FRP筋/珊瑚混凝土柱轴心受压承载力

陈爽; 梁淑嘉; 关纪文

doi:10.13801/j.cnki.fhclxb.20201217.001

FRP筋/珊瑚混凝土柱轴心受压承载力

陈爽^{1, 2, ,},
梁淑嘉^2,,
关纪文^2,

1.
广西科技大学　土木建筑工程学院，柳州 545006
2.
广西建筑新能源与节能重点实验室，桂林 541004

基金项目: 国家自然科学基金(51568013)；广西建筑新能源与节能重点实验室开放基金(桂科能19-J-21-3)；广西科技大学博士基金

详细信息

作者简介:
陈爽博士，副教授。研究方向为新型建筑材料，混凝土结构耐久性　E-mail：shuangchen81@163.com

通讯作者:
陈爽，博士，副教授，研究方向为新型建筑材料、混凝土结构耐久性　 E-mail：shuangchen81@163.com

中图分类号: TU377.9
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出版历程
- 收稿日期: 2020-10-14
- 录用日期: 2020-12-03
- 网络出版日期: 2020-12-16
- 刊出日期: 2021-09-30

Compression behavior of FRP bars/coral concrete columns under axial compression loading

CHEN Shuang^{1, 2, ,},
LIANG Shujia^2,,
GUAN Jiwen^2,

1.
College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China
2.
Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, China

摘要

摘要: 对8根塑料纤维增强树脂复合材料(FRP)筋/珊瑚混凝土轴心受压柱和1根钢筋/珊瑚混凝土轴心受压柱进行了承载能力试验，试验参数包括配筋率、箍筋间距、长细比和筋材种类。结果表明：相同配筋率下，FRP筋/珊瑚混凝土柱和钢筋/珊瑚混凝土柱的破坏机制不同，但受力性能良好；相同构件尺寸下，增大纵筋直径导致纵筋与混凝土保护层的黏结性能降低；减小箍筋间距有利于提高构件的延性；长细比越大的构件承载力越低。然后，基于筋材压缩性能试验的数据分析及参考文献的对比探讨，建议碳纤维增强树脂复合材料(CFRP)筋名义屈服强度取值为0.34f_y(f_y为筋材的极限抗压强度)，对应的理论值与试验结果相近，从而提出适用于CFRP筋/珊瑚混凝土柱的理论计算，为工程实践提供参考依据。
- CFRP /
- 珊瑚混凝土 /
- 轴压性能 /
- 承载力
Abstract: The axially loaded bearing capacity tests on 8 fiber reinforced polymer (FRP) bar/coral concrete columns and 1 steel bar/coral concrete column were carried out. Parameters such as reinforcement ratio, stirrup spacing, slenderness ratio and reinforcement type were discussed. The results show that the failure mechanism of FRP reinforced coral concrete column and steel bar/coral concrete column is different, but the mechanical performance is still good. Increasing the diameter of longitudinal reinforcement leads to the decrease of bonding performance between longitudinal reinforcement and concrete protective layer. Reducing the spacing of stirrups is beneficial to improve the ductility of the members, and the higher the aspect ratio, the lower the bearing capacity of the members. Then, based on the data analysis of the compression performance experiment and the comparison of references, it is suggested that the nominal yield strength of carbon fiber reinforced polymer (CFRP) reinforcement should be 0.34f_y (f_y is the ultimate compressive strength of the reinforcement), and the corresponding theoretical value is similar to the experimental results. Finally, the theoretical calculation formula for bearing capacity of CFRP/coral concrete axial compression column is put forward, which provides a reference for engineering practice.
- CFRP bars /
- coral concrete /
- axial compression properties /
- bearing capacity

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图 1 纤维增强树脂复合材料(FRP)筋试件及加载装置

Figure 1. Fiber reinforced polymer (FRP) bars and loading device

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图 2 FRP筋应力-应变曲线

Figure 2. Stress-strain curve of FRP bars

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图 3 试件截面尺寸及FRP筋骨架

Figure 3. Section size of test piece and FRP bar skeleton

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图 4 主要测点布置及加载装置

Figure 4. Loading devices and test points arrangement

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图 5 珊瑚混凝土柱的破坏图

Figure 5. Damage pictures of coral concrete columns

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图 6 纵筋破坏图

Figure 6. Damage modes of longitudinal bars

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图 7 配筋种类对珊瑚混凝土柱承载力的影响

Figure 7. Effect of the type of reinforcement on the bearing capacity of coral concrete columns

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图 8 配筋率对CFRP筋/珊瑚混凝土柱承载力的影响

Figure 8. Effect of the reinforcement ratio on the bearing capacity of CFRP bars/coral concrete columns

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图 9 箍筋间距对CFRP筋/珊瑚混凝土柱承载力的影响

Figure 9. Effect of stirrup spacing on the bearing capacity of CFRP bars/coral concrete columns

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图 10 长细比对CFRP筋/珊瑚混凝土柱承载力的影响

Figure 10. Effect of slenderness ratio on the bearing capacity of CFRP bars/coral concrete columns

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图 11 CFRP筋本构模型

Figure 11. Constitutive model of CFRP bar

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图 12 CFRP筋/珊瑚混凝柱土应力云图

Figure 12. Mises stress moire figure of CFRP bars/coral concrete column

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图 13 CFRP筋/珊瑚混凝土柱荷载-位移曲线有限元与试验结果对比

Figure 13. Comparison of load-displacement curves between FEM and test results of CFRP bars/coral concrete columns

