高强钢绞线网增强ECC抗弯加固无损RC梁试验

李可; 赵佳丽; 李志强; 朱俊涛

doi:10.13801/j.cnki.fhclxb.20210816.004

高强钢绞线网增强ECC抗弯加固无损RC梁试验

doi: 10.13801/j.cnki.fhclxb.20210816.004

1.
郑州大学　土木工程学院，郑州 450001
2.
中建壹品投资发展有限公司，武汉 430070

基金项目: 国家自然科学基金(U1804137；51879243)；中国博士后基金(2020M672236)；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:
朱俊涛，博士，副教授，硕士生导师，研究方向为新型复合材料性能及结构加固　E-mail：juntaozhu@zzu.edu.cn

中图分类号: TU528.58
计量
- 文章访问数: 1155
- HTML全文浏览量: 341
- PDF下载量: 67
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-18
- 修回日期: 2021-07-23
- 录用日期: 2021-07-28
- 网络出版日期: 2021-08-17
- 刊出日期: 2022-07-30

Experiment on non-damaged RC beams strengthened by high-strength steel wire strand meshes reinforced ECC in bending

1.
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
2.
China Construction Yipin Investment & Development Co., Ltd., Wuhan 430070, China

摘要

摘要: 为研究高强钢绞线网增强工程水泥基复合材料(Engineered cementitious composites，ECC)加固钢筋混凝土(Reinforced concrete，RC)梁的受弯性能，考虑钢绞线直径、纵向钢绞线配筋率、ECC配方及端部锚固4个影响因素，对7个加固无损RC梁试件进行受弯试验。结果表明，在采用合理加固层端部锚固措施的情况下，通过高强钢绞线网增强ECC抗弯加固RC梁可显著提升其受弯承载力、延性、抗裂性，有效约束原RC梁的裂缝发展并减小裂缝宽度；纵向高强钢绞线配筋率的增大会提高加固梁的受弯开裂荷载、承载力、控裂能力、刚度，但试件配置过量的纵向高强钢绞线会降低加固梁的延性、韧性；在纵向高强钢绞线配筋率接近的情况下，采用直径较大的高强钢绞线，会在一定程度上降低加固梁的延性、韧性、控裂能力；加固梁的受弯开裂荷载、承载力、刚度随着ECC的弹性模量及抗拉强度的提高而增大；加固梁的控裂能力、延性、韧性随ECC极限拉应变提高而增大。
- 高强钢绞线网增强ECC /
- 结构加固 /
- RC梁 /
- 受弯性能 /
- 试验研究
Abstract: In order to study the flexural performance of reinforced concrete (RC) beams strengthened by high-strength steel wire strand (HSSWS) meshes reinforced engineered cementitious composites (ECC), the bending tests were performed on seven non-damaged RC beams considering the influence factors such as the steel strand diameter, the longitudinal steel strand reinforcement rate, formula of ECC and end anchorage. The results show that under the condition of using reasonable anchorage measures at the end of the reinforcement layer, the bearing capacity, ductility and crack-control capacity of RC beams strengthened by HSSWS meshes reinforced ECC in bending can be significantly improved, and the crack development of the original RC beam can be effectively delayed, which results in reducing crack width. The increase of longitudinal HSSWS reinforcement rate will improve the cracking load, bearing capacity, crack-control capacity and stiffness of the strengthened beams in bending, but excessive HSSWS reinforcement rate of the strengthened beams would reduce the ductility and toughness. When the reinforcement ratio of longitudinal HSSWS is close, the ductility, toughness and crack-control ability of strengthened beams would be reduced to some extent by using the HSSWS with relative large diameter. The cracking load, bearing capacity and stiffness of strengthened beams in bending increase with the increases of elastic modulus and tensile strength of ECC. The crack-control ability, ductility and toughness of strengthened beams increase with the increase of ultimate tensile strain of ECC.
- high-strength steel wire strand (HSSWS) meshes reinforced ECC /
- structural reinforcement /
- reinforced concrete beam /
- flexural performance /
- experimental study

HTML全文

图 1 高强钢绞线网(HSSWS)增强ECC加固无损钢筋混凝土(RC)梁试件几何尺寸及配筋

Figure 1. Geometric dimensions and reinforcements of non-damaged reinforced concrete (RC) beam specimens strengthened by high-strength steel wire strand (HSSWS) meshes reinforced ECC

n—The number of HSSWSs; s—The distance between adjacent HSSWSs

下载: 全尺寸图片幻灯片

图 2 纵向HSSWS端部锚固及试验装置

Figure 2. End anchorages of longitudinal HSSWS and test setup

HSSSWR—High-strength stainless steel wire rope; CFRP—Carbon fiber reinforced polymer; LVDT—Linear variable differential transformer

