聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟

刘晋铭; 张寿松; 周亭; 尹青; 谢伟

doi:10.13801/j.cnki.fhclxb.20220901.002

聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟

doi: 10.13801/j.cnki.fhclxb.20220901.002

刘晋铭^1,,
张寿松²,
周亭¹,
尹青¹,
谢伟^1, ,

1.
军事科学院国防工程研究院，北京 100036
2.
天津大学　建筑工程学院，天津 300354

基金项目: 国家自然科学基金(51709200)

详细信息

通讯作者:
谢伟，本科，高级工程师，硕士生导师，研究方向为结构工程　E-mail: xieweixiongqi@163.com

中图分类号: TU528；TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-17
- 修回日期: 2022-08-22
- 录用日期: 2022-08-25
- 网络出版日期: 2022-09-02
- 刊出日期: 2023-06-15

Influence of polyvinyl alcohol and ultrahigh molecular weight polyethylene fibers on dynamic mechanical properties of coral aggregate concrete and numerical simulation

1.
Defense Engineering Institute, AMS, Beijing 100036, China
2.
School of Civil Engineering, Tianjin University, Tianjin 300354, China

Funds: Natural Science Foundation of China (51709200)

摘要

摘要: 随着海洋资源的不断开发利用，在岛礁上就地取材制备全珊瑚混凝土已经成为岛礁工程建设与防护的关键技术。为探究不同有机非金属纤维掺量对全珊瑚混凝土的力学性能的影响，使用分离式霍普金森压杆(SHPB)试验研究其动态力学性能并采用LS-DYNA软件对冲击过程进行数值模拟。结果表明：当有机纤维质量分数为1.2wt%时，全珊瑚混凝土的静态抗压强度可达到113 MPa，相比未掺纤维的珊瑚混凝土增长了约7.5%。动态试验下，在应变率为120 s⁻¹时动态抗压强度可达到247 MPa，比未掺加纤维的试样提高约32.6%。全珊瑚混凝土的韧性指标也随着有机纤维掺量的增加而增大。此外，随着有机纤维掺量的增加，珊瑚混凝土试件在相同冲击条件下完整性越高。动态强度试验值与模拟值的误差7%在允许误差内。
- 有机纤维 /
- 全珊瑚混凝土 /
- SHPB /
- 抗压强度 /
- 应变率
Abstract: With the continuous exploitation of marine resources, the preparation of in-situ all-coral concrete on islands and reefs has become a key technology for the construction and protection of island projects. In order to investigate the effect of different organic non-metallic fiber admixture on the mechanical properties of all-coral concrete, the dynamic mechanical properties were investigated by using the Split Hopkinson Pressure bar (SHPB) test and the impact process was numerically simulated by LS-DYNA. The results show that the static compressive strength of all-coral concrete can reach 113 MPa when the organic fiber mass percent is 1.2wt%, which is an increase of about 7.5% compared with the coral concrete without fiber dosing. Under the dynamic test, the dynamic compressive strength can reach 247 MPa at a strain rate of 120 s⁻¹, which is about 32.6% higher than that of the specimens without fiber admixture. The toughness index of all-coral concrete also increases with the increase of organic fiber admixture. In addition, the integrity of coral concrete specimens increases under the same impact conditions with the increase of organic fiber admixture. The error between dynamic strength test values and simulated values is 7% to be within the allowable error.
- organic fiber /
- coral concrete /
- SHPB /
- compressive strength /
- strain rate

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图 1 不同粒径珊瑚集料

Figure 1. Coral aggregates with different particle sizes

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图 2 混凝土试样

Figure 2. Concrete specimens

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图 3 50 mm直锥变截面分离式霍普金森压杆(SHPB)装置示意图

Figure 3. Split hopkinson pressure bar (SHPB) diagram of 50 mm straight cone variable cross-section

v—Velocity

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图 4 典型的力平衡图

Figure 4. Dynamic force balance for a typical text

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图 5 应变率-时程曲线

Figure 5. Strain rate-time history curve

t₀—Starting time of the constant loading platform segment; t₁—Ending time of the constant loading platform segment

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图 6 PVA-UHMWPE/全珊瑚混凝土试件破坏形态

Figure 6. Failure modes of PVA-UHMWPE/coral aggregate concrete specimens

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图 7 PVA-UHMWPE/全珊瑚混凝土应力-应变曲线

Figure 7. Stress-strain curve of PVA-UHMWPE/coral aggregate concrete

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图 8 PVA-UHMWPE/全珊瑚混凝土动态压缩强度(a)和动态增长因子(b)随应变率的变化关系

Figure 8. Variation of dynamic compressive strength (a) and dynamic increase factor (b) with strain rate for PVA-UHMWPE/coral aggregate concrete

