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纤维增强塑料-聚氯乙烯约束自燃矸石混凝土柱的应力-应变特性

Stress-strain characteristics of FRP-PVC confined spontaneous combustion gangue concrete columns.

作者信息

Zhang Jinyang, Liu Haiqing, Wang Jinli, Lei Ming, Chen Zimu

机构信息

School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China.

China Construction Fifth Engineering Division Corp., Ltd., Changsha, 410004, China.

出版信息

Sci Rep. 2024 Jan 17;14(1):1482. doi: 10.1038/s41598-024-51928-5.

DOI:10.1038/s41598-024-51928-5
PMID:38233451
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10794696/
Abstract

A total of 40 fiber reinforced polymer (FRP) and polyvinyl chloride (PVC) confined spontaneous combustion gangue coarse-aggregate concrete (SAC) specimens were subjected to axial compression tests and theoretical studies. The main analysis focused on the impact of the replacement rate of spontaneous combustion gangue (SCG), the type of CFRP confinement, and the number of CFRP layers on the axial compression performance of CFRP-PVC confined SAC (CFRP-PVC-SAC). The results show that CFRP-PVC confinement can effectively enhance the axial compressive capacity, axial deformation, and lateral deformation of the components. The increase in strength ranges from 1.68 to 3.48 times, while the increase in strain ranges from 5.21 to 11.98 times. The crack patterns and expansive behavior of the coal gangue concrete under confinement exhibit significant differences compared to ordinary concrete. In addition, based on the framework of the existing FRP-confined plain concrete model, a modified model is established to facilitate prediction of stress-strain relationships for short columns of CFRP-PVC-SAC, with the calculated results in good agreement with experimental values.

摘要

总共40个纤维增强聚合物（FRP）和聚氯乙烯（PVC）约束自燃煤矸石粗骨料混凝土（SAC）试件进行了轴向压缩试验和理论研究。主要分析集中在自燃煤矸石（SCG）替代率、CFRP约束类型以及CFRP层数对CFRP - PVC约束SAC（CFRP - PVC - SAC）轴向压缩性能的影响。结果表明，CFRP - PVC约束能有效提高构件的轴向抗压能力、轴向变形和横向变形。强度提高幅度为1.68至3.48倍，应变提高幅度为5.21至11.98倍。约束下煤矸石混凝土的裂缝形态和膨胀行为与普通混凝土相比有显著差异。此外，基于现有FRP约束素混凝土模型的框架，建立了一个修正模型，以方便预测CFRP - PVC - SAC短柱的应力 - 应变关系，计算结果与试验值吻合良好。

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