聚丙烯纤维-钢筋/混凝土管节受力性能试验

刘新荣; 陈鹏; 邓志云; 梁宁慧; 谢应坤

doi:10.13801/j.cnki.fhclxb.20210203.003

聚丙烯纤维-钢筋/混凝土管节受力性能试验

doi: 10.13801/j.cnki.fhclxb.20210203.003

刘新荣^{1, 2, ,},
陈鹏^{1, 2,},
邓志云^{1, 2,},
梁宁慧^{1, 2,},
谢应坤^3,

1.
重庆大学　土木工程学院，重庆 400045
2.
库区环境地质灾害防治国家地方联合工程研究中心(重庆)，重庆 400045
3.
重庆川东南工程勘察设计院有限公司，重庆 400030

基金项目: 国家自然科学基金(41772319)；重庆市研究生科研创新项目(CYS19005)；重庆市技术创新与应用示范专项社会民生类重点研发项目(cstc2018jscx-mszdX0071)

详细信息

通讯作者:
刘新荣，博士，教授，博士生导师，研究方向为纤维混凝土与岩土工程　E-mail：liuxrong@126.com

中图分类号: TU528.58
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-14
- 录用日期: 2021-01-16
- 网络出版日期: 2021-02-04
- 刊出日期: 2021-12-01

Experimental study on the mechanical properties of polypropylene fiber-steel bar reinforced concrete pipe

LIU Xinrong^{1, 2
, ,},
CHEN Peng^{1, 2
,},
DENG Zhiyun^{1, 2
,},
LIANG Ninghui^{1, 2
,},
XIE Yingkun^3
,

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area Chongqing University, Chongqing 400045, China
3.
Chongqing Southeast Engineering Survey & Design Institute CO. LTD., Chongqing 400030, China

摘要

摘要: 顶管施工中钢筋/混凝土管节存在开裂现象，严重影响工程质量与后续营运。鉴于聚丙烯纤维具有改善混凝土抗拉、抗裂性能的作用，本文采用2种聚丙烯细纤维和1种聚丙烯粗纤维，设计了无纤维、单掺粗纤维及混掺三种尺度纤维的3组钢筋/混凝土管试件，进行了三点试验，对比分析管节的开裂破坏形态、荷载挠度曲线和开裂延性指标。并建立纤维混凝土管节三点试验的有限元模型，进一步探究聚丙烯纤维掺量对钢筋/混凝土管节受力性能的影响规律。结果表明，聚丙烯粗纤维可提高混凝土管的抗裂与承载能力，聚丙烯粗、细纤维的协同作用使管达到更高的使用和极限强度。相比无纤维管，混掺多尺度纤维提升管的使用强度和极限强度分别为28.7%和36.4%。此外，数值模拟合理地预测了纤维/混凝土管节的荷载挠度响应，并针对混凝土管节的极限强度值，得到单掺和混掺聚丙烯纤维时粗纤维的最佳掺量。
- 聚丙烯纤维 /
- 钢筋/混凝土管节 /
- 三点试验 /
- 受力性能 /
- 数值模拟
Abstract: The cracking of reinforced concrete pipe during pipe jacking construction seriously affects the project quality and subsequent operation. In view of the role of polypropylene fiber in improving the crack resistance and tensile properties of concrete, this paper adopted two types of fine polypropylene fibers and one type of crude polypropylene fiber, designing 3 groups of reinforced concrete pipe specimens, which were reinforced with plain concrete, single-scale crude fiber and hybrid three-scale fibers. The three-edge-bearing test was carried out. The cracking failure patterns, load-deflection responses and ductility indexes after cracking of these pipes were comparatively analyzed. A finite element numerical model was developed for reproducing the three-edge-bearing test to investigate the influence law of polypropylene fiber content on the mechanical properties of reinforced concrete pipe. The results show that the crack resistance and load-bearing capacities of concrete pipe are improved by adding crude polypropylene fiber, and the higher service and ultimate strength of pipe are achieved under the synergistic action of fine and crude polypropylene fibers. Compared with the pipe without fiber, the hybrid multi-scale fibers increase the service and ultimate strength by 28.7% and 36.4%. In addition, using this numerical simulation method, the load-deflection responses of fiber reinforced concrete pipe can be reasonably predicted, and the optimum contents of crude fiber when incorporating single-scale and three-scale fibers are obtained, aiming to the higher ultimate strength of concrete pipe.
- polypropylene fiber /
- reinforced concrete pipe /
- three-edge-bearing test /
- mechanical property /
- numerical simulation