下载: 全尺寸图片幻灯片

图 3 典型ECC受拉应力-应变曲线

Figure 3. Typical tensile stress-strain curves of ECC

下载: 全尺寸图片幻灯片

图 4 高强钢绞线网增强ECC加固无损RC梁试件典型破坏模式图

Figure 4. Typical failure modes of RC beam specimens strengthened by HSSWS meshes reinforced ECC

下载: 全尺寸图片幻灯片

图 5 高强钢绞线网增强ECC加固无损RC梁试件弯矩-挠度曲线

Figure 5. Bending moment versus mid-span deflection curves of RC beam specimens strengthened by HSSWS meshes reinforced ECC

A—Cracking point of concrete; B—Yielding point of longitudinal steel bar; C—Ultimate moment point; D—Concrete crushing point (for unreinforced beam) or reinforcement layer rupture point (for strengthened beams)

下载: 全尺寸图片幻灯片

图 6 高强钢绞线网增强ECC加固无损RC梁试件弯矩-混凝土压应变曲线图

Figure 6. Bending moment versus concrete compressive strain curves of RC beam specimens strengthened by HSSWS meshes reinforced ECC

下载: 全尺寸图片幻灯片

图 7 典型高强钢绞线网增强ECC加固无损RC梁试件跨中截面应变分布图

Figure 7. Typical strain distribution along the height of mid-span sections of RC beam specimens strengthened by HSSWS meshes reinforced ECC

M—The applied bending moment; M_u—Ultimate bending moment

下载: 全尺寸图片幻灯片

图 8 高强钢绞线网增强ECC加固无损RC梁试件弯矩-跨中受拉纵筋应变曲线图

Figure 8. Bending moment versus tensile strain curves of longitudinal bars at mid-span of RC beam specimens strengthened by HSSWS meshes reinforced ECC

下载: 全尺寸图片幻灯片

图 9 高强钢绞线网增强ECC加固无损RC梁试件弯矩-钢绞线跨中应变曲线图

Figure 9. Bending moment versus steel wire strand strain curves at mid-span of RC beam specimens strengthened by HSSWS meshes reinforced ECC

下载: 全尺寸图片幻灯片

图 10 高强钢绞线网增强ECC加固无损RC梁试件的弯矩-最大裂缝宽度曲线

Figure 10. Bending moment versus maximum crack width curves of RC beam specimens strengthened by HSSWS meshes reinforced ECC

M_y—Yielding moment of the specimen

下载: 全尺寸图片幻灯片

图 11 高强钢绞线网增强ECC加固无损RC梁试件截面刚度-挠度曲线对比

Figure 11. Comparison of section stiffness-deflection curves of RC beam specimens strengthened by HSSWS meshes reinforced ECC

下载: 全尺寸图片幻灯片

表 1 受弯加固试件设计

Table 1. Design of the flexural strengthened specimens

Group	Specimen number	d /mm	Formula of ECC	ρ/% (n)	End anchorage
A	HSSWS3/3-ECC1-RC	3.0	Formula 1	0.348 (3)	N
	HSSWS3/5-ECC1-RC	3.0	Formula 1	0.580 (5)	Y
	HSSWS3/7-ECC1-RC	3.0	Formula 1	0.812 (7)	Y
B	HSSWS3/5-ECC2-RC	3.0	Formula 2	0.580 (5)	Y
B	HSSWS3/5-ECC3-RC	3.0	Formula 3	0.580 (5)	Y
C	HSSWS4.5/2-ECC1-RC	4.5	Formula 1	0.535 (2)	Y
Notes: d—Diameter of steel strand; ρ—Reinforcement ratio of longitudinal HSSWSs (High-strength steel wire strands); n—Number of longitudinal steel strands; N—The ends of the reinforcement layer are not anchored; Y—The ends of the reinforcement layer are anchored.

下载: 导出CSV

表 2 工程用水泥基复合材料(ECC)配合比

Table 2. Mix proportions of engineered cementitious composite (ECC)

Ingredient	Formula 1	Formula 2	Formula 3
Cement	1	1	1
Sand	0.4	0.4	0.4
Fly ash	2.5	2.5	2.5
Silica powder	0.073	0.073	0.073
Water	0.893	0.858	1.008
PVA fiber	0.072	0.072	0.074
Water reducing	0.0407	0.0407	0.0407
Thickening agent	0.00182	0.00182	0
Notes: PVA—Polyvinyl alcohol.

下载: 导出CSV

表 3 ECC材料性能

Table 3. Material properties of ECC

Formula of ECC	f_cu /MPa	E_s /GPa	f_tc /MPa	ε_tc /%	f_et /MPa	ε_u /%	ω /mm
Formula 1	37.3	14.12	1.370	0.025	2.180	1.88	0.30
Formula 2	46.5	14.63	1.915	0.035	2.815	0.75	0.35
Formula 3	36.6	14.36	1.865	0.032	2.305	2.48	0.24
Notes: f_cu—ECC compressive strength; E_s—ECC elastic modulus; f_tc—ECC cracking strength; ε_tc—ECC cracking strain; f_et—ECC tensile strength; ε_u—ECC ultimate tensile strain; ω—Crack width corresponding to peak load of ECC.

