低轴压比聚乙烯醇纤维增强水泥基复合材料中长柱抗震性能试验

王玉清; 解春燕; 刘曙光; 徐向阳; 孟苏牙拉吐

doi:10.13801/j.cnki.fhclxb.20210310.001

低轴压比聚乙烯醇纤维增强水泥基复合材料中长柱抗震性能试验

doi: 10.13801/j.cnki.fhclxb.20210310.001

1.
内蒙古工业大学　土木工程学院，呼和浩特 010051
2.
内蒙古工业大学　矿业学院，呼和浩特 010051
3.
国核电力规划设计研究院，北京 100095

基金项目: 国家自然科学基金(51768051)；内蒙古自治区科技创新引导项目(KCBJ2018016)；内蒙古自治区自然科学基金(2018LH05040)

详细信息

通讯作者:
刘曙光，硕士，教授，研究方向为高性能纤维水泥基复合材料的工程应用　E-mail：liusg6011@126.com

中图分类号: TU525.9
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出版历程
- 收稿日期: 2021-01-11
- 录用日期: 2021-03-01
- 网络出版日期: 2021-03-10
- 刊出日期: 2021-12-01

Experimental study on seismic performance of polyvinyl alcohol fiber reinforced cementitious composite medium-length columns with low axial pressure ratio

1.
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2.
School of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China
3.
National Nuclear Power Planning and Design Institute, Beijing 100095, China

摘要

摘要: 已有对聚乙烯醇纤维增强水泥基复合材料(PVA/C)柱抗震性能的研究大多针对短柱，且PVA/C一般只在节点及其邻近部位局部设置。基于此，本文对低轴压比且沿柱全高设置的PVA/C中长柱进行低周反复荷载试验，变化参数为纤维体积分数ρ_f和体积配箍率ρ_v。通过试验，得出以下结论：所有试件均发生弯曲破坏；当ρ_f和ρ_v分别在试验设计范围内增大时，试件的裂缝控制能力、延性、截面转动能力及耗能能力均提高，刚度退化及承载力衰减速度减小；ρ_f的增大可较大程度提高试件开裂荷载，而对峰值荷载影响较小；ρ_f由0 vol%提高到2 vol%，位移延性系数、耗能比及开裂荷载分别提高52.9%、112.3%和51.1%；掺加适量纤维后，即使降低配箍率，试件也可保持良好的抗震性能和裂缝形态。根据本文试验数据并收集其他相关文献试验数据，拟合得出位移延性系数与ρ_f和ρ_v之间的关系式。最后总结了各类PVA/C柱抗震性能差异。
- PVA/C /
- 抗震性能 /
- 中长柱 /
- 低轴压比 /
- 纤维体积分数 /
- 配箍率
Abstract: Previous studies on the seismic performance of polyvinyl alcohol fiber reinforced cementitious compo-site (PVA/C) columns mostly focused on short columns, and PVA/C was usually set locally in the joint and its adjacent parts. Based on this, low-cycle reversed loading tests on medium-length PVA/C columns with low axial pressure ratio were carried out, and PVA/C was set along the full height of the column. Test variation parameters are fiber volume fraction ρ_f and volume-stirrup ratio ρ_v. The following conclusions can be drawn through the test: Bending failure occurs in all specimens. When ρ_f and ρ_v increase within the test condition range respectively, the crack controlling ability, ductility, section rotation ability and energy dissipation ability of specimens are improved. While the rate of stiffness degradation and decay of bearing capacity are decreased. The increase of ρ_f can greatly improve the cracking load of specimens, but has little effect on the peak load. When ρ_f increases from 0 vol% to 2 vol%, the displacement ductility coefficient, the energy consumption ratio and the cracking load increase 52.9%, 112.3% and 51.1%, respectively. The PVA/C columns can maintain good seismic performance and crack morphology even if the stirrup ratio is reduced. According to the experimental data of this paper and other relevant literature, the relationship between displacement ductility coefficient and ρ_f and ρ_v is obtained. Differences of seismic performance of various PVA/C columns were summarized.
- polyvinyl alcohol fiber reinforced cementitious composite (PVA/C) /
- seismic performance /
- medium-length column /
- low axial pressure ratio /
- fiber volume fraction /
- stirrup ratio

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图 1 聚乙烯醇纤维增强水泥基复合材料(PVA/C)试件设计及配筋图

Figure 1. Polyvinyl alcohol fiber reinforced cementitious composite (PVA/C) specimen design and reinforcement

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图 2 加载装置示意图

Figure 2. Loading device schematic

1—Reaction wall; 2—Positive electrode method; 3—Sliding axle; 4—Vertical loading apparatus; 5—Level sensor; 6—Anchor bolt; 7—Steel plate