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图 9 混凝土韧性计算示意图

Figure 9. Schematic diagram of the calculation for toughness of concrete

T—Toughness

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图 10 PVA-UHMWPE/全珊瑚混凝土韧性指标随纤维质量分数变化关系

Figure 10. Variation of toughness index of PVA-UHMWPE/coral aggregate concrete with the mass percent of organic fiber

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图 11 PVA-UHMWPE/全珊瑚混凝土有限元计算模型

Figure 11. Finite element calculation model of PVA-UHMWPE/coral aggregate concrete

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图 12 PVA-UHMWPE/全珊瑚混凝土应力-应变试验与模拟曲线

Figure 12. Stress-strain test and simulation curves of PVA-UHMWPE/coral aggregate concrete

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图 13 PVA-UHMWPE/全珊瑚混凝土不同应变率下破坏形态的数值模拟与实验结果

Figure 13. Numerical and experimental results of failure modes for PVA-UHMWPE/coral aggregate concretes under different strain rates

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表 1 目标混凝土配合比

Table 1. Mixing ratio of designed concrete

Cement/ (kg·m⁻³)	Micro-silica/ (kg·m⁻³)	Slag/ (kg·m⁻³)	Cenos-phere/ (kg·m⁻³)	A₁/ (kg·m⁻³)	A₂/ (kg·m⁻³)	A₃/ (kg·m⁻³)	Fiber mass percent/wt%	Mixed water/ (kg·m⁻³)	Water reducing agent/(kg·m⁻³)
567	230	140	63	240	640	120	0, 0.6, 1.2	220	2.2
Notes: A₁—Coral fine sand (0.075-0.3 mm); A₂—Coral medium sand (0.3-0.6 mm); A₃—Coral coarse sand (0.6-1.18 mm).

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表 2 不同纤维质量分数的PVA-UHMWPE/全珊瑚混凝土的力学参数

Table 2. Mechanical parameters of PVA-UHMWPE/coral aggregate concrete with different fiber mass percent

Fiber mass fraction/wt%	f_cs/MPa	E_s/GPa	Strain rate/s⁻¹	f_D	Dynamic compressive strength/MPa	Dynamic peak strain/10⁻³
0	105.31	35.78	53.6	1.22	128.56	5.6
			69.4	1.44	152.89	5.7
			126.9	1.78	187.04	6.4
0.6	108.26	36.21	63.7	1.36	147.16	5.3
			105.5	1.76	191.06	5.4
			140.9	1.84	199.70	6.1
1.2	113.24	37.56	69.8	1.39	157.49	5.3
			101.6	1.86	210.44	6.7
			137.1	2.19	247.99	6.9
Notes: f_cs—Static compressive strength; E_s—Static modulus of elasticity; f_D—Dynamic increase factor.

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表 3 PVA-UHMWPE/全珊瑚混凝土的HJC本构模型参数

Table 3. HJC model parameters for PVA-UHMWPE/coral aggregate concrete

$ \rho $/(kg·m⁻³)	E_s/GPa	A	B	C	N	S_{f, max}	f_cs/MPa
2200	35.78	0.79	1.60	0.007	0.61	7	105.31
T/MPa	S₀	ε_{f, min}	P_c/MPa	U_c	P_l/GPa	U_l	D₁
6.36	1	0.01	35.10	0.001	0.8	0.11	0.04
D₂	K₁/GPa	K₂/GPa	K₃/GPa
1.0	85	171	208
Notes: ρ—Density; E_s—Elastic modulus; A, B, N, C, S_{f, max}—Strength parameter; f_cs—Static compressive strength; T—Tensile strength; S₀—Reference strain rate; ε_{f, min}—Minimum plastic strain; P_c—Crushing pressure; U_c—Crushing volumetric strain; P_l—Locking pressure; U_l—Volumetric strain at the locking pressure P_l; D₁, D₂—Damage constants; K₁, K₂, K₃—Pressure constants.

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表 4 PVA-UHMWPE/全珊瑚混凝土试验值与数值模拟值对比

Table 4. Comparison of experimental and numerical simulation values for PVA-UHMWPE/coral aggregate concretes

Fiber mass fraction/wt%	Strain rate/s⁻¹	Compressive strength/MPa		Absolute value of error/MPa
Fiber mass fraction/wt%	Strain rate/s⁻¹	Test value	Simulation value	Absolute value of error/MPa
0	53.6	128.56	122.24	6.32
	69.4	152.89	159.66	6.77
	126.9	187.04	169.42	17.62
0.6	63.7	147.16	153.13	5.97
	105.5	191.06	180.77	10.29
	140.9	199.70	197.83	1.87
1.2	69.8	157.49	164.60	7.11
	101.6	210.44	198.62	11.82
	137.1	247.99	247.39	0.60

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