下载: 导出CSV

表 4 高强钢绞线网增强ECC加固无损RC梁受弯试验结果

Table 4. Bending test results of RC beam specimens strengthened by HSSWS meshes reinforced ECC

Specimen number	M_cr/ (kN·m)	M_y/ (kN·m)	M_u/ (kN·m)	∆_y/mm	∆_u/mm	ω_max,y/mm	S/mm	μ_∆	D_max/ (kN·mm)
Unstrengthened RC beam	2.7	12.7	15.0	6	23.3	0.5	158.5	3.15	277.41
HSSWS3/3-ECC1-RC	2.9	11.1	15.9	6.5	20.2	0.43	126.8	3.11	229.19
HSSWS3/5-ECC1-RC	3.8	16.5	21.9	9.3	35.2	0.35	126.8	3.78	602.33
HSSWS3/7-ECC1-RC	4.6	17.5	24.5	8.2	29.0	0.24	126.8	3.54	538.03
HSSWS3/5-ECC2-RC	4.4	17.7	23.7	8.3	31.2	0.4	105.7	3.76	576.40
HSSWS3/5-ECC3-RC	4.1	17.4	23.5	8.6	36.8	0.31	126.8	4.28	695.12
HSSWS4.5/2-ECC1-RC	3.8	16.7	21.1	8.5	30.4	0.38	126.8	3.58	506.48
Notes: M_cr—Cracking moment of the specimen; M_y—Yielding moment of the specimen; M_u—Ultimate bending moment of the specimen; ∆_y—Deflection of the specimen at M_y; ∆_u—Deflection of the specimen at M_u; ω_max,y—The maximum crack width of concrete of the specimen when the longitudinal reinforcement yielded; S—Average crack spacing in pure bending segment of the specimen; μ_∆—Ductility coefficient of the specimen; D_max—Flexural toughness coefficient of the specimen.

下载: 导出CSV

参考文献(20)

