高延性FRP加固大尺寸混凝土柱轴压力学性能研究

白玉磊; 张思嫚; 朱铮; 李文枫

doi:10.11899/zzfy20210410

高延性FRP加固大尺寸混凝土柱轴压力学性能研究

doi: 10.11899/zzfy20210410

1.
北京工业大学, 城市与工程安全减灾教育部重点实验室, 北京100124
2.
中国电力工程顾问集团东北电力设计院有限公司, 工程技术中心, 长春130000

基金项目: 国家自然科学基金（51778019）

详细信息

作者简介:
白玉磊，男，生于1985年。副教授，博士生导师。主要从事桥梁抗震与加固研究工作。E-mail：baiyl_bjut@163.com

通讯作者:
李文枫，男，生于1984年。高级工程师。主要从事能源领域结构的设计与研究工作。E-mail：64978797@qq.com

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出版历程
- 收稿日期: 2021-05-26
- 刊出日期: 2021-12-31

Behavior of High Ductility FRP-confined Large-size Concrete Columns Under Axial Compression

1.
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
2.
Engineering Technical Centre, Northeast Electric Power Design Institute Co.LTD of China Power Engineering Consulting Group, Changchun 13000, China

摘要

摘要: 现有纤维增强复合材料（FRP）约束混凝土短柱的研究多基于小尺寸试件，对大尺寸试件的研究较少。聚对苯二甲酸乙二醇酯纤维增强复合材料（PET FRP）和聚萘二甲酸乙二醇酯纤维增强复合材料（PEN FRP）是由回收废弃塑料制成的环保型高延性FRP。高延性FRP具有超过5%的断裂应变，超过传统FRP断裂应变（1.5～3%）。本研究对8个PET FRP约束混凝土圆柱（直径300、400 mm试件各4个）与8个PEN FRP约束混凝土方柱（边长300、400 mm试件各4个）进行轴压力学性能试验，研究构件截面形状、FRP层数等参数对试件轴压力学性能的影响。试验结果表明：高延性FRP约束混凝土柱应力-应变曲线由3个不同的部分组成；部分高延性FRP约束混凝土柱应力-应变曲线第2段出现了下降段，与约束刚度较小有关；相同尺寸的试件，随着高延性FRP层数（厚度）的增加，试件承载力提高，延性更好；对于PEN FRP约束混凝土方柱，在同一轴向变形、高度区域处，环向面应变较环向角应变大，且环向面应变的增加值大于角区域；采用现有高延性FRP约束混凝土柱模型，对约束圆形和方形混凝土柱轴压力学性能提供相对合理的预测。
- 高延性FRP /
- 约束混凝土 /
- 大尺寸圆柱方柱 /
- 轴压试验力学性能
Abstract: Most of the existing researches on fiber reinforced polymer (FRP) composite-confined concrete short columns are based on small size specimens, and large-size columns have not been fully studied. PET (Polyethylene Terephthalate) FRP and PEN (Polyethylene Naphthalene) FRP are environmentally friendly large rupture strain FRPs made from recycled waste plastic. Compared with traditional FRP, high ductility FRP materials have a fracture strain larger than 5%, which is far larger than that of traditional FRP materials with the value of 1.5～3%. In recent years, high ductility FRP has become a research hotspot all over the world. In this paper, the axial compressive behavior of 8 PET FRP-confined concrete columns and 8 PEN FRP-confined concrete columns were experimentally studied. The main research parameters included the shape of specimens and the number of FRP layers. Results show that the stress-strain curve of high ductility FRP-confined concrete columns has three different parts; the second part of stress-strain curve of partially high ductility FRP-confined concrete columns appears a descending section, which is related to the small constraint stiffness; the bearing capacity and ductility of same size specimens increase with the increase of FRP thickness; The middle strain is larger than corner strain of PEN FRP-confined concrete square columns at the same axial deformation. Moreover, the existing stress strain models for high ductility FRP-confined concrete were evaluated with the test results.
- High ductility FRP /
- Confined concret /
- Large size cylindrical and square columns /
- Axial compression

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图 1 试件截面尺寸(单位：mm)

Figure 1. Cross-sections of test specimens (Unit: mm)

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图 2 PET FRP拉伸试验

Figure 2. Tensile test of PET FRP

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图 3 PEN FRP拉伸试验

Figure 3. Tensile test of PEN FRP

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图 4 PET FRP拉伸应力-应变曲线

Figure 4. Tensile stress-strain curves of PET FRP

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图 5 PEN FRP拉伸应力-应变曲线

Figure 5. Tensile stress-strain curves of PEN FRP

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图 6 测量设备布置

Figure 6. Test setup and instrumentation details

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图 7 应变片布置示意

Figure 7. Distribution of strain gauges

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图 8 试验结束后的试件

Figure 8. Specimens after test

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图 9 试件轴向应力-应变曲线

Figure 9. Axial stress- strain curves

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图 10 方柱环向应变分布

Figure 10. Distribution of hoop strains on PEN FRP

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图 11 试件轴向应变和环向面应变、角应变之间的关系

Figure 11. Axial strain-lateral strain curves

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图 12 模型预测结果与试验结果的对比

Figure 12. Comparison of model and test curves

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表 1 试件编号及参数

Table 1. Details of specimens

试件编号	直径或边长/mm	高度/mm	角半径/mm	材料类型	FRP层数/层
C-PET-300-2-a,b	300	600	—	PET FRP	2
C-PET-300-3-a,b	300	600	—	PET FRP	3
C-PET-400-2-a,b	400	800	—	PET FRP	2
C-PET-400-4-a,b	400	800	—	PET FRP	4
S-PEN-300-2-a,b	300	600	60	PEN FRP	2
S-PEN-300-3-a,b	300	600	60	PEN FRP	3
S-PEN-400-2-a,b	400	800	80	PEN FRP	2
S-PEN-400-4-a,b	400	800	80	PEN FRP	4

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表 2 圆柱主要试验结果

Table 2. Key results of circular column tests

试件编号	f_cu ′ /MPa	ε_cu/%	ε_h,rup/%	最大环向应变对应的应变片编号
C-PET-300-2-a	37.2	1.79	3.38	SG1
C-PET-300-2-b	39.2	2.28	3.86	SG5
C-PET-300-3-a	49.6	3.51	4.16	SG1
C-PET-300-3-b	50.4	3.41	4.24	SG4
C-PET-400-2-a	35.9	1.67	3.38	SG1
C-PET-400-2-b	36.2	1.75	3.23	SG2
C-PET-400-4-a	45.2	2.19	3.28	SG5
C-PET-400-4-b	45.0	2.24	3.36	SG1

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表 3 方柱主要试验结果

Table 3. Key results of square column tests

试件编号	f_cu ′ /MPa	ε_cu/%	ε_h,c/%	ε_h,s/%	最大环向应变对应的应变片编号
S-PEN-300-2-a	37.6	2.34	1.46	2.19	SG9
S-PEN-300-2-b	38.4	2.28	1.75	2.34	SG1
S-PEN-300-3-a	54.8	3.14	1.77	2.84	SG1
S-PEN-300-3-b	53.3	3.42	1.37	2.73	SG1
S-PEN-400-2-a	35.5	1.66	1.60	2.01	SG9
S-PEN-400-2-b	35.5	1.79	2.40	2.38	SG5
S-PEN-400-4-a	47.9	2.64	1.50	2.43	SG9
S-PEN-400-4-b	49.0	2.39	0.90	2.18	SG1

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