Study on anchoring performance of carbon⁃glass⁃fiber⁃reinforced polymer composite rods

doi:10.19491/j.issn.1001-9278.2023.10.003

Abstract

Abstract:

In this paper， the stress distribution and anchoring mechanism of three typical anchoring systems were studied for the anchoring failure of carbon/glass fiber reinforced polymer composite rods. The results indicated that the anchoring capacity of the carbon fiber layer anchoring system was low due to the interfacial debonding and cross⁃section weakening. The mechanical anchoring system easily generated an initial compressive damage and stress concentration for the rod. The adhesive type anchoring system produced a debonding failure due to the low bonding strength of the rod⁃adhesive interface. Aiming at the problems of section weakening， the stress concentration and interfacial debonding existing in the above three anchoring systems， this study proposed a wedge⁃bonded compound anchoring system considering of the wedge extrusion and resin bonding. The results from the finite element simulation and tensile test indicated that the stress distribution in the anchor of the wedge⁃bond compound anchor system was uniform， the rod underwent a burst failure， and there was no slippage in the anchor. The ultimate anchor bearing capacity of the anchor system was 360.1 kN. This effectively solves the anchor failure problem in the composite rods.

Key words: carbon?glass fiber hybrid, composite rod, anchorage performance, finite element simulation, tensile test

CLC Number:

TQ327

SHEN Haijuan, LI Chenggao, GUO Rui, XIN Meiyin, HUANG Xiangyu, ZHANG Zhonghui, XIAN Guijun. Study on anchoring performance of carbon⁃glass⁃fiber⁃reinforced polymer composite rods[J]. China Plastics, 2023, 37(10): 15-23.

Figures/Tables 21

Fig.1. Section of the carbon/glass fiber reinforced hybrid rod

Fig.2. Short beam shear sample of carbon/glass fiber reinforced hybrid rod and test device

Fig.3. Interface shear strength test device for the carbon/glass fiber reinforced hybrid rod

Fig.4. Shear stress⁃displacement curve of the carbon/glass fiber reinforced hybrid rod

Fig.5. Short beam shear failure mode of the carbon/glass fiber reinforced hybrid rod

Fig.6. Interface shear failure mode of the carbon/glass fiber reinforced hybrid rod

Fig.7. Schematic diagram of bonding⁃type anchorage system for the carbon fiber layer

Fig.8. Interface shear failure mode of the carbon/glass fiber reinforced hybrid rod

Fig.9. Microscopic morphology of shell/core interface at the abscission layer

Fig.10. Schematic diagram of wedge⁃type anchorage system for the carbon fiber layer

Fig.11. Failure mode of wedge⁃type anchorage system for the carbon fiber layer

Fig.12. Finite element model of the bolt rod anchorage system

Fig.13. Colored stress patterns of the bolt rod anchorage system

Fig.14. Failure mode of the bolt rod anchorage system

构件名称	弹性模量E1/GPa	泊松比	外径厚度/mm	材料特性
芯层CFRP	170	0.15	12	弹性
皮层GFRP	72	0.20	7	弹性
填充树脂	3.2	0.35	16（直筒）	弹性
填充树脂	3.2	0.35	6~26（梯度）	弹性
锚具钢管	206	0.30	15	弹性

Tab.1. Finite element parameters of straight bond⁃type anchoring system

Fig.15. Stress distribution of the straight bond⁃type anchoring system

Fig.16. Failure mechanism diagrams of different anchoring systems

Fig.17. Design sketch of the wedge⁃bond compound anchoring system

Fig.18. Stress distribution of the wedge⁃bond compound anchoring system

样品编号	极限荷载/kN	拉伸强度/GPa	破坏模式
1^#	371.3	1.31	爆裂
2^#	350.5	1.24	爆裂
3^#	358.5	1.27	爆裂
平均值	360.1	1.27	-
标准差	10.5	0.04	-

Tab.2. Tensile test results of carbon/glass fiber reinforced hybrid rod

Fig.19. Tensile failure mode of the wedge⁃bond compound anchoring system

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