高强不锈钢绞线网增强ECC加固RC短柱轴心受压试验

王新玲; 李赟璞; 李苗浩夫; 范家俊

doi:10.13801/j.cnki.fhclxb.20210804.001

高强不锈钢绞线网增强ECC加固RC短柱轴心受压试验

doi: 10.13801/j.cnki.fhclxb.20210804.001

1.
郑州大学　土木工程学院，郑州 450001
2.
中国核电工程有限公司郑州分公司，郑州 450052

基金项目: 国家自然科学基金(51879243)；国家重点研发计划项目(2017YFC1501204)；国家自然科学基金河南联合项目(U1804137)；河南省高等学校青年骨干教师培养计划(2020GGJS003)

详细信息

通讯作者:
范家俊，博士，讲师，研究方向为新型复合材料性能及结构加固　Email：jiajun.fan@zzu.edu.cn

中图分类号: TU528.58
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出版历程
- 收稿日期: 2021-04-30
- 修回日期: 2021-07-11
- 录用日期: 2021-07-23
- 网络出版日期: 2021-08-05
- 刊出日期: 2022-03-23

Compressive behavior of RC short columns strengthened with high-strength stainless steel wire strand mesh and ECC

1.
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
2.
China Nuclear Power Engineering Co. Ltd., Zhengzhou Branch, Zhengzhou 450052, China

摘要

摘要: 在新型复合材料“高强不锈钢绞线网增强工程水泥基复合材料(ECC) (简称HSME)”的力学性能和约束素混凝土受压性能研究基础上，将钢筋混凝土(RC)短柱配筋率和混凝土强度以及加固层的ECC强度和横向钢绞线配筋率作为参数，试验研究高强不锈钢绞线网增强ECC加固RC短柱轴心受压性能。结果表明，和未加固RC短柱相比，HSME加固RC短柱不仅承载力大幅度提升，而且破坏时裂而不碎、具有明显的延性破坏特征，开裂荷载、峰值荷载及峰值位移显著提高；荷载达峰值荷载80%左右和峰值荷载时，试件表面最大裂缝宽度仅为0.09 mm和0.25 mm，表现出优良的多缝开裂和裂缝控制能力。HSME加固RC短柱荷载-位移曲线属于偏态的单峰曲线，包含弹性、裂缝发展、最大荷载和承载力下降四个阶段。随着ECC抗压强度和横向不锈钢绞线配筋率增大，HSME加固柱开裂荷载和峰值荷载均明显增大；增大RC柱配筋率和混凝土强度可提高加固柱峰值荷载和延性。
- 高强不锈钢绞线网增强ECC(HSME) /
- 新型复合材料 /
- 受压性能 /
- 加固RC短柱 /
- 试验研究
Abstract: Based on the research of the mechanical property of the new composite material “high strength stainless steel wire mesh reinforced engineered cementitious composite (ECC) (referred to as HSME)” and compression performance of confined concrete with this material, the compressive behavior of reinforced concrete (RC) short columns strengthened with high strength stainless steel wire mesh reinforced ECC was studied. The test parameters contained the reinforcement ratio and concrete strength of RC short columns, the ECC strength of reinforcement layer and the reinforcement ratio of transverse steel strands. The results indicate that, compared with the unstrengthened RC short columns, the specimens of HSME-strengthened RC short columns not only greatly increase the bearing capacity, but also crack without breaking when they are damaged, exhibiting obvious ductile failure pattern. Meanwhile, the cracking load, peak load and peak displacement are significantly increased. When the applied load reaches about 80% of the peak load and peak load, the maximum crack widths on the surface of the specimen are only 0.09 mm and 0.25 mm, respectively, showing excellent multi-slit cracking ability and crack control capabilities. The load-displacement curve of the HSME-strengthened RC short column is drawn as a skewed single-peak curve, which includes four stages: Elasticity, crack development, maximum load and bearing capacity decline. With the increasing of ECC compressive strength and transverse stainless steel strands reinforcement ratio, the cracking load and peak load of HSME strengthened columns increase significantly. Increasing the reinforcement ratio and concrete strength of the RC column could increase the peak load and the ductility of the HSME strengthened column.
- high-strength stainless steel stranded wire mesh enhanced ECC (HSME) /
- new composite material /
- compressive behavior /
- strengthened RC short column /
- experimental research

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图 1 RC柱几何尺寸及配筋(单位: mm)

Figure 1. Geometry and reinforcement of RC column (Unit: mm)

$\phi $—Diameter

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图 2 加固柱(单位: mm)

Figure 2. Strengthened column (Unit: mm)

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图 3 加载装置

Figure 3. Test setup

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图 4 RC柱试件破坏模式

Figure 4. Failure pattern of RC column specimen

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图 5 HSME加固RC柱裂缝及破坏形态

Figure 5. Cracks and failure modes of HSME reinforced RC column

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图 6 典型RC柱试件荷载-位移曲线

Figure 6. Load-displacement curve of typical RC column specimen

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图 7 典型HSME加固RC柱试件荷载-ECC应变曲线

Figure 7. Load-ECC strain curve of typical HSME reinforced RC column specimen

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图 8 典型RC柱试件荷载-受压钢筋应变曲线

Figure 8. Load-compression reinforcement strain curves of typical RC column specimen