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图 1 不同尺度聚丙烯纤维的外观形状

Figure 1. Appearance of polypropylene fibers of different scales

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图 2 钢筋/混凝土管节试件截面与配筋

Figure 2. Section and reinforcement of reinforced concrete pipe specimen

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图 3 三点试验加载装置示意图

Figure 3. Schematic diagram of the pipe three-edge-bearing test loading device

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图 4 钢筋/混凝土管节三点试验加载与记录的过程

Figure 4. Test process of loading and recording of reinforced concrete pipe three-edge-bearing test

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图 5 三类钢筋/混凝土试验管的开裂破坏形态

Figure 5. Cracking and failure modes of three types of test reinforced concrete pipes

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图 6 钢筋/混凝土管D_L与管顶挠度的关系曲线

Figure 6. Relation curve between D_L and top deflection of reinforced concrete pipes

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图 7 计算开裂后强度S_PC值的钢筋/混凝土管荷载-挠度曲线

Figure 7. Load-deflection curves of reinforced concrete pipes to calculate post-cracking strength S_PC value

δ—Deflection; δ_peak—Peak deflection corresponding to peak load; E_post—Area bounded by a deflection to peak deflection and a deflection

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图 8 不同挠度下三组钢筋/混凝土管的峰后开裂强度S_PC

Figure 8. Post-cracking strength S_PC at different deflection values for three reinforced concrete pipes

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图 9 钢筋/混凝土管节三点试验的有限元数值模型

Figure 9. Finite element numerical model for the three-edge-bearing test of reinforced concrete pipe

u_X, u_Y, u_Z—Displacement values in each direction of X, Y, and Z in the space rectangular coordinate system

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图 10 聚丙烯纤维/混凝土单轴拉压应力-应变曲线

Figure 10. Uniaxial compressive and tensile stress-strain curves of polypropylene fiber/concrete

f_c, f_t—Compressive and tensile strength vaules of concrete; E_c—Elasticity modulus of concrete; α_c, α_t—Shape parameters of the falling section of the concrete compressive and tensile stress-strain curves; σ_c and σ_t—Compressive and tensile stress vaules of concrete; ε—Strain vaule of concrete; ρ_c, ρ_t, n and x—Intermediate parameters during the stress calculation process; ε_c and ε_t—Compressive and tensile peak strain vaules of concrete

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图 11 钢筋/混凝土管(FPF1-FPF2-CPF-S/C组)水平和竖向应力云图

Figure 11. Horizontal and vertical stress cloud map of reinforced concrete pipe (FPF1-FPF2-CPF-S/C group)

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图 12 钢筋/混凝土管(FPF1-FPF2-CPF-S/C组)塑性区应变发展过程

Figure 12. Development process of plastic zone strain of reinforced concrete pipe (FPF1-FPF2-CPF-S/C group)

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图 13 钢筋/混凝土管数值模拟与室内试验的D_L-挠度曲线对比

Figure 13. Comparison of D_L-deflection curves between numerical simulation and laboratory test for reinforced concrete pipes

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图 14 钢筋/混凝土管顶截面1-1弯矩与挠度关系曲线

Figure 14. Relation curves of bending moment and deflection at the normal roof section 1-1 for reinforced concrete pipes

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图 15 掺聚丙烯粗纤维各组钢筋/混凝土管的D_u与粗纤维掺量的拟合曲线

Figure 15. Fitted curve between D_u and crude fiber content of the reinforced concrete pipe with incorporating crude polypropylene fiber

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图 16 混掺多尺度聚丙烯纤维各组钢筋/混凝土管的D_u与聚丙烯粗纤维掺量拟合曲线

Figure 16. Fitted curve between D_u and crude fiber content of the reinforced concrete pipe with incorporating multi-scale polypropylene fibers

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表 1 不同尺度聚丙烯纤维的物理力学性能

Table 1. Physical and mechanical properties of polypropylene fibers of different scales

Fiber code	Diameter/mm	Length/mm	Aspect ratio	Tensile strength/MPa	Elasticity modulus/GPa	Density/ (kg·m⁻³)	Recommended single dosage/(kg·m⁻³)
FPF1	0.026	19	730.8	641	8.5	0.91	0.9
FPF2	0.1	19	190	322	3.9	0.91	0.9
CPF	0.8	50	62.5	706	7.4	0.95	6.0
Notes: FPF1—Type of fine polypropylene fiber; FPF2—Another type of fine polypropylene fiber; CPF—Crude polypropylene fiber.