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图 3 钢筋应变片

Figure 3. Strain gauges of rebar

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图 4 加载制度

Figure 4. Loading system

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图 5 PVA/C试件破坏形态

Figure 5. Failure patterns of PVA/C specimens

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图 6 PVA/C试件滞回曲线

Figure 6. Hysteretic loops of PVA/C specimens

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图 7 PVA/C试件骨架曲线

Figure 7. Skeleton curves of PVA/C specimens

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图 8 PVA/C试件曲率

Figure 8. Curvature of PVA/C specimens

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图 9 等效粘滞阻尼系数${\zeta _{\rm{eq}}}$计算面积

Figure 9. Calculated area of equivalent viscous damping coefficient ${{\zeta }_{\rm{eq}}}$

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图 10 各PVA/C试件${{\zeta }_{\rm{eq}}}$

Figure 10. ${\zeta _{\rm{eq}}}$ of PVA/C specimens

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图 11 PVA/C试件${\zeta _{\rm{eq}}}$与${{\varDelta / \varDelta }_{\rm{y}}}$的关系

Figure 11. Relationship between ${\zeta _{\rm{eq}}}$ and ${{\varDelta / \varDelta }_{\rm{y}}}$ of PVA/C specimens

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图 12 PVA/C总耗能与耗能比

Figure 12. Total energy consumption and energy consumption ratio of PVA/C

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图 13 PVA/C刚度退化

Figure 13. Stiffness degradation of PVA/C

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表 1 试验工况

Table 1. Test conditions

Specimen	Fiber volume fraction $ \rho _{\rm{f}} $/vol%	Designed axial compression ratio n	Text axial compression ratio n_t	Shear span ratio	Rebar	Stirrup	Stirrup volume ratio $ \rho _{\rm{v}} $/%
0vol%PVA/C-70	0	0.3	0.179	5.5	412	Φ8@70	1.74
1vol%PVA/C-70	1.0	0.3	0.179	5.5	412	Φ8@70	1.74
2vol%PVA/C-70	2.0	0.3	0.179	5.5	412	Φ8@70	1.74
1vol%PVA/C-100	1.0	0.3	0.179	5.5	412	Φ8@100	1.22
1vol%PVA/C-130	1.0	0.3	0.179	5.5	412	Φ8@130	0.94
Note: PVA/C—Polyvinyl alcohol fiber reinforced cementitious composite.

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表 2 PVA/C配合比

Table 2. Mix proportion of PVA/C

Cement	Fly ash	Water	Sand	Thickener/%	Defoamer/%	Plasticizer/%	Fiber content/vol%
0.8	0.2	0.5	0.8	0.05	1	0.1	0, 1, 2
Notes: Fiber content—Volume fraction, other materials are mass ratio; Water/cement mass ratio is 0.5.

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表 3 PVA纤维性能

Table 3. Properties of PVA fiber

Fineness/dtex	Density/(g·cm⁻³)	Diameter/mm	Elongation/%	Length/mm	Tensile strength/MPa	Elastic modulus/GPa
15	1.3	0.04	6	12	1600	40

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表 4 钢筋受拉力学性能参数

Table 4. Tensile mechanical properties of rebar

Steel grade	Diameter/mm	Yield strength/MPa	Ultimate strength/MPa	Elongation after fracture/%
HRB400	12	442	635	25.0
	16	449	640	23.0
	20	450	640	22.5

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表 5 PVA/C材料力学性能

Table 5. Mechanical properties of PVA/C

Fiber content/vol%	f_cu/MPa	f_c/MPa	f_t/MPa
0	46.63	42.66	2.25
1	46.31	41.18	4.70
2	46.12	40.81	5.08
Notes: f_cu—Cube crushing strength; f_c—Prism compressive strength; f_t—Axial tensile strength.

