ECCM15 - 15 TH EUROPEAN CONFERENCE ON COMPOSITE MATERIALS, Venice, Italy, 24-28 June 2012 1 FINITE ELEMENT BUCKLING AND POSTBUCKLING ANALYSIS OF PULTRUDED FRP I-SECTION COLUMNS F. Laudiero 1 , F. Minghini 1* , N. Tullini 1 1 Engineering Department, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy *[email protected] Keywords: PFRP; I-section; buckling-mode interaction; postbuckling analysis. Abstract The present work puts in evidence some interesting features of Pultruded Fibre-Reinforced Plastic (PFRP) I-section columns. A finite-element model of a commercial I-section shape with dimensions 305×152×12.7 mm was implemented using four-node orthotropic plate elements. Ten column lengths were investigated, covering the range from stocky up to very slender columns. A nonlinear analysis of buckling and postbuckling was carried out using the displacement control method. It was observed that, in the case of stocky columns, the ultimate conditions are governed by the web failure, whereas, in the case of slender columns, the high longitudinal compressive stresses attained lead to the flange failure. With respect to a wide- flange shape by the same pultruder and with equal cross-section area, the I-section column shows a higher ultimate resistance in a broad range of column lengths. 1 Introduction In PFRP short columns with wide-flange (WF) section subjected to axial compression, the instability is triggered by the flange buckling (see [1]) and the ultimate conditions are governed by the strength of the web-flange junctions, [2]. In slender WF columns, the interaction between global and local buckling modes may occur (see [3]) and the ultimate resistance is strongly influenced by the amplitude of the initial imperfection, [4]. With regard to PFRP narrow-flange (I-section) profiles, less information is available, since WF columns are generally preferred for construction. However, I-section columns are characterized by some interesting features, which the present work tries to explain. A finite-element model of a commercial I-section shape with dimensions 305×152×12.7 mm was implemented using four- node orthotropic plate elements. Ten column lengths were investigated, covering the range from stocky up to very slender columns. A geometric nonlinear analysis was carried out by imposing an incremental column shortening to the end section centroids. The failure mechanisms of the column are discussed in the paper, and a comparison with a WF shape of the same pultruder and with similar cross-section area is presented. 2 Analytical buckling loads The equations presented in the following apply to WF- or I-section columns with length L, cross-section height H, flange width b f and, finally, web and flange thicknesses t w and t f , respectively (Figure 1a).
FINITE ELEMENT BUCKLING AND POSTBUCKLING ANALYSIS OF PULTRUDED FRP I-SECTION COLUMNS
Jun 14, 2023
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