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表 2 C50混凝土设计配合比

Table 2. Design mix ratio of C50 concrete

Material	Cement	Coarse aggregate		Sand	Water	Water reducer
Material	Cement	10-20 mm	5-10 mm	Sand	Water	Water reducer
Dosage/(kg·m⁻³)	375	545	545	850	135	3.75

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表 3 试验各组不同尺度聚丙烯纤维的配比

Table 3. Proportions of polypropylene fibers of different scales in each specimen kg·m⁻³

Pipe code	Fine polypropylene fibers		Crude polypropylene fiber	Total content
Pipe code	FPF1	FPF2	CPF	Total content
S/C	0	0	0	0
CPF-S/C	0	0	6	6
FPF1-FPF2-CPF-S/C	0.6	0.6	4.8	6
Notes: S/C—Reinforced concrete pipe without fiber; CPF-S/C—Reinforced concrete pipe with crude polypropylene fiber; FPF1-FPF2-CPF-S/C—Reinforced concrete pipe with multi-scale polypropylene fibers.

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表 4 基于ASTM C76^[17]的钢筋/混凝土管节等级强度要求

Table 4. Grade strength requirements for reinforced concrete pipe based on ASTM C76^[17]

Concrete pipe class	D-load(D_L)/(N·m⁻¹·mm⁻¹)
Concrete pipe class	D-load_0.3(D_0.3)	D-load_u(D_u)
I	40	60
II	50	75
III	65	100
IV	100	150
V	140	175
Notes: D-load(D_L)—Supporting load value of pipe; D-load_0.3(D_0.3)—Load value when crack width is 0.3 mm, namely service strength; D-load_u(D_u)—Maximum load value, namely ultimate strength.

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表 5 各钢筋/混凝土试验管节的使用强度与极限强度

Table 5. Service load and ultimate load of each reinforced concrete pipes

Pipe code	D_L/(N·m⁻¹·mm⁻¹)
Pipe code	D_0.3	D_u
S/C	126.7	216.4
CPF-S/C	164.8	270.7
FPF1-FPF2-CPF-S/C	171.4	278.5

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表 6 钢筋/混凝土管节有限元模型单元类型与数量

Table 6. Number and types of the model elements of reinforced concrete pipe

Model part	Element number	Element type
Concrete pipe	37 500	C3D8I
Lower bearing strips	1 900
Upper bearing strip	600
Steel cage	5 390	T3D2

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表 7 钢筋/混凝土管拉压力学性能指标

Table 7. Tensile and compressive mechanical properties indexes of reinforced concrete pipes

Pipe code	λ_i+λ_j+λ_k	E_c/MPa	f_c/MPa	ε_c/10⁻⁶	α_c	f_t/MPa	ε_t/10⁻⁶	α_t
S/C	0+0+0	42 500	47.1	2 096	1.94	2.65	142	3
CPF-S/C	0+0+0.39	43 601	52.3	2 607.8	0.31	3.20	165.8	1.38
FPF1-FPF2-CPF-S/C	0.48+0.13+0.32	40 792	56.4	3 018.4	0.12	3.32	224.5	1.40
Note: λ_i, λ_j and λ_k—Eigenvalues of FPF1, FPF2 and CPF.

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表 8 混凝土损伤塑性模型(CDP)模型的塑性参数取值

Table 8. Values of the concrete damaged plastic model (CDP) model plasticity parameters

CDP model plasticity parameter	Value
Dilatation angel Ψ/(°)	36
Flow potential eccentricity	0.1
f_b0/f_c0	1.16
Stress invariant ratio K	0.67
Viscosity parameter μ	0.0009-0.001
Note: f_b0/f_c0—Ratio of ultimate strength of biaxial compression to uniaxial compression.

