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天然亚麻和玻璃纤维增强复合材料约束混凝土的动态劈裂拉伸性能

Dynamic Splitting Tensile Behaviour of Concrete Confined by Natural Flax and Glass FRP.

作者信息

Wang Wenjie, Mo Zonglai, Zhang Yunpeng, Chouw Nawawi

机构信息

Jiangsu Key Laboratory of Engineering Mechanics, School of Civil Engineering, Southeast University, Nanjing 211189, China.

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

出版信息

Polymers (Basel). 2022 Oct 19;14(20):4424. doi: 10.3390/polym14204424.

DOI:10.3390/polym14204424
PMID:36298002
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9611135/
Abstract

Flax fibre has been used to reinforce concrete composite, but its dynamic properties have not been thoroughly studied. This study investigates the dynamic splitting tensile properties of plain concrete (PC) confined by flax-fibre-reinforced polymer (FFRP) and glass-fibre-reinforced polymer (GFRP). The dynamic splitting tensile tests were carried out on PC, FFRP-PC, and GFRP-PC cylinder specimens by the high-speed servo-hydraulic machine, with the impact-induced strain rates ranging from 0.1 to 58 s. The effect of the FRP confinement, FRP thickness and strain rate on the dynamic splitting tensile behaviour were assessed. The results indicated that similar confinement effectiveness of FFRP and GFRP is observed. The dynamic tensile strength of 1- and 2-layer FFRP-PC increased by 29% and 67%, and the one- and two-layer GFRP-PC increased by 32% and 84%, respectively. FFRP-PC and GFRP-PC cylinders showed less sensitivity to the strain rate compared with PC. The empirical relationship between the tensile DIF and strain rate for PC, FFRP-PC and GFRP-PC was proposed based on experimental data. The proposed model was developed to predict the dynamic splitting tensile strength. The results suggested the potential of FFRP composites applied into concrete structures under extreme dynamic loadings.

摘要

亚麻纤维已被用于增强混凝土复合材料，但其动态性能尚未得到充分研究。本研究调查了亚麻纤维增强聚合物（FFRP）和玻璃纤维增强聚合物（GFRP）约束下的素混凝土（PC）的动态劈裂抗拉性能。通过高速伺服液压机对PC、FFRP-PC和GFRP-PC圆柱试件进行动态劈裂拉伸试验，冲击引起的应变率范围为0.1至58 s⁻¹。评估了FRP约束、FRP厚度和应变率对动态劈裂拉伸行为的影响。结果表明，FFRP和GFRP具有相似的约束效果。1层和2层FFRP-PC的动态抗拉强度分别提高了29%和67%，1层和2层GFRP-PC分别提高了32%和84%。与PC相比，FFRP-PC和GFRP-PC圆柱体对应变率的敏感性较低。基于实验数据，提出了PC、FFRP-PC和GFRP-PC的抗拉动力强度影响系数（DIF）与应变率之间的经验关系。所提出的模型用于预测动态劈裂抗拉强度。结果表明了FFRP复合材料在极端动态载荷下应用于混凝土结构的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca91/9611135/c86798c541e7/polymers-14-04424-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca91/9611135/c86798c541e7/polymers-14-04424-g014.jpg

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Polymers (Basel). 2022 Mar 21;14(6):1260. doi: 10.3390/polym14061260.
2
Renovation Effect of Flax FRP-Reinforced Cracked Concrete Slabs under Impact Loadings.冲击荷载作用下亚麻纤维增强塑料加固开裂混凝土板的修复效果
Materials (Basel). 2021 Oct 19;14(20):6212. doi: 10.3390/ma14206212.
3
Prediction of Ultimate Strain for Rectangular Reinforced Concrete Columns Confined with Fiber Reinforced Polymers under Cyclic Axial Compression.
纤维增强聚合物约束矩形钢筋混凝土柱在循环轴向压缩下的极限应变预测
Polymers (Basel). 2020 Nov 15;12(11):2691. doi: 10.3390/polym12112691.