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

doi:10.19936/j.cnki.2096-8000.20221228.008

Abstract

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

CLC Number:

TB332

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.

References

[1] 吴智深, 汪昕, 吴刚. FRP增强工程结构体系[M]. 北京: 科学出版社, 2017.
[2] BARBERO E J, RAFTOYIANNIS I G. Euler buckling of pultruted composite columns[J]. Composite Structures, 1993, 24(2): 139-47.
[3] 叶列平, 冯鹏. FRP在工程结构中的应用与发展 [J]. 土木工程学报, 2006(3): 24-36.
[4] BAKIS C E, BANK L C, BROWN V L, et al. Fiber-reinforced polymer composites for construction-state-of-the-art review[J]. Journal of Composites for Construction, 2002, 6(2): 73-87.
[5] HAMILTON H R, BENMOKRANE B, DOLAN C W, et al. Polymer materials to enhance performance of concrete in civil infrastructure[J]. Polymer Reviews, 2009, 49(1): 1-24.
[6] HOLLAWAY L C. A review of the present and future utilisation of FRP composites in the civil infrastructure with reference to their important in-service properties[J]. Construction and Building Materials, 2010, 24(12): 2419-2445.
[7] ZHAN Y, WU G, YANG L S. Experimental investigation of the behavior of a lattice steel column repaired with pultruded GFRP Profiles[J]. Journal of Performance of Constructed Facilities, 2015, 29(4): 1-13.
[8] TOMBLIN J, BARBERO E. Local buckling experiments on FRP columns[J]. Thin-Walled Structures, 1994, 18(2): 97-116.
[9] BARBERO E, TOMBLIN J. A phenomenological design equation for FRP columns with interaction between local and global buckling[J]. Thin-Walled Structures, 1994, 18(2): 117-131.
[10] KOLLAR L P. Local buckling of fiber reinforced plastic composite structural members with open and closed cross sections[J]. Journal of Structural Engineering-Asce, 2003, 129(11): 1503-1513.
[11] KOLLAR L P. Buckling of unidirectionally loaded composite plates with one free and one rotationally restrained unloaded edge[J]. Journal of Structural Engineering-Asce, 2002, 128(9): 1202-1211.
[12] QIAO P Z, ZOU G P. Local buckling of composite fiber-reinforced plastic wide-flange sections[J]. Journal of Structural Engineering-Asce, 2003, 129(1): 125-129.
[13] QIAO P Z, ZOU G P. Local buckling of elastically restrained fiber-reinforced plastic plates and its application to box sections[J]. Journal of Engineering Mechanics-Asce, 2002, 128(12): 1324-1330.
[14] CARDOSO D C T, HARRIES K A, BATISTA E D M. Closed-form equations for compressive local buckling of pultruded thin-walled sections[J]. Thin-Walled Structures, 2014, 79: 16-22.
[15] SMERDOV A A. A computational study in optimum formulations of optimization problems on laminated cylindrical shells for buckling Ⅰ. Shells under axial compression[J]. Composites Science and Technology, 2000, 60(11): 2057-2066.
[16] PECCE M, COSENZA E. Local buckling curves for the design of FRP profiles[J]. Thin-Walled Structures, 2000, 37(3): 207-222.
[17] STRONGWELL C. Strongwell design manual[Z]. Strongwell Corporation, Bristol,Virginia, USA: 2007.
[18] CREATIVE PULTRUSION INC. The Pultex pultrusion global design manual of standard and custom fiber reinforcedpolymer structural profiles[Z]. The Creative Pultrusion Inc., PA: 2000.
[19] 复合材料拉挤型材结构技术规程: T/CECS 692—2020[S]. 北京: 中国建筑工业出版社, 2020.
[20] 詹瑒. 纤维增强复合材料(FRP)格构柱基本性能研究[D]. 南京: 东南大学, 2016.
[21] 詹瑒, 李奔奔, 崔璟, 等. 双轴对称截面FRP轴心受压杆件整体屈曲临界力计算方法分析[J]. 复合材料科学与工程, 2021(6): 58-64.