带外包纤维增强塑料约束混凝土芯的组合混凝土柱的抗压性能

Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores.

作者信息

Wang Xuxu, Qi Yujun, Sun Yunlou, Xie Zhijin, Liu Weiqing

机构信息

College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China.

College of Civil Engineering, Southeast University, Nanjing 210096, China.

出版信息

Sensors (Basel). 2019 Apr 15;19(8):1792. doi: 10.3390/s19081792.

DOI:10.3390/s19081792

PMID:30991644

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6515226/

Abstract

A composite concrete column with encased fiber reinforced polymer (FRP) confined concrete cores (EFCCC) is proposed in this paper. The cross-sectional form of the EFCCC column is composed of several orderly arranged FRP confined concrete cores (FCCCs) surrounding a filled core concrete. This novel composite column has several advantages, such as higher compressive capacity, stronger FRP confinement, and ductile response. The compressive experiment is employed to investigate the compressive behavior of the EFCCC column with deferent parameters, such as outside concrete and stirrups. Test results show that the main failure mode of the EFCCC column with and without an outside concrete or stirrups is tensile fracture of the glass fiber reinforced polymer (GFRP) tubes. Compared to a reinforced concrete (RC) column, the strength and ductility of the EFCCC column was obviously improved by 20% and 500%, respectively. A finite element model (FEM) based on the Drucker-Prager (D-P) was developed that can accurately predict the axial compression behavior of the composite column with FRP confined concrete core. The predicted results obtained by using this FEM have excellent agreement with the experimental results.

摘要

本文提出了一种内置纤维增强聚合物（FRP）约束混凝土芯的组合混凝土柱（EFCCC）。EFCCC柱的横截面形式由围绕填充芯混凝土有序排列的多个FRP约束混凝土芯（FCCC）组成。这种新型组合柱具有诸多优点，如更高的抗压能力、更强的FRP约束以及延性响应。采用抗压试验研究了不同参数（如外部混凝土和箍筋）对EFCCC柱抗压性能的影响。试验结果表明，有或无外部混凝土或箍筋的EFCCC柱的主要破坏模式是玻璃纤维增强聚合物（GFRP）管的拉伸断裂。与钢筋混凝土（RC）柱相比，EFCCC柱的强度和延性分别明显提高了20%和500%。建立了基于Drucker-Prager（D-P）的有限元模型（FEM），该模型能够准确预测内置FRP约束混凝土芯组合柱的轴向受压性能。使用该有限元模型得到的预测结果与试验结果吻合良好。