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表 9 钢筋/混凝土管S_PC-40试验值与模拟值对比

Table 9. Comparison of S_PC-40 between numerical simulation and laboratory test for reinforced concrete pipes

Pipe code	Test value/ (N·m⁻²)	Simulation value/(N·m⁻²)	Error/%
S/C	31.2	33.6	7.7
CPF-S/C	37.3	38.7	3.8
FPF1-FPF2-CPF-S/C	40.4	40.9	1.4

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表 10 单掺聚丙烯粗纤维各组钢筋/混凝土管的D_u模拟值

Table 10. D_u simulation value of each group of reinforced concrete with single-scale crude polypropylene fiber

Pipe code	CPF content/ (kg·m⁻³)	λ_k	E_c/MPa	f_c/MPa	ε_c/10⁻⁶	α_c	f_t/MPa	ε_t/10⁻⁶	α_t	D_u/(N·m⁻¹·mm⁻¹)
S/C	0	—	42 500	47.10	2 096.0	1.94	2.65	142.0	3.00	223.22
CPF-S/C-1	1.0	0.07	42 856	48.77	2 261.3	1.41	2.83	149.7	2.48	232.44
CPF-S/C-2	2.0	0.13	43 105	49.95	2 377.4	1.05	2.96	155.1	2.11	237.36
CPF-S/C-3	3.0	0.20	43 333	51.02	2 483.1	0.71	3.07	160.0	1.77	241.83
CPF-S/C-4	4.0	0.26	43 472	51.68	2 548.0	0.50	3.14	163.0	1.57	245.87
CPF-S/C-5	5.0	0.33	43 571	52.14	2 593.9	0.36	3.19	165.2	1.42	249.71
CPF-S/C	6.0	0.39	43 601	52.28	2 607.8	0.31	3.20	165.8	1.38	252.94
CPF-S/C-7	7.0	0.46	43 579	52.18	2 597.9	0.34	3.19	165.3	1.41	250.03
CPF-S/C-7.5	7.5	0.49	43 537	51.98	2 578.2	0.41	3.17	164.4	1.47	248.24
CPF-S/C-8	8.0	0.53	43 472	51.68	2 548.0	0.50	3.14	163.1	1.57	247.20
CPF-S/C-8.5	8.5	0.56	43 409	51.38	2 518.5	0.60	3.11	161.6	1.66	246.12
CPF-S/C-9.0	9.0	0.59	43 333	51.02	2 483.1	0.71	3.07	160.0	1.77	244.99

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表 11 混掺多尺度聚丙烯纤维各组钢筋/混凝土管的D_u值

Table 11. D_u value of each group of reinforced concrete with multi-scale polypropylene fibers

Pipe code	FPF1+FPF2+CPF content/(kg·m⁻³)	λ_i+λ_j+λ_k	E_c/MPa	f_c/MPa	ε_c/10⁻⁶	α_c	f_t/MPa	ε_t/10⁻⁶	α_t	D_u/(N·m⁻¹·mm⁻¹)
CPF-S/C	0.0+0.0+6.0	0.00+0.00+0.39	43 600	52.28	2 607.8	0.31	3.20	165.8	1.38	252.94
FPF1-FPF2-CPF-S/C-5.8	0.1+0.1+5.8	0.08+0.02+0.38	44 519	49.60	2 692.2	0.22	3.30	176.3	1.50	255.54
FPF1-FPF2-CPF-S/C-5.6	0.2+0.2+5.6	0.16+0.04+0.37	44 816	48.23	2 770.7	0.16	3.37	186.6	1.58	258.44
FPF1-FPF2-CPF-S/C-5.4	0.3+0.3+5.4	0.24+0.06+0.36	44 543	48.16	2 843.4	0.12	3.40	196.6	1.61	262.78
FPF1-FPF2-CPF-S/C-5.2	0.4+0.4+5.2	0.32+0.08+0.34	43 821	49.96	2 912.0	0.12	3.40	206.0	1.59	265.45
FPF1-FPF2-CPF-S/C-5	0.5+0.5+5.0	0.40+0.10+0.33	42 631	52.65	2 973.6	0.14	3.37	215.4	1.54	263.47
FPF1-FPF2-CPF-S/C	0.6+0.6+4.8	0.48+0.13+0.32	40 792	56.43	3 018.4	0.12	3.32	224.5	1.40	262.75
FPF1-FPF2-CPF-S/C-4.6	0.7+0.7+4.6	0.56+0.15+0.30	39 076	63.10	3 072.8	0.21	3.23	232.8	1.27	259.01
FPF1-FPF2-CPF-S/C-4.4	0.8+0.8+4.4	0.64+0.17+0.29	36 880	70.14	3 118.3	0.29	3.11	241.4	1.11	253.01
FPF1-FPF2-CPF-S/C-4.2	0.9+0.9+4.2	0.72+0.19+0.28	34 478	78.50	3 157.8	0.40	2.97	249.8	0.94	251.45

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