NUMERICAL FAILURE ANALYSIS OF BUILT-UP COLUMNS COMPOSED OF CLOSELY SPACED PULTRUDED FRP CHANNELS Fabio MINGHINI a* , Nerio TULLINI a , Francesco ASCIONE b , Luciano FEO b a Engineering Department, University of Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy b Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy a Corresponding author. E-mail: [email protected] ABSTRACT The results of geometrically nonlinear analyses on 43 built-up Pultruded Fibre-Reinforced Polymer (PFRP) columns with closely spaced chords and intermittent interconnections are presented. A comparison between columns with the end section entirely loaded and columns loaded at the end battens only is reported, showing no appreciable difference in the P-δ response. The effects due to variations of column length and battens spacing are then investigated. It is found that stocky columns with small battens spacing attain pre-buckling failure at the web-flange junctions of the chords for loads approximately equal to 70% of the crushing load. Slender columns fail by global buckling, whereas intermediate-slenderness columns may experience interaction between local and global buckling. A design method is finally proposed. Keywords: PFRP; Built-up columns; Global buckling; Local buckling; Pre-buckling failure; FE analysis 1. INTRODUCTION Structural engineers are worldwide becoming increasingly aware of the potential of Pultruded Fibre- Reinforced Polymer (PFRP) profiles. However, to promote a widespread use of PFRPs in the
NUMERICAL FAILURE ANALYSIS OF BUILT-UP COLUMNS COMPOSED OF CLOSELY SPACED PULTRUDED FRP CHANNELS
Jun 14, 2023
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