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表 6 PVA/C试件特征值

Table 6. Characteristic values of PVA/C specimens

Specimen	Loading direction	Cracking point		Yield point		Peak point		Ultimate point
Specimen	Loading direction	P_cr/kN	$\varDelta _{\rm{cr}}$/mm	P_y/kN	$\varDelta_{\rm{y}}$/mm	P_m/kN	$\varDelta_{\rm{m}}$/mm	P_u/mm	$\varDelta_{\rm{u}}$/mm
0vol%PVA/C-70	Positive direction	6.60	1.86	24.20	16.43	29.40	22.24	14.95	51.00
0vol%PVA/C-70	Negative direction	−11.2	−0.29	−38.30	−14.83	−43.40	−23.45	−36.90	−50.54
1vol%PVA/C-70	Positive direction	17.60	3.41	26.70	11.38	31.70	22.7	13.66	59.04
1vol%PVA/C-70	Negative direction	−9.60	−0.84	−37.70	−14.44	−45.40	−24.31	−38.60	−60.39
2vol%PVA/C-70	Positive direction	17.50	3.40	25.50	11.31	31.10	25.19	18.40	68.92
2vol%PVA/C-70	Negative direction	−9.40	−1.43	−33.70	−18.20	−41.00	−27.06	−34.90	−77.73
1vol%PVA/C-100	Positive direction	11.80	2.57	26.20	10.40	30.60	22.06	17.36	46.06
1vol%PVA/C-100	Negative direction	−11.80	−1.56	−38.1	−12.44	−45.10	−23.12	−38.30	−44.15
1vol%PVA/C-130	Positive direction	10.00	2.74	25.40	11.89	29.10	18.65	16.06	43.00
1vol%PVA/C-130	Negative direction	−13.30	−1.44	−32.20	−10.16	−39.50	−25.39	−33.60	−41.04
Notes: P_cr—Column cracking load; $\varDelta _{\rm{cr}}$—Column cracking displacement; P_y—Yield load of longitudinal reinforcement; $\varDelta_{\rm{y}}$—Specimen yield displacement; P_m—Peak load; $\varDelta_{\rm{m}}$—Displacement when the column reached peak load; P_u—Loads of specimens in both positive and negative directions decreased to 85% of peak load; $\varDelta_{\rm{u}}$—Displacement when the column reached ultimate load.

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表 7 PVA/C试件位移参数汇总

Table 7. Summary of displacement parameters of PVA/C specimens

Specimen	Yield displacement $ {\varDelta}_{\rm{y}} $/mm	Ultimate displacement $ {\varDelta}_{\rm{u}} $/mm	Displacement ductility coefficient ${{\mu }}$		Elastic-plastic limit displacement angle $\mathop \theta \nolimits_{\rm{u}} $
Specimen	Yield displacement $ {\varDelta}_{\rm{y}} $/mm	Ultimate displacement $ {\varDelta}_{\rm{u}} $/mm	Absolute value	Relative value	Absolute value	Relative value
0vol%PVA/C-70	15.63	50.77	3.25	1	1/22	1
1vol%PVA/C-70	12.91	59.72	4.63	1.42	1/19	1.16
2vol%PVA/C-70	14.76	73.33	4.97	1.53	1/15	1.47
1vol%PVA/C-100	11.42	45.11	3.95	1.22	1/24	0.92
1vol%PVA/C-130	11.03	42.02	3.81	1.17	1/26	0.85

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表 8 PVA/C位移延性系数试验结果与计算结果对比

Table 8. Comparison between test results and calculated values of displacement ductility coefficient of PVA/C

Specimen	Test value ${{\mu }_{\rm{e}}}$	Calculated value ${{\mu }_{\rm{c}}}$	${{{{\mu }_{\rm{c}}}} / {{{\mu }_{\rm{e}}}}}$
1vol%PVA/C-70	4.63	4.63	1.00
2vol%PVA/C-70	4.97	5.10	0.97
1vol%PVA/C-100	3.95	2.60	1.52
1vol%PVA/C-130	3.81	4.39	0.87
R/FRC3^[10]	3.44	3.39	1.01
R/FRC4^[10]	3.35	3.39	0.99
R/FRC5^[10]	3.58	3.21	1.11
R/FRC6^[10]	3.48	3.21	1.08
S1^[19]	3.11	3.80	0.82
S3^[19]	3.71	3.80	0.98
S6^[20]	6.09	5.54	1.09
S7^[20]	5.15	5.39	0.96

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表 9 PVA/C曲率计算值

Table 9. Curvature calculation values of PVA/C

Specimen	Yield curvature $\mathop {\varphi }\nolimits_{\rm{y}} $	Relative yield curvature	Peak curvature $\mathop \varphi \nolimits_{\rm{p}} $	Relative peak curvature
0vol%PVA/C-70	2.71×10⁻⁵	1.00	3.43×10⁻⁵	1.00
1vol%PVA/C-70	3.05×10⁻⁵	1.13	4.68×10⁻⁵	1.36
2vol%PVA/C-70	3.26×10⁻⁵	1.20	4.89×10⁻⁵	1.43
1vol%PVA/C-100	2.99×10⁻⁵	1.10	4.36×10⁻⁵	1.27
1vol%PVA/C-130	2.39×10⁻⁵	0.88	3.36×10⁻⁵	0.98

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