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图 9 HSME加固RC试件荷载-ECC强度曲线

Figure 9. Load-ECC strength curve of HSME reinforced RC specimen

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图 10 HSME加固RC试件荷载-横向不锈钢绞线配筋率曲线

Figure 10. Load-transverse high-strength stainless steel strands reinforcement ratio curve of HSME reinforced RC specimen

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图 11 HSME加固RC试件荷载-RC柱受压纵筋配筋率曲线

Figure 11. Load-RC column compression longitudinal reinforcement ratio curve of HSME reinforced RC specimen

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图 12 HSME加固RC试件荷载-核心混凝土强度曲线

Figure 12. Load-core concrete strength curve of HSME reinforced RC specimen

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表 1 高强不锈钢绞线网增强工程水泥基复合材料(ECC)(简称HSME)加固钢筋混凝土(RC)柱试件参数

Table 1. Test parameters of “high strength stainless steel wire mesh reinforced engineered cementitious composite (ECC) (referred to as HSME)” reinforced concrete (RC) column

Group number	Concrete strength grade	ρ/%	Water-binder ratio of ECC	ρ_w/%
HSME-RCA1	C60	1.13	0.25 (Thickener)	0.18
HSME-RCA2	C75	1.13	0.25	0.18
HSME-RCA3	C60	1.13	0.28	0.18
HSME-RCA4	C75	1.13	0.25	0.30
HSME-RCA5	C70	1.13	0.25	0.13
HSME-RCB1	C75	1.54	0.25	0.18
HSME-RCB2	C60	1.54	0.25	0.18
HSME-RCB3	C70	1.54	0.25	0.18
HSME-RCB4	C70	2.01	0.25	0.18
DB-RC1	C60	1.54	—	—
DB-RC2	C70	2.01	—	—
Notes: ρ—Reinforcement ratio of longitudinal rebars; ρ_w—Reinforcement ratio of lateral steel stranded wires; HSME-RCA—ECC strength and the reinforcement ratio of transverse high-strength stainless steel strands; HSME-RCB—Longitudinal reinforcement ratio; DB-RC—Unreinforced comparative test specimens.

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表 2 ECC抗压和抗拉试验结果

Table 2. Test results of ECC compressive and tensile

Group number	f_{m, cu}/MPa	f_{m, t}/MPa	ε
HSME-RCA1	26.5	4.34	0.0287
HSME-RCA2	34.3	3.87	0.0226
HSME-RCA3	25.2	3.73	0.0290
HSME-RCA4	34.7	3.84	0.0273
HSME-RCA5	34.3	4.04	0.0265
HSME-RCB1	35.0	3.82	0.0290
HSME-RCB2	35.6	3.76	0.0287
HSME-RCB3	34.4	4.02	0.0328
HSME-RCB4	35.2	3.49	0.0228
Notes: f_{m, cu}—Compressive strength of ECC; f_{m, t}—Tensile strength of ECC; ε—Ultimate tensile strain of ECC.

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表 3 钢筋和混凝土强度试验结果

Table 3. Test results of reinforcement and concrete strength

d/mm	f_y/MPa	Concrete strength grade	f_cu/MPa	E_c/(10⁴ MPa)
12	446	C60	55.3	3.60
14	443	C70	70.2	3.70
16	484	C75	76.3	3.75
Notes: d—Diameter of the steel bar; f_y—Yield strength of steel bars; f_cu—Average values of cube compressive strength; E_c—Elastic modulus.

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表 4 HSME加固RC柱试验结果

Table 4. Test results of HSME reinforced RC column

Group number	ρ/%	ρ_w/%	f_cu/MPa	f_m,cu/MPa	P_m/kN	ε₀	P_cr/kN	P_l/kN	ε_l	P_cr/P_m	P_l/P_m
HSME-RCA1	1.13	0.18	55.3	26.5	2059	0.0037	550	1517	0.0067	0.27	0.74
HSME-RCA2	1.13	0.18	76.3	37.3	2459	0.0037	650	1 984	0.0056	0.26	0.81
HSME-RCA3	1.13	0.18	55.3	25.2	1 884	0.0038	500	1506	0.0057	0.27	0.80
HSME-RCA4	1.13	0.30	76.3	34.7	2696	0.0034	670	1 968	0.0065	0.26	0.73
HSME-RCA5	1.13	0.13	70.2	34.3	2399	0.0036	600	1739	0.0054	0.25	0.72
HSME-RCB1	1.54	0.18	76.3	35.0	2640	0.0040	650	1 980	0.0055	0.25	0.75
HSME-RCB2	1.54	0.18	55.3	35.6	2289	0.0040	600	1763	0.0073	0.26	0.77
HSME-RCB3	1.54	0.18	70.2	31.4	2221	0.0046	600	1621	0.0064	0.27	0.73
HSME-RCB4	2.01	0.18	70.2	35.2	2363	0.0052	600	1 914	0.0074	0.25	0.81
DB-RC1	1.54	—	55.3	—	1626	0.0024	300	—	—	0.24	—
DB-RC2	2.01	—	70.2	—	1 801	0.0018	400	—	—	0.22	—
Notes: ρ_w—Reinforcement ratio of lateral steel stranded wires; P_m—Peak load of the specimen; ε₀—Peak strain of the strain gauge on the surface of the specimen; P_cr—Cracking load of specimens; P_l—Breaking load of the first strand of the test piece; ε_l—Strain corresponding to the breaking load of the first strand (Ultimate compressive strain).

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