[1]	LIN Z, LI V C. Crack bridging in fiber reinforced cementitious composites with slip-hardening interfaces[J]. Journal of the Mechanics & Physics of Solids,1997,45(5):763-787.
[2]	徐世烺, 李贺东. 超高韧性水泥基复合材料直接拉伸试验研究[J]. 土木工程学报, 2009, 42(9):32-41. doi: 10.3321/j.issn:1000-131X.2009.09.005 XU Shilang, LI Hedong. Uniaxial tensile experiments of ultra-high toughness cementitous composite[J]. China Civil Engineering Journal,2009,42(9):32-41(in Chinese). doi: 10.3321/j.issn:1000-131X.2009.09.005
[3]	MENG D, HUANG T, ZHANG Y X. Mechanical behaviour of a polyvinyl alcohol fibre reinforced engineered cementitious composite (PVA-ECC) using local ingredients[J]. Construction and Building Materials,2017,141:259-270. doi: 10.1016/j.conbuildmat.2017.02.158
[4]	徐世烺, 李贺东. 超高韧性水泥基复合材料研究进展及其工程应用[J]. 土木工程学报, 2008(6):45-60. doi: 10.3321/j.issn:1000-131X.2008.06.008 XU Shilang, LI Hedong. A review on the development of research and application of ultra high toughness cementitious composites[J]. China Civil Engineering Journal,2008(6):45-60(in Chinese). doi: 10.3321/j.issn:1000-131X.2008.06.008
[5]	王勃, 鲁文清, 周柏成, 等. 聚乙烯醇纤维水泥砂浆加固技术的研究[J]. 四川建筑, 2016, 36(4):181-182. doi: 10.3969/j.issn.1007-8983.2016.04.066 WANG Bo, LU Wenqing, ZHOU Bocheng, et al. Study on reinforcement technology of polyvinyl alcohol fiber cement mortar[J]. Sichuan Architecture,2016,36(4):181-182(in Chinese). doi: 10.3969/j.issn.1007-8983.2016.04.066
[6]	卜良桃, 万长胜, 尹鹏. PVA-ECC加固RC足尺梁受弯性能试验研究[J]. 湖南大学学报(自然科学版), 2010, 37(1):5-10. BU Liangtao, WAN Changsheng, YIN Peng. Experimental study of full-scale RC beam reinforced by polyvinyl alcohol-engineered cementitious composite mortar in flexure[J]. Journal of Hunan University (Natural Sciences),2010,37(1):5-10(in Chinese).
[7]	马益标. 聚乙烯醇纤维砂浆钢筋网加固梁受力性能研究[D]. 长沙: 湖南大学, 2018. MA Yibiao. Research on RC beam reinforced by polyvinyl alcohol-engineered cementitious composite steel mesh[D]. Changsha: Hunan University, 2018 (in Chinese).
[8]	ZHENG Y Z, WANG W W, BRIGHAM J C. Flexural behaviour of reinforced concrete beams strengthened with a composite reinforcement layer: BFRP grid and ECC[J]. Construction & Building Materials,2016,115:424-437.
[9]	郑宇宙. FRP格栅增强ECC复合加固混凝土梁试验与计算方法研究[D]. 南京: 东南大学, 2018. ZHENG Yuzhou. Experiment and calculation method research on reinforced concrete (RC) beams strengthened with the composite of FRP grid and ECC[D]. Nanjing: Southeast University, 2018 (in Chinese).
[10]	王新玲, 陈永杰, 钱文文, 等. 高强不锈钢绞线网增强工程水泥基复合材料弯曲性能试验[J]. 复合材料学报, 2021, 38(4):1292-1301. WANG Xinling, CHEN Yongjie, QIAN Wenwen, et al. Experimental on bending performance of engineered cementitious composites reinforced by high-strength stainless steel wire strand mesh[J]. Acta Materiae Compositae Sinica,2021,38(4):1292-1301(in Chinese).
[11]	王新玲, 罗鹏程, 钱文文, 等. 高强不锈钢绞线网增强工程水泥基复合材料薄板受弯承载力研究[J]. 建筑结构学报, 2022, 43(1):164-172. doi: 10.14006/j.jzjgxb.2020.0155 WANG Xinling, LUO Pengcheng, QIAN Wenwen, et al. Study on flexural bearing capacity of high strength stainless steel wire strand mesh reinforced ECC thin plate[J]. Journal of Building Structures,2022,43(1):164-172(in Chinese). doi: 10.14006/j.jzjgxb.2020.0155
[12]	中华人民共和国住房和城乡建筑部. 混凝土结构设计规范: GB 50010—2010[S]. 北京: 中国建筑工业出版社, 2010. Ministry of Housing and Urban-Rural Development of the People's Republic of China. Code for design of concrete structures: GB 50010—2010[S]. Beijing: China Architecture & Building Press, 2010 (in Chinese).
[13]	LI K, LIU W K, ZHANG K, et al. Bond behavior of stainless-steel wire ropes embedded in engineered cementitious composites[J]. Construction and Building Materials, 2021, 281: 122622.
[14]	中华人民共和国住房和城乡建设部. 钢绞线网片聚合物砂浆加固技术规程: JGJ 337—2015[S]. 北京: 中国建筑工业出版社, 2015. Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Technical specification for strengthening of building structures with steel stranded wire mesh and polymer mortar: JGJ 337—2015[S]. Beijing: China Architecture & Building Press, 2015(in Chinese).
[15]	程佳佳, 何明胜, 李玉成, 等. 不同锚具锚固高强钢绞线性能的分析[J]. 石河子大学学报(自然科学版), 2020, 38(2):199-205. CHENG Jiajia, HE Mingsheng, LI Yucheng, et al. Analysis on the performance of steel strand with different anchorage device[J]. Journal of Shihezi University (Natural Science),2020,38(2):199-205(in Chinese).
[16]	中华人民共和国住房和城乡建设部. 混凝土结构试验方法标准: GB/T 50152—2012[S]. 北京: 中国建筑工业出版社, 2012. Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Standard for test method of concrete structures: GB/T 50152—2012[S]. Beijing: China Architecture & Building Press, 2012 (in Chinese).
[17]	林加惠. 钢绞线网片-聚合物砂浆加固RC梁受弯性能试验研究[D]. 厦门: 华侨大学, 2014. LIN Jiahui. Experimental study on the flexural behavior of RC beams strengthened with stranded wire mesh and polymer mortar[D]. Xiamen: Huaqiao University, 2014(in Chinese).
[18]	赵国藩. 高等钢筋混凝土结构学[M]. 北京: 机械工业出版社, 2005. ZHAO Guofan. Higher reinforced concrete structure[M]. Beijing: China Machine Press, 2005(in Chinese).
[19]	DONG S F, ZHOU D C, ASHRAF A. Flexural toughness and calculation model of super-fine stainless wire reinforced reactive powder concrete[J]. Cement and Concrete Composites,2019,104:103367.
[20]	黄华. 高强不锈钢绞线网-聚合物砂浆加固钢筋混凝土梁式桥试验研究与机理分析[D]. 西安: 长安大学, 2008. HUANG Hua. Experimental study and theoretical analysis on strengthening RC girder bridge with steel wire mesh and polymer mortar[D]. Xi'an: Chang’an University, 2018 (in Chinese).