带金属挤压套管铰接连接FRP轴心压杆整体屈曲性能研究

doi:10.19936/j.cnki.2096-8000.20240628.006

复合材料科学与工程 ›› 2024, Vol. 0 ›› Issue (6): 41-47.DOI: 10.19936/j.cnki.2096-8000.20240628.006

带金属挤压套管铰接连接FRP轴心压杆整体屈曲性能研究

徐江洪, 张冬冬^*, 邵飞, 高一峰, 白林越, 吕晨曦

陆军工程大学野战工程学院,南京 210007

收稿日期:2023-06-12 出版日期:2024-06-28 发布日期:2024-07-26
通讯作者: 张冬冬(1986—),男,博士,副教授,博士生导师,研究方向为应急桥梁设计理论与关键技术、复合材料结构与力学,zhangdodo_163@163.com。
作者简介:徐江洪(1998—),男,硕士研究生,研究方向为复合材料结构。
基金资助:
国家自然科学基金(52278230,52008390);江苏省自然科学基金(BK20221531)

Research on the overall buckling performance of FRP profiles with hinged metal extruded sleeve joints subjected to axial compression loads

XU Jianghong, ZHANG Dongdong^*, SHAO Fei, GAO Yifeng, BAI Linyue, LÜ Chenxi

College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China

Received:2023-06-12 Online:2024-06-28 Published:2024-07-26

摘要/Abstract

摘要： 本文针对拼装式桁架结构中两端设有金属挤压套管连接的FRP受压杆件,通过轴向压缩试验和有限元分析方法研究了此类组合杆件两端铰接时的整体屈曲性能,并通过参数化分析揭示了金属连接段对不同长度FRP杆件屈曲临界承载力的影响规律。基于试验和有限元结果,对目前工程中常用的五种FRP杆件整体屈曲临界承载力计算公式进行了比较验证,明确了适用于此类组合杆件整体屈曲临界承载力的计算方法。结果表明:相比于未设置端部金属加强段的杆件,FRP圆管在金属外套管端部发生剪切断裂,而非杆件中部断裂,即金属外套管局部构造对杆件整体破坏模式有较大影响。另外,端部设有金属段的杆件整体临界屈曲荷载得到了一定提升;随着长细比的增加,端部金属区段对FRP杆件整体屈曲临界荷载影响的增幅逐渐减小。建议采用Engesser或Haringx修正公式作为两端设有挤压型金属套管铰接连接的FRP压杆的设计计算公式。

关键词: 复合材料, 拼装式桁架, 拉挤型FRP压杆, 挤压套管连接, 整体稳定性, 屈曲临界荷载

Abstract: This article focuses on FRP compression profiles with end hinged metal extruded sleeve joints in assembled truss structures. The overall buckling performance of these hybrid members was studied through axial compression tests and finite element methods. The influence of metal joint segments on the critical buckling bearing capacity of FRP profiles of different lengths was revealed by parametric analysis. In addition, based on the experimental and finite element results, the formulas for calculating the global buckling critical bearing capacity of five kinds of FRP profiles commonly used in engineering were compared and verified, and the calculation method suitable for the global critical buckling capacity of such FRP profiles was determined. The results show that compared to FRP profiles without end extruded metal sleeve joints, the FRP tube undergo shear fracture at the end of the metal outer sleeve, rather than at the middle of the FRP tube, i.e., the local structure of the end metal extruded sleeve joints has a significant impact on the failure mode of the FRP compression profiles. The overall critical buckling load of FRP profiles with end metal joints is improved to a certain extent. With the increase of slenderness ratio, the increase of influence of end-metal segment on the critical buckling load of FRP profiles decreases gradually. It is suggested that Engesser or Haringx modified formula can be used as the design formula for FRP compression profiles with end hinged extruded metal sleeve joints.

Key words: composites, assembled truss, pultruded FRP compression profiles, extruded sleeve joint, global stability, critical buckling load

中图分类号:

TB332

徐江洪, 张冬冬, 邵飞, 高一峰, 白林越, 吕晨曦. 带金属挤压套管铰接连接FRP轴心压杆整体屈曲性能研究[J]. 复合材料科学与工程, 2024, 0(6): 41-47.

XU Jianghong, ZHANG Dongdong, SHAO Fei, GAO Yifeng, BAI Linyue, LÜ Chenxi. Research on the overall buckling performance of FRP profiles with hinged metal extruded sleeve joints subjected to axial compression loads[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(6): 41-47.

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带金属挤压套管铰接连接FRP轴心压杆整体屈曲性能研究

Research on the overall buckling performance of FRP profiles with hinged metal extruded sleeve joints subjected to axial compression loads

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