纤维增强树脂复合材料布约束不同强度混凝土配筋柱抗震性能

黄镜渟; 高鹏; 周安; 马翠玲; 姚军

doi:10.13801/j.cnki.fhclxb.20220811.002

纤维增强树脂复合材料布约束不同强度混凝土配筋柱抗震性能

doi: 10.13801/j.cnki.fhclxb.20220811.002

黄镜渟^{1, 3},
高鹏^{2, 3, ,},
周安²,
马翠玲¹,
姚军¹

1.
合肥学院　城市建设与交通学院，合肥 230601
2.
合肥工业大学　土木与水利工程学院，合肥 230009
3.
中国地震局工程力学研究所　地震工程与工程振动重点实验室，哈尔滨 065000

基金项目: 国家自然科学基金(51208166)；中国地震局地震工程与工程振动重点实验室重点专项(2020 EEEVL0417)；合肥学院人才科研基金(21-22 RC38)；安徽省高校优秀青年人才基金项目(GXYQ2020068)

详细信息

通讯作者:
高鹏，博士，副教授，硕士生导师，研究方向为纤维复合材料加固混凝土结构　E-mail: penggao@hfut.edu.cn

中图分类号: TU375
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- 文章访问数: 940
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-06
- 修回日期: 2022-07-12
- 录用日期: 2022-07-28
- 网络出版日期: 2022-08-12
- 刊出日期: 2022-11-01

Seismic performance of FRP-confined reinforced concrete columns with different concrete strength

HUANG Jingting^{1, 3},
GAO Peng^{2, 3
, ,},
ZHOU An²,
MA Cuiling¹,
YAO Jun¹

1.
School of Urban Construction and Transportation, Hefei University, Hefei 230601, China
2.
School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
3.
Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 065000, China

摘要

摘要: 为了研究纤维增强树脂复合材料(FRP)布约束不同强度混凝土配筋柱的抗震性能，对4根约束柱及2根对比柱进行了低周反复荷载作用下的拟静力试验研究，探讨了混凝土强度和FRP种类等参数对加固柱抗震性能的影响。试验结果表明，加固构件均发生弯曲破坏，其承载、延性和耗能能力均有提高。且当柱混凝土强度大幅提高时，其延性和耗能指标较未加固前的提高率上升明显。在等围压条件下，玄武岩纤维布(BFRP)和碳纤维布(CFRP)约束柱的承载力相近，对于加固普通强度混凝土柱，使用BFRP较CFRP会得到更高的延性和耗能能力提升，但对于混凝土强度等级高至C50的柱，CFRP约束后柱的抗震性能略好。最后分别提出了针对不同FRP加固钢筋混凝土柱的骨架曲线模型，且基于更广泛混凝土强度、纵筋配筋率和轴压比范围下的数值计算结果也验证了试验结论。
- 纤维增强树脂复合材料 /
- 约束柱 /
- 混凝土强度 /
- 抗震性能 /
- 骨架曲线
Abstract: To investigate the seismic performance of fiber reinforced polymer (FRP) confined reinforced concrete columns with different concrete strength, the quasi-static test was carried out on four confined columns and two control columns under low cyclic lateral load. The influence of parameters such as concrete strength and FRP type on the test results was investigated. The test results show that the columns have flexural failure after confinement. The strength, ductility and energy dissipation capacity of columns are enhanced. The increments of ductility and energy dissipation indexes are observed to improve significantly when the concrete strength of confined columns increases greatly. With the same confining pressure, the peak loads of basalt fiber reinforced polymer (BFRP) and carbon fiber reinforced polymer (CFRP) confined columns are nearly same. The BFRP-confined normal-strength concrete column has higher ductility and energy dissipation capacity. But the seismic performance of CFRP-confined concrete columns is slightly better when the concrete strength grade reaches C50. The skeleton curve models were proposed for different FRP confined columns. The results of parameter analysis verify the experimental conclusions based on the wider range of concrete strength, longitudinal reinforcement and axial compression ratio.
- FRP /
- confined columns /
- concrete strength /
- seismic performance /
- skeleton curve

