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Reduced order models for the buckling and vibration analyses of pultruded FRP angle section columns

Pires Filho, Leyser P. ; Gonçalves, Paulo B.

Engineering structures, 2024-07, Vol.311, p.118145, Article 118145 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Reduced order models for the buckling and vibration analyses of pultruded FRP angle section columns
  • Autor: Pires Filho, Leyser P. ; Gonçalves, Paulo B.
  • Assuntos: Equal and unequal-leg angle sections ; Fiber-reinforced polymer (FRP) pultruded columns ; Stability analysis ; Thin-walled columns ; Vibration analysis
  • É parte de: Engineering structures, 2024-07, Vol.311, p.118145, Article 118145
  • Descrição: Open section fiber reinforced polymer (FRP) pultruded elements have been widely employed in engineering. However, due to their orthotropic properties there is a need for appropriate design rules. Among common open sections, angles feature a simple geometry but exhibit a complex buckling and dynamic behavior, requiring qualitative and quantitative analyses to investigate the influence of geometric and material parameters on their buckling and vibration dominant modes. This work studies the buckling and vibration characteristics of pultruded FRP angle sections considering short to long equal-leg and unequal-leg columns. The angle is modelled as two plates employing the von Kármán plate theory and considering the continuity at the common boundary, and reduced order models (ROMs) are developed. First, the GBTul software is used to investigate the modal participation in buckling and vibration modes as a function of geometry. Then, the displacement field for each ROM is analytically derived and used to discretize the system by the Rayleigh-Ritz method and Hamilton's principle is employed to derive the suitable eigenvalue problems. Detailed parametric dimensional and nondimensional analyses are conducted and the obtained critical loads and vibration frequencies are favorably compared in each case with the GBTul results. Thus, the present work sheds new light on angle buckling and vibration mechanisms and may serve as a guide for theoretical developments and design issues. •Buckling and vibration analysis of composite FRP angles employing plate theory.•Analysis of modal participation in the critical load and natural frequencies of FRP equal- and unequal-leg sections.•Derivation of reduced order models (ROMs) covering typical buckling and vibration phenomena of FRP columns, favorably compared against GBTul software.•Influence of geometrical and material parameters on the critical load and fundamental frequency.•Influence of modal coupling of weak and strong-axis flexural modes with torsional mode as a function of the angle width ratio.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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