中国塑料 ›› 2025, Vol. 39 ›› Issue (8): 55-61.DOI: 10.19491/j.issn.1001-9278.2025.08.009

• 加工与应用 • 上一篇    下一篇

氯盐冻融作用下损伤GFRP管混凝土柱轴压性能试验研究

金清平1(), 曾东垚1, 刘运蝶2   

  1. 1.武汉科技大学城市建设学院,武汉 430065
    2.哈尔滨铁道职业技术学院,哈尔滨 150066
  • 收稿日期:2024-09-10 出版日期:2025-08-26 发布日期:2025-07-30
  • 作者简介:金清平(1975—),男,教授,从事FRP土木工程结构与性能研究,jinqingping@wust.edu.cn

Experimental study on axial compression performance of GFRP pipe concrete columns damaged under chloride salt freeze⁃thaw action

JIN Qingping1(), ZENG Dongyao1, LIU Yundie2   

  1. 1.School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China
    2.Harbin Railway Technical College,Harbin 150066,China
  • Received:2024-09-10 Online:2025-08-26 Published:2025-07-30

摘要:

通过对24个玻璃纤维增强聚合物(GFRP)管混凝土(CFFT)柱在3.5 %(质量分数,下同)的氯化钠溶液中进行冻融循环试验,在此之前,对12个CFFT柱进行了切割初始损伤,研究在氯盐冻融作用下切割损伤后CFFT柱轴压性能,评估氯盐冻融作用下损伤CFFT柱轴压强度衰减情况。结果表明:损伤CFFT柱较无损CFFT柱进入征兆期更早,2种CFFT柱在轴压作用下的荷载⁃应变曲线趋势一致,均为双线性曲线,随着冻融次数的增加,试件极限应变值下降,延性变差;相同冻融次数下,损伤CFFT柱初始刚度、延性更差,极限承载力均下降了200 kN左右;

关键词: 玻璃纤维增强聚合物管混凝土柱, 冻融循环, 氯盐环境, 切割损伤, 轴压性能

Abstract:

This study investigates the axial compression performance of glass⁃fiber⁃reinforced polymer (GFRP)⁃reinforced concrete (CFFT) columns subjected to chloride freeze⁃thaw cycles, with a focus on the effects of initial cutting damage. A total of 24 CFFT columns were tested in a 3.5 wt% sodium chloride solution, half of which were precut to simulate initial damage. Results indicated that damaged CFFT columns entered the symptom period earlier than undamaged columns. Both types of columns exhibited bilinear load⁃strain curves under axial compression. However, as freeze⁃thaw cycles increased, the ultimate strain decreased, and ductility deteriorated. Compared to undamaged columns, the damaged ones demonstrated reduced initial stiffness, lower ductility, and an approximate 200 kN decrease in ultimate bearing capacity under the same freeze⁃thaw conditions. These findings highlight the significant impact of initial damage on the durability and mechanical performance of CFFT columns in corrosive freeze⁃thaw environments.

Key words: concrete?filled glass?fiber?reinforced polymer tube column, freeze?thaw cycle, chlorine salt environment, cutting damage, axial compression performance

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