自修复SMA/ECC复合材料加固RC梁受弯性能试验研究

钱辉; 陈程; 张庆元; 康莉萍; 赵军

doi:10.6052/j.issn.1000-4750.2021.11.0871

自修复SMA/ECC复合材料加固RC梁受弯性能试验研究

doi: 10.6052/j.issn.1000-4750.2021.11.0871

钱辉^1,,
陈程^1,,
张庆元^1,,
康莉萍^2, ,,
赵军^1,

1.
郑州大学土木工程学院，河南，郑州 450001
2.
郑州航空工业管理学院土木建筑学院，河南，郑州 450046

基金项目: 国家自然科学基金项目(51987631，51478438)

详细信息

作者简介:
钱　辉(1978−)，男，河南人，教授，博士，博导，主要从事智能材料与结构振动控制研究(E-mail: qianhui@zzu.edu.cn)

陈　程(1996−)，女，河南人，硕士生，主要从事智能材料与结构振动控制研究(E-mail: 18839116627@163.com)

张庆元(1992−)，女，河南人，硕士生，主要从事智能材料与结构振动控制研究(E-mail: 249511269@qq.com)

赵　军(1971−)，男，河南人，教授，博士，博导，主要从事结构工程研究(E-mail: zhaoj@zzu.edu.cn)

通讯作者:
康莉萍(1988−)，女，河南人，博士，主要从事高性能结构与结构振动控制研究(E-mail: kangliping2010@163.com)

中图分类号: TU37
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- 文章访问数: 188
- HTML全文浏览量: 64
- PDF下载量: 50
- 被引次数: 0
出版历程
- 收稿日期: 2021-11-09
- 修回日期: 2022-04-18
- 网络出版日期: 2022-08-12
- 刊出日期: 2023-06-25

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF RC BEAM STRENGTHENED WITH SELF-REPAIRING SMA/ECC COMPOSITES MATERIALS

QIAN Hui^1
,,
CHEN Cheng^1
,,
ZHANG Qing-yuan^1
,,
KANG Li-ping^{2
, ,},
ZHAO Jun^1
,

1.
School of Civil Engineering, Zhengzhou University, Zhengzhou, He’nan 450001, China
2.
School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics, Zhengzhou, He’nan 450046, China

摘要

摘要: 为了提高既有RC构件的承载能力、损伤自修复能力，提升其安全与使用性能，该文提出采用超弹性形状记忆合金(Shape memory alloy, 简称SMA)和工程水泥基复合材料(Engineered cementitious composites, 简称ECC)复合加固钢筋混凝土梁的方法。设计并制作了4种试验梁以对比不同增强材料加固效果，通过低周单向循环加载试验，分析了不同材料加固试验梁的破坏形态、承载力、耗能性能和自修复能力等性能的影响。研究结果表明：SMA/ECC复合加固梁不仅提高了承载能力，且具有较好的延性和变形能力，同时具有优越的自修复性能。考虑ECC拉伸应变硬化特性，建立了ECC加固梁的受弯承载力计算方法，且计算值与试验值吻合较好。
- 形状记忆合金 /
- 工程水泥基复合材料 /
- 增大截面法 /
- 抗震加固 /
- 受弯性能
Abstract: In order to improve the bearing capacity and damage self-repairing capacity as well as the safety and serviceability of existing RC members, a reinforcing method for strengthening RC beams using Shape Memory Alloy (SMA) and Engineered Cementitious Composites (ECC) was proposed. Four kinds of test beams were designed and fabricated, and the effects of different materials on the failure modes, bearing capacity, energy dissipation and self-repairing capability of the experimental beams were analyzed through the low-cycle cyclic loading test. The results show that SMA/ECC composite reinforced beam has significantly improved the bearing capacity, the ductility and deformation capacity as well as the self-repairing capability. Finally, by considering the ECC tensile strain hardening characteristics, a calculation method of the flexural capacity of ECC reinforced beams was proposed, and the calculated results were in good agreement with the experimental data.
- shape memory alloys /
- engineered cementitious composites /
- enlarging section method /
- seismic strengthening /
- flexural behavior

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图 1 加固构件形状及尺寸

Figure 1. Shape and dimension of the specimen

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图 2 试件制作过程

Figure 2. Manufacture process of the specimen

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图 3 试件的横截面和加固方案

Figure 3. Cross section and reinforcement details of specimens

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图 4 SMA棒材拉伸试验

Figure 4. Tensile test on SMA bar

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图 5 SMA棒应力-应变关系曲线

Figure 5. Stress-strain curves of SMA bar

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图 6 ECC受拉应力-应变曲线

Figure 6. Stress-strain curve of ECC

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图 7 加载装置

Figure 7. Test setup

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图 8 加载制度示意图

Figure 8. Schematic diagram of loading procedure

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图 9 ECC多缝开裂特征

Figure 9. Multiple cracking modes of ECC

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图 10 试件破坏实况

Figure 10. Specimen failure

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图 11 荷载-位移曲线

Figure 11. Load-displacement curve

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图 12 骨架曲线

Figure 12. Skeleton curve

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图 13 加卸载最大裂缝宽度曲线

Figure 13. Maximum fracture width curve under loading and unloading

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图 14 加卸载裂缝数量曲线

Figure 14. Number of fissures during loading and unloading

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图 15 加卸载跨中挠度曲线

Figure 15. Midspan deflection curve of loading and unloading

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图 16 试件耗能能力

Figure 16. Energy dissipation capacity under loading and unloading

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图 17 钢筋应变-荷载关系曲线

Figure 17. Strain-load curve of steel bar

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图 18 ECC受拉应力-应变关系曲线简化图

Figure 18. ECC tensile stress-strain curve

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表 1 试件基本参数

Table 1. Design parameters of specimens

试件编号	加固材料	截面尺寸/mm	梁长/mm	配筋
SJ-1	钢筋、混凝土	120×110	1000	2根钢筋
SJ-2	钢筋、ECC	120×110	1000	2根钢筋
SJ-3	SMA、ECC	120×110	1000	3根SMA
SJ-4	SMA、混凝土	120×110	1000	3根SMA

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表 2 ECC配合比

Table 2. Mix proportion of ECC

成分	水泥	水	粉煤灰	细砂	外加剂	PVA纤维/(%)
比例	1	1.43	1.43	0.86	0.18	2

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表 3 ECC拉伸试验结果

Table 3. Tensile test results of ECC specimens

试件编号	第1组	第2组	第3组	平均值
抗拉强度/MPa	4.26	3.89	3.46	3.87

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表 4 纵筋屈服强度

Table 4. Yield strength of longitudinal reinforcement

材料	SMA	受拉纵筋	受压纵筋
屈服强度/MPa	296.17	397.17	397.17

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表 5 混凝土强度

Table 5. concrete strength

材料	混凝土	ECC
抗压强度/MPa	17.48	18.21
抗拉强度/MPa	−	5.10

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表 6 试件承载力计算值与试验值比较

Table 6. The bearing capacity of specimens calculated value and experimental value

试件编号	加固材料	加固梁承载力计算值${{M} }_{\mathrm{c}\mathrm{u} }$	加固梁承载力实验值${{M} }_{\mathrm{t}\mathrm{u} }$	计算值与实验值的比值${{M} }_{\mathrm{c}\mathrm{u} }/{{M} }_{\mathrm{t}\mathrm{u} }$
SJ-1	钢筋、混凝土	2.75	2.96	0.92
SJ-2	钢筋、ECC	2.75	2.93	0.94
SJ-3	SMA、ECC	2.51	2.78	0.90
SJ-4	SMA、混凝土	2.51	2.76	0.91

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