HTML全文

图 1 玄武岩纤维布(BFRP)和碳纤维布(CFRP)约束钢筋混凝土(RC)柱尺寸、配筋和加固方案图

Figure 1. Dimensions, reinforcements and strengthening scheme of basalt fiber reinforced polymer (BFRP) and carbon fiber reinforced polymer (CFRP)-confined reinforced concrete (RC) columns

Φ—Diameter; FRP—Fiber reinforced polymer

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图 2 试验柱抗震试验加载装置

B3S50A3—Label of specimen; 0.25Δ—Label of displacememnt loading cycle

Figure 2. Seismic test setup of tested columns

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图 3 试验柱测点布置

Figure 3. Arrangement of measuring points for tested columns

F1, F2, F3, F4, F7, S1, S2, S3—Strain gauges of FRP and stirrups

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图 4 BFRP和CFRP约束不同强度混凝土配筋柱破坏形态

Figure 4. Failure modes of BFRP and CFRP-confined RC columns with different concrete strength

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图 5 BFRP和CFRP约束不同强度混凝土配筋柱滞回曲线

Figure 5. Hysteretic curves of BFRP and CFRP-confined RC columns with different concrete strength

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图 6 BFRP和CFRP约束不同强度混凝土配筋柱骨架曲线

Figure 6. Skeleton curves of BFRP and CFRP-confined RC columns with different concrete strength

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图 7 BFRP和CFRP约束不同强度混凝土配筋柱强度退化曲线

Figure 7. Strength degration curves of BFRP and CFRP-confined RC columns with different concrete strength

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图 8 BFRP和CFRP约束不同强度RC柱刚度退化曲线

Figure 8. Stiffness degration curves of BFRP and CFRP-confined RC columns with different concrete strength

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图 9 BFRP和CFRP约束RC柱截面应力-应变分布

Figure 9. Sectional stress and strain distribution of BFRP and CFRP-confined RC columns

D—Diameter of section; d_x—Width of concrete strip; h—Height of concrete compression zone; x—Distance from concrete strip to the top of section; $ \varepsilon _{{\text{cc}}}^{{'}} $—Maximum strain of concrete edge in compression zone; $ \varepsilon _{\text{c}}' $—Strain of concrete strip; $ {\varepsilon _{{\text{s}}i}} $—Strain of the ith row of reinforcements; M—Bending moment of section; N—Axial load of section; $ \sigma _{\text{c}}^{{'}} $—Stress of concrete strip; $ {\sigma _{{\text{s}}i}} $—Stress of the ith row of reinforcements; A_si—Area of the ith row of reinforcements

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图 10 BFRP和CFRP约束不同强度混凝土配筋柱试验与计算骨架曲线的对比

Figure 10. Comparison of skeleton curves between test and calculation of BFRP and CFRP-confined RC columns with different concrete strength

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图 11 混凝土强度组BFRP和CFRP约束RC柱骨架曲线计算结果

Figure 11. Calculated results of skeleton curves of BFRP and CFRP-confined RC columns with different concrete strength

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图 12 纵筋配筋率组BFRP和CFRP约束RC柱骨架曲线计算结果

Figure 12. Calculated results of skeleton curves of BFRP and CFRP-confined RC columns with different longitudinal reinforcement ratio

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图 13 轴压比组BFRP和CFRP约束RC柱骨架曲线计算结果

Figure 13. Calculated results of skeleton curves of BFRP and CFRP-confined RC columns with different axial compression ratio

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表 1 BFRP和CFRP约束RC柱主要设计参数

Table 1. Main design parameter of BFRP and CFRP-confined RC columns

Specimen	Axial load N/kN	FRP layer	f_cu/MPa
U-S25	252.3	–	31.4
U-S50	489.9	–	57.8
B3-S25	252.3	3-layer BFRP	31.4
B3-S50	489.9	3-layer BFRP	57.8
C1-S25	252.3	1-layer CFRP	31.4
C1-S50	489.9	1-layer CFRP	57.8
Notes: f_cu—Concrete compressive strength; U—Unconfined; B or C—BFRP or CFRP; S—Concrete strength. The numeral after B or C represents the number of FRP layers. The numeral after S denotes grade of concrete strength.

