Local Buckling of FRP Beams and Columns

Barbero, Ever J.; Raftoyiannis, Ioannis G.

doi:10.1061/(asce)0899-1561(1993)5:3(339)

Cited by 98 publications

(31 citation statements)

References 8 publications

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“…An encompassing overview is beyond the scope of the present work and the interested reader is referred to some of the standard works in this field (see e.g., [1,7,[14][15][16][17]19]) and the references cited therein. The special situation of the local buckling of structural subelements of thin-walled composite beams has also been given some attention, see e.g., the works of Brunelle and Oyibo [5], Webber et al [20], Baharlou and Leissa [2], Barbero and Raftoyiannis [4], Bank and Yin [3], Zureick and Shih [21], Qiao et al [10], Kollár [8,9], Qiao and Zuo [11,12], or Qiao and Shan [13], among others.…”

Section: T-section I-sectionmentioning

confidence: 97%

Local buckling of wide-flange thin-walled anisotropic composite beams

Mittelstedt

2007

Arch Appl Mech

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The present contribution deals with the onset of local buckling of compressively loaded thin-walled beams with open I, C, Z, T and L-cross-sections made of laminated composite materials. The method employs a discrete plate analysis approach in the course of which each structural subelement of interest-which presently is the flange-of the thin-walled cross-section is considered as a separate composite plate with elastic rotational restraints at those edges where an adjacent substructural element is located. While in many investigations the lamination schemes of webs and flanges are considered to be purely orthotropic, in the present paper the laminate layups are allowed to be of an arbitrary non-orthotropic nature, which also allows for the analysis of laminates with inherent bending-torsion coupling. The analysis of the buckling loads of the flanges of thinwalled composite beams is performed using the Ritz-method for which some especially adjusted displacement shape functions are employed. For the case of pure orthotropy, a novel closed-form solution is described. The accuracy of the employed approaches is established by comparison with accompanying finite element simulations of thin-walled composite beams. It is revealed that the presented methodology is highly efficient in terms of computational effort and yet performs with satisfying accuracy, which makes it very attractive for actual practical applications whenever the local stability behaviour of wide-flange thin-walled composite beams is to be considered.Keywords Buckling · Composites · Laminates · Thin-walled anisotropic beams · Flanges 1 Introduction Motivation and scope of the present workIn the framework of e.g., aerospace engineering, thin-walled beams are important structural elements wherein the structural subelements which form the cross-section-i.e., the webs and flanges-in many application cases are made of laminated composite materials. Common examples for open cross-sections (meaning crosssections which exhibit free edges) are I, C, Z, T and L-profiles as depicted in Fig. 1. Naturally, one of the main factors driving the design and analysis process of such thin-walled beam structures is the stability behaviour. If the length of a beam is sufficiently high, it can be assumed that rather global buckling modes in the form of Euler buckling or torsional-flexural buckling occur. However, depending on the geometry and the applied loadings, beams with thin-walled cross-sections very often also suffer from local buckling problems such as the buckling of the flanges for which adequate means of analysis have to be found. One very common concept is the so-called discrete plate analysis. In the course of this methodology, the structural subelement of interest is cut from the cross-section. At the resultant edges, rotational restraints are considered which are characterized C. Mittelstedt (B)

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Section: T-section I-sectionmentioning

confidence: 97%

Local buckling of wide-flange thin-walled anisotropic composite beams

Mittelstedt

2007

Arch Appl Mech

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“…A number of different tests have been carried out over the past few decades. These include: shear reinforcement of wood using FRP (Triantafillou, 1997); characteristics of high strength FRP reinforcement of wood (Tingley and Cegelka, 1996); cyclic testing of pultruded beams and columns (Barbero and Raftoyiannis, 1993); and testing of rectangular composite plates for dynamic pulse buckling (Ari-Gur and Simonetta, 1997).…”

Section: Introductionmentioning

confidence: 99%

Buckling of Fibre-Reinforced Plywood Plates

Hardeo

Karunasena

2002

Structural Stability and Dynamics

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Over the last few years, there has been an increased usage of fibre-reinforced composite (FRC) materials in structural applications, including rehabilitation and retrofitting, mainly due to superior properties such as high strength, low weight and corrosion resistance of FRC materials. These superior properties of FRCs can be exploited in applications where simple light weight construction is a priority. Plywood is one of the most widely used materials in a number of light weight applications in the construction industry. This paper presents an experimental investigation of buckling behaviour of plywood plates reinforced with advanced fibre composite materials. Plywood laminated with FRC fabrics provide a superior composite which is light and has significantly improved buckling (stability) characteristics compared to its parent plywood material. The lateral deflections corresponding to increasing in-plane compressive loads on reinforced plates were closely monitored and compared with those plates with no reinforcement. 4.5mm thick plywood laminated with three different composite fibres (namely, carbon, aramid and glass) were considered in the investigation. The results of the study indicate that FRC-reinforced plywood plates exhibit a significant reduction in deflections and increase in the load carrying capacity in buckling applications.

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“…Baharlou and Leissa [13] investigated the vibration and buckling behaviour of arbitrarily laminated plates with simply supported, clamped or free edges and employed an extension of the RITZ-method with a polynomial approach for the inplane and transverse displacements. Barbero and Raftoyiannis [14] considered webs and flanges of thin-walled composite beams made of non-orthotropic laminates and employed a RITZ-formulation for the analysis of the local buckling of the individual structural elements. In the case of flange buckling, an infinite displacement expansion with sinusoidal and polynomial functions was used.…”

Section: Introductionmentioning

confidence: 99%

Stability behaviour of arbitrarily laminated composite plates with free and elastically restrained unloaded edges

Mittelstedt

2007

International Journal of Mechanical Sciences

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Local Buckling of FRP Beams and Columns

Cited by 98 publications

References 8 publications

Local buckling of wide-flange thin-walled anisotropic composite beams

Local buckling of wide-flange thin-walled anisotropic composite beams

Buckling of Fibre-Reinforced Plywood Plates

Stability behaviour of arbitrarily laminated composite plates with free and elastically restrained unloaded edges

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