等边角形纤维增强复合材料型材轴压性能试验研究

doi:10.19936/j.cnki.2096-8000.20221228.008

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (12): 62-68.DOI: 10.19936/j.cnki.2096-8000.20221228.008

等边角形纤维增强复合材料型材轴压性能试验研究

陈健¹, 孙泽阳¹, 詹瑒², 罗佑健³, 曾以华^1*

1.东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189;
2.南京工程学院建筑工程学院,南京211167;
3.深圳市市政工程总公司,深圳518109

收稿日期:2021-11-09 发布日期:2023-02-03
通讯作者: 曾以华(1987-),男,博士,主要从事结构工程方面的研究,yihua.zeng@foxmail.com。
作者简介:陈健(1996-),男,硕士研究生,主要从事复合材料型材在土木工程中的应用研究。
基金资助:
国家自然科学基金(51778130);江苏省自然科学基金(BK20180393)

Experimental study on the critical force of local buckling of GFRP equilateral angular members under axial compression

CHEN Jian¹, SUN Ze-yang¹, ZHAN Yang², LUO You-jian³, ZENG Yi-hua^1*

1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China;
2. School of Civil Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
3. Shenzhen Municipal Engineering Corporation, Shenzhen 518109, China

Received:2021-11-09 Published:2023-02-03

摘要/Abstract

摘要： 纤维增强复合材料(FRP)刚度相对其强度较低,故FRP轴压构件一般是由屈曲承载力控制而不是由材料的抗压强度控制。为研究等边角形GFRP型材的轴压局部稳定性能,选取了15个试件进行试验,将试验结果与有限元模型进行对比,并对现有的几种局部屈曲理论方法计算精度进行评估。结果表明:对于GFRP角形轴压构件,其局部失稳破坏位置大多在端部附近,试件端部纤维被拉断,出现分层现象。有限元计算结果与试验结果吻合良好,表明所建立的有限元模型可以对等边角形GFRP型材局部稳定性能进行较好模拟,且端部约束条件对构件的局部屈曲承载力有显著影响;GFRP长柱的屈曲稳定主要由构件长细比来控制,而短柱的屈曲稳定主要由宽厚比来控制。比较现有的局部屈曲理论计算方法发现,《复合材料拉挤型材结构技术规程》建议的方程可以较好地预测等边角形截面FRP杆件局部屈曲临界力。

关键词: GFRP, 等边角形构件, 局部屈曲, 试验研究, 有限元模型, 预测评估

Abstract: The stiffness of fiber-reinforced composite materials (FRP) is relatively low relative to its strength, so FRP axial compression members are generally controlled by the buckling bearing capacity rather than the compressive strength of the materials. In order to study the local stability performance of equilateral angular GFRP profiles under axial compression, 15 specimens were selected for testing, the test results were compared with the finite element model, and the calculation accuracy of several existing local buckling theoretical methods was evaluated. The results show that for GFRP angular axial compression members, the local instability failure position is mostly near the end, and the fiber at the end of the test piece is broken and delamination occurs. The finite element calculation results are in good agreement with the experimental results, indicating that the established finite element model can better simulate the local stability of equilateral angular GFRP profiles, and the end constraint conditions have a significant impact on the local buckling bearing capacity of the member. The buckling stability of the column is mainly controlled by the slenderness ratio of the member, while the buckling stability of the short column is mainly controlled by the width-to-thickness ratio. Comparing the existing calculation methods of local buckling theory, it is found that the equation proposed in Technical Specification for Composite Pultrusion Section Structures can better predict the local buckling critical force of equilateral angular cross-section FRP members.

Key words: GFRP, equilateral angle profile, local buckling, experimental research, finite element model, predictive evaluation

中图分类号:

TB332

陈健, 孙泽阳, 詹瑒, 罗佑健, 曾以华. 等边角形纤维增强复合材料型材轴压性能试验研究[J]. 复合材料科学与工程, 2022, 0(12): 62-68.

CHEN Jian, SUN Ze-yang, ZHAN Yang, LUO You-jian, ZENG Yi-hua. Experimental study on the critical force of local buckling of GFRP equilateral angular members under axial compression[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(12): 62-68.

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等边角形纤维增强复合材料型材轴压性能试验研究

Experimental study on the critical force of local buckling of GFRP equilateral angular members under axial compression

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