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表 2 钢筋的力学性能指标

Table 2. Mechanical properties of reinforcements

Diameter /mm	Strength grade	Yield strength f_y/MPa	Ultimate strength f_u/MPa	Elastic modulus E_s/GPa	Ductility ε_u/%
18	HRB400	477.3	626.5	208.2	30.0
6	HPB300	393.3	519.6	215.0	25.5

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表 3 FRP布的力学性能指标

Table 3. Mechanical properties of FRP sheets

Type	Thickness t/mm	Tensile strength f_frp/MPa	Elastic modulus E_frp/GPa	Rupture strain ε_frp/%
BFRP	0.107	1857.3	79.4	2.4
CFRP	0.167	3629.9	245.5	1.5

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表 4 BFRP和CFRP约束不同强度混凝土配筋柱的抗震试验结果

Table 4. Seismic test results of BFRP and CFRP-confined RC columns with different concrete strength

Specimen	Yield point		Peak point		Ultimate point		μ_Δ	E_sum / (kN·mm)	ξ_e
Specimen	Δ_y/mm	P_y/kN	Δ_c/mm	P_c/kN	Δ_u/mm	P_u/kN	μ_Δ	E_sum / (kN·mm)	ξ_e
U-S25	14.65	64.33	29.94	78.67	46.34	66.87	3.17	37465	0.322
U-S50	11.94	79.42	19.96	101.12	30.71	85.95	2.57	36684	0.336
B3-S25	18.15	73.68	89.92	97.71	123.92	83.06	6.91	278986	0.348
B3-S50	15.02	101.51	34.96	122.56	91.40	104.18	6.13	210566	0.377
C1-S25	17.40	71.38	89.90	98.40	112.46	83.64	6.64	236945	0.344
C1-S50	15.49	99.87	49.96	124.40	93.66	105.74	6.14	240994	0.380
Notes: Δ_y—Yield placement; P_y—Yield load; P_c—Peak load; Δ_c—Peak placement; P_u—Ultimate load; Δ_u—Ultimate displacement; μ_Δ—Displacement ductility factor; E_sum—Total accumulative dissipated energy at the ultimate state; ξ_e—Equivalent viscous damping ratio at the ultimate state.

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表 5 BFRP和CFRP约束RC柱计算与试验结果比较

Table 5. Comparison between calculated and test results of BFRP and CFRP-confined RC columns

Specimen	P_{c, cal} /kN	P_{c, exp}/kN	P_{c, exp}/P_{c, cal}	Δ_{u, cal} /mm	Δ_{u, exp} /mm	Δ_{u, exp}/Δ_{u, cal}
U-S25	72.66	78.67	1.08	48.20	46.34	0.96
U-S50	93.98	101.12	1.08	33.97	30.71	0.90
B3-S25	86.07	97.71	1.14	121.64	123.92	1.02
B3-S50	111.64	122.56	1.10	103.55	91.40	0.88
C1-S25	85.02	98.40	1.16	115.23	112.46	0.98
C1-S50	110.67	124.40	1.12	102.17	93.66	0.92
Notes: P_{c, cal}—Calculated peak load; P_{c, exp}—Experimental peak load; Δ_{u, cal}—Calculated ultimate displacement; Δ_{u, exp}—Experimental ultimate displacement.