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图 14 不同因素对CFRP筋/珊瑚混凝土柱极限承载力的影响

Figure 14. Effect of different factors on ultimate bearing capacity of CFRP bars/coral concrete columns

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图 15 CFRP筋/珊瑚混凝土柱的承载力理论值与试验值对比结果

Figure 15. Comparison of theoretical and test values of bearing capacity of CFRP bars/coral concrete columns

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表 1 珊瑚骨料的物理性能

Table 1 Physical properties of coral aggregate

Project	Saturated water absorption	Porosity	Water absorption	Bulk density/ (kg·m⁻³)	Apparent density/ (kg·m⁻³)	Cylinder compression strength/MPa
Result	18%	50%	17.9%	9.63	2400	2.02

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表 2 珊瑚混凝土配合比

Table 2 Mix proportion of coral concrete

Concrete strength	P.Ⅱ42.5	Cementitious material/(kg·m⁻³)
Concrete strength	P.Ⅱ42.5	Sand	Coral	Seawater	Pre-water absorption	Water reducing agent
C30	500	729	705	142.5	71.7	5

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表 3 珊瑚混凝土物理力学性能

Table 3 Physical and mechanical properties of coral concrete

Concrete strength	${f_{{\rm{cu}}}}$ /MPa	${f_{\rm{c}}}$ /MPa	${f_{{\rm{ts}}}}$ /MPa	Elastic/GPa	Poisson's ratio
C30	36.02	34.2	3.92	30.6	0.25
Notes: ${f_{{\rm{cu}}}}$ —Cube compressive strength; ${f_{\rm{c}}}$ —Axial compressive strength; ${f_{{\rm{ts}}}}$ —Splitting tensile strength.

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表 4 筋材的力学性能参数

Table 4 Mechanical performance parameters of rebar

Species	Diameter/mm	${E_{\rm{f}}}$ /GPa	Compressive strength/MPa	Yield strength/MPa	Tensile strength/MPa
HRB400 steel stirrup	6	210	--	401.8	527
HRB400 steel longitudinal bar	10	210	--	420.2	548.3
GFRP stirrup	6	38.7	--	--	592
CFRP stirrup	6	121.1	--	--	2040
GFRP longitudinal bar	10	48.04	676.2	--	793
CFRP longitudinal bar	8	126.2	461.2	--	2106
CFRP longitudinal bar	10	118.2	458.6	--	2003
CFRP longitudinal bar	12	108.2	456.4	--	1983
Notes: ${E_{\rm{f}}}$ —Material elastic modulus; GFRP—Glass fiber reinforced polymer; CFRP—Carbon fiber reinforced polymer.

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表 5 FRP筋/珊瑚混凝土柱试件参数

Table 5 Specimen parameters of FRP bars/coral concrete columns

Specimen number	Stirrup spacing/mm	L/b	Longitudinal reinforcement ratio/%	Reinforcement pattern	Ultimate load/kN	μ
CFRP/CC-1	φ6@50	3.3	2.09	φ10×6	731.1	1.65
CFRP/CC-2	φ6@75	3.3	2.09	φ10×6	745.1	1.63
CFRP/CC-3	φ6@100	3.3	2.09	φ10×6	741.1	1.62
CFRP/CC-4	φ6@100	3.3	1.33	φ8×6	757.9	1.32
CFRP/CC-5	φ6@100	3.3	3.01	φ12×6	730.3	1.83
CFRP/CC-6	φ6@100	4.3	2.09	φ10×6	785.1	1.39
CFRP/CC-7	φ6@100	5.3	2.09	φ10×6	729.2	1.16
Steel/CC-1	φ6@100	3.3	2.09	φ10×6	957.9	1.37
GFRP/CC-1	φ6@100	3.3	2.09	φ10×6	797.3	1.31
Notes：CC—Coral concrete；L/b—Slenderness ratio of column；μ—Ductility coefficient^[18].

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表 6 CFRP筋/珊瑚混凝土柱的承载力试验值与理论值对比

Table 6 Comparison of test and theoretical values of CFRP bars/coral concrete columns

Specimen number	${f_{\rm{c}}}$ /MPa	${E_{\rm{f}}}$ /GPa	$f'_{\rm{y}}$ /MPa	${N_{{\rm{p1}}}}$ /kN	${N_{{\rm{p2}}}}$ /kN	$N$ /kN	${N_{{\rm{p1}}}}/N$	${N_{{\rm{p2}}}}/N$
CFRP/CC-1	34.2	118.2	155.9	788.06	759.53	731.1	1.078	1.042
CFRP/CC-2	34.2	118.2	155.9	788.06	759.53	745.1	1.058	1.027
CFRP/CC-3	34.2	118.2	155.9	788.06	759.53	741.1	1.063	1.005
CFRP/CC-4	34.2	126.2	156.8	781.38	735.42	757.9	1.031	0.966
CFRP/CC-5	34.2	108.2	155.2	796.22	788.99	730.3	1.090	1.080
CFRP/CC-6	34.2	118.2	155.9	780.18	751.93	785.1	1.070	1.004
CFRP/CC-7	34.2	118.2	155.9	788.06	759.53	729.2	1.004	0.974
Notes: $f'_{\rm{y}}$ —Nominal yield strength of CFRP bars; ${N_{{\rm{p1}}}}$ —Theoretical value (Eq. 2) of bearing capacity; ${N_{{\rm{p2}}}}$ —Theoretical value (Eq. 3) of bearing capacity; $N$ —Test value.

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