carbon	2	1
Notes: Q represents the quasi-static tensile tests; 0%, 0.5%, 1.0% represent that the contents of short steel fiber are 0 vol%, 0.5 vol% and 1.0 vol%; CT represents the carbon textile; C represents the concrete; ${V_{\text{f}}}$is the volume fraction of carbon textile.

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表 5 C-TRC低次数疲劳加载试验分组

Table 5. Experimental grouping for low-cycle fatigue loading tests of C-TRC

Specimen ID	Textile	Layers of textile	${V_{\text{f}}}$ /vol%	Cycles	Stress level /%
L0%CT/C	Carbon	2	0	100	5-60
L0.5%CT/C	Carbon	2	0.5	100	5-60
L1.0%CT/C	Carbon	2	1	100	5-60
Notes: L represents the low-cycle fatigue loading test.

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表 6 不同短切钢纤维掺量的C-TRC的疲劳性能参数(第100次循环)

Table 6. Fatigue properties parameters of C-TRC with various contents of short steel fiber (100^th cycle)

Specimen ID	$ {E}_{+} $ /GPa	$ {E}_{-} $ /GPa	$ {E}_{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{s}} $ /10^-4J	$ {B}_{i} $ /%
L0%CT/C	2.04	2.04	590	0.533
L0.5%CT/C	2.18	2.18	453	0.493
L1.0%CT/C	2.10	2.11	475	0.513
Notes: $ {E}_{+} $ and $ {E}_{-} $ are the upward Young’s modulus and downward Young’s modulus; $ {E}_{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{s}} $ is the dissipated energy; $ {B}_{i} $ is the accumulated strain.

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表 7 不同短切钢纤维掺量的C-TRC的主裂纹出现时间和出现位置

Table 7. Occurrence time and location of major crack of C-TRC with various contents of short steel fiber

Specimen ID	NO.1		NO.2		NO.3
Specimen ID	Occurrence time	Location /mm	Occurrence time	Location /mm	Occurrence time	Location /mm
L0%CT/C	Before fatigue loading	43	Before fatigue loading	36	Before fatigue loading	42
L0.5%CT/C	Before fatigue loading	43	8 th cycle	44	Before fatigue loading	44
L1.0%CT/C	Before fatigue loading	36	Before fatigue loading	15	16 th cycle	18

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表 8 疲劳加载前后的C-TRC的拉伸力学性能试验结果

Table 8. Test results of the tensile mechanical properties of C-TRC before and after fatigue loading

Specimen ID	Rigidity/ GPa	Reduction rate/%	Tensile strength/MPa	Tensileload/ kN	Reduction rate/%	Ultimate strain/%	Reduction rate/%	Toughness/ (kJ·m⁻³)	Reduction rate/%
Q0%CT/C	24.4		11.2	5.04		1.23		87.78
Q0.5%CT/C	24.6		12.9	5.81		1.40		106.89
Q1.0%CT/C	22.3		14.2	6.39		1.37		110.67
L0%CT/C	1.07	95.6	9.15	4.12	18.2	0.84	32.0	38	56.8
L0.5%CT/C	1.75	92.9	11.4	5.13	11.8	1.13	19.3	66.67	37.7
L1.0%CT/C	1.14	94.9	11.3	5.09	20.5	0.99	28.0	51.56	53.4

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表 9 未添加短切钢纤维时TRC的剩余刚度-剩余强度关联模型参数与拟合结果

Table 9. Parameters of the residual strength-residual stiffness coupled model of C-TRC without short steel fiber and fitted results

Cycles	Eq. (8)		R²	Eq. (9)			R²
Cycles	$ q $	$ w $	R²	$ r $	$ a $	$ H $	R²
100	0.0012	12.4	0.93	0.61	0.04	0.68	0.94
200	0.0014	14.1	0.95	0.74	0.07	0.54	0.93
Average value	0.0013	13.3		0.68	0.06	0.61

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表 10 不同加载次数下的C-TRC的剩余强度和剩余刚度

Table 10. Residual strength and residual rigidity of C-TRC subjected to various loading cycles

Stress level (%)	Cycles	NO.1		NO.2		NO.3
Stress level (%)	Cycles	S_r/ S₀ /%	E_r/E₀ /%	S_r/S₀ /%	E_r/E₀ /%	S_r/S₀ /%	E_r/E₀ /%
5-60	100	82.4	3.1	86.6	4.1	85.3	4.1
	200	81.7	4.7	88.4	4.1	79.6	4.4
	300	82.3	5.4	79.4	4.5	81.7	4.9
	500	79.4	4.2	77.6	3.6	78.3	4.2
Notes: S_r and S₀ are the residual strength and initial strength; E_r and E₀ are the residual stiffness and initial stiffness.

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