中国塑料 ›› 2025, Vol. 39 ›› Issue (7): 56-62.DOI: 10.19491/j.issn.1001-9278.2025.07.010

• 加工与应用 • 上一篇    下一篇

高温对GFRP管混凝土柱轴压性能影响研究

高永红(), 何家乐, 金清平   

  1. 武汉科技大学城市建设学院,武汉 430065
  • 收稿日期:2024-08-04 出版日期:2025-07-26 发布日期:2025-07-22
  • 作者简介:高永红(1967—),女,副教授,从事FRP土木工程结构与性能研究,gaoyonghong@wust.edu.cn
  • 基金资助:
    湖北省建设厅科研资助项目(厅头〔2022〕2198号?67);湖北省高等学校优秀中青年科技创新团队计划项目(T2022002)

Effect of elevated temperatures on axial compressive performance of concrete⁃filled GFRP tube columns

GAO Yonghong(), HE Jiale, JIN Qingping   

  1. School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China
  • Received:2024-08-04 Online:2025-07-26 Published:2025-07-22

摘要:

为研究高温环境对玻璃纤维增强聚合物(GFRP)管混凝土柱轴压性能的影响,试验在20~220 ℃的温度范围内对两种规格的GFRP管、混凝土立方体和GFRP管混凝土柱进行2 h和4 h的加热处理,通过分析GFRP管的环向拉伸性能、轴向压缩性能及混凝土立方体强度,揭示这些材料在高温条件下的性能变化及其对GFRP管混凝土柱轴压性能的影响。结果表明,常温下GFRP管混凝土柱的极限抗压承载力比素混凝土柱显著提高了4.75倍,随着温度升高,GFRP管和混凝土的变形协调性变差,力学性能发生退化,导致GFRP管混凝土柱的极限承载力和极限应变逐渐下降,特别是在220 ℃时,加热2 h和4 h后,GFRP管混凝土柱的极限承载力分别下降了18.73 %和20.21 %。加热温度上升对GFRP管混凝土柱轴压性能的影响比高温作用时间更为明显。

关键词: 玻璃纤维增强聚合物管混凝土柱, 高温, 轴压性能, 极限承载力, 约束作用

Abstract:

This study examined the effects of elevated temperatures (20⁃220°C) on the axial compressive behavior of concrete⁃filled glass fiber reinforced polymer (GFRP) tubular columns. Experimental investigations were conducted on GFRP tubes, concrete cubes, and composite columns with two different specifications, subjected to heating durations of 2 and 4 hours. The study evaluated circumferential tensile properties of GFRP tubes, compressive strength of concrete, and their combined influence on column performance. Results indicated that at ambient temperature, GFRP confinement enhanced the ultimate bearing capacity of concrete columns by 4.75 times compared to unconfined specimens. However, elevated temperatures significantly degraded the mechanical compatibility between GFRP tubes and concrete, leading to progressive reductions in both ultimate bearing capacity and strain. At 220 ℃, the bearing capacity decreased by 18.73 % (2⁃hour exposure) and 20.21 % (4⁃hour exposure). Temperature elevation proved more detrimental to axial performance than exposure duration, highlighting the importance of thermal considerations in GFRP⁃confined concrete column design.

Key words: concrete?filled GFRP tube column, elevated temperature, axial compressive performance, ultimate compressive capacity, confinement effect

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