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表 6 BFRP和CFRP约束RC柱计算参数及结果

Table 6. Calculated parameters and results of BFRP and CFRP-confined RC columns

Group	Specimen	FRP layer	f_cu/ MPa	D/ mm	ρ_s/ %	n	P_y,cal/ kN	Δ_y,cal/ mm	P_c,cal/ kN	Incr. of P_c,cal/%	Δ_u,cal/ mm	Incr. of Δ_u,cal/%
Concrete strength	NU-S15 D18 A3	–	22.4	18	2.16	0.3	49.94	10.15	64.56	–	54.77	–
	NU-S25 D18 A3	–	31.3	18	2.16	0.3	55.63	9.96	72.66	–	48.20	–
	NU-S50 D18 A3	–	57.8	18	2.16	0.3	75.37	8.74	93.98	–	33.97	–
	NU-S60 D18 A3	–	69.7	18	2.16	0.3	76.86	7.88	102.37	–	28.37	–
	NB3-S15 D18 A3	3-layer BFRP	22.4	18	2.16	0.3	62.55	11.33	75.00	16.2	137.94	151.9
	NB3-S25 D18 A3	3-layer BFRP	31.3	18	2.16	0.3	73.04	11.16	86.17	18.6	122.18	153.5
	NB3-S50 D18 A3	3-layer BFRP	57.8	18	2.16	0.3	95.54	10.48	112.14	19.3	103.93	205.9
	NB3-S60 D18 A3	3-layer BFRP	69.7	18	2.16	0.3	101.46	10.19	122.17	19.3	84.50	197.8
	NC1-S15 D18 A3	1-layer CFRP	22.4	18	2.16	0.3	63.72	11.11	74.04	14.7	129.78	137.0
	NC1-S25 D18 A3	1-layer CFRP	31.3	18	2.16	0.3	75.21	11.04	85.02	17.0	115.23	139.1
	NC1-S50 D18 A3	1-layer CFRP	57.8	18	2.16	0.3	88.99	10.32	110.67	17.8	102.17	200.8
	NC1-S60 D18 A3	1-layer CFRP	69.7	18	2.16	0.3	104.53	10.01	120.41	17.6	82.35	190.3
Longitudinal reinforcement ratio	NU-S25 D22 A3	–	31.3	22	3.23	0.3	75.38	10.35	87.96	–	52.48	–
	NU-S50 D22 A3	–	57.8	22	3.23	0.3	87.81	8.40	107.94	–	36.78	–
	NB3-S25 D22 A3	3-layer BFRP	31.3	22	3.23	0.3	90.82	11.61	105.82	20.3	128.96	145.7
	NB3-S50 D22 A3	3-layer BFRP	57.8	22	3.23	0.3	113.63	10.75	137.83	27.2	108.20	194.2
	NC1-S25 D22 A3	1-layer CFRP	31.3	22	3.23	0.3	91.05	11.35	106.11	20.6	123.56	135.4
	NC1-S50 D22 A3	1-layer CFRP	57.8	22	3.23	0.3	113.43	10.65	135.74	25.8	107.48	192.2
Axial compression ratio	NU-S25 D18 A9	–	31.3	18	2.16	0.9	71.03	9.70	84.42	–	31.42	–
	NU-S50 D18 A9	–	57.8	18	2.16	0.9	97.86	9.09	108.01	–	23.53	–
	NB3-S25 D18 A9	3-layer BFRP	31.3	18	2.16	0.9	102.43	10.39	113.18	34.1	108.04	243.9
	NB3-S50 D18 A9	3-layer BFRP	57.8	18	2.16	0.9	123.28	10.17	145.08	34.3	83.15	253.4
	NC1-S25 D18 A9	1-layer CFRP	31.3	18	2.16	0.9	98.86	10.48	113.62	34.6	105.40	235.5
	NC1-S50 D18 A9	1-layer CFRP	57.8	18	2.16	0.9	127.28	10.14	145.65	34.8	83.91	256.6
Notes: N—Numerical calculated column; f_cu—Concrete compressive strength; D—Diameter of longitudinal reinforcement; ρ_s—Longitudinal reinforcement ratio; n—Axial compression ratio; P_y,cal—Calculated yield load; Δ_y,cal—Calculated yield displacement; P_c,cal—Calculated peak load; Δ_u,cal—Calculated ultimate displacement; Incr.—Increment in performance index after FRP confinement.

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