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

doi:10.19936/j.cnki.2096-8000.20240628.006

Abstract

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

CLC Number:

TB332

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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