Experimental Study on Lateral-Torsional Buckling of PFRP Cantilevered Channel Beams

Thumrongvut, Jaksada; Seangatith, Sittichai

doi:10.1016/j.proeng.2011.07.306

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…Civil engineering structures made of the pultruded FRP composites have been shown to provide efficient and economical applications in new structural elements, and in the rehabilitation and strengthening of imperfect members [3]. Pultruded FRP structural profiles are a brilliant choice because they have many beneficial engineering properties over the conventional building materials (structural steel and aluminium) such as high strength-to-weight ratio, low maintenance, excellent corrosion resistance, low coefficient of thermal expansion, transportation and utility facilities, and easy-to-construct structures [4][5][6][7][8][9]. The shapes of pultruded FRP profiles normally resemble those of thin-walled structural steel sections, e.g.…”

Section: Introductionmentioning

confidence: 99%

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

Thumrongvut

Pakwan

Krathumklang

2020

MSF

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In this paper, the experimental study on the pultruded fiber-reinforced polymer (pultruded FRP) angle beams subjected to transversely eccentric load are presented. A summary of critical buckling load and buckling behavior for full-scale flexure tests with various span-to-width ratios (L/b) and eccentricities are investigated, and typical failure mode are identified. Three-point flexure tests of 50 pultruded FRP angle beams are performed. The E-glass fibre/polyester resin angle specimens are tested to examine the effect of span-to-width ratio of the beams on the buckling responses and critical buckling loads. The angle specimens have the cross-sectional dimension of 76x6.4 mm with span-to-width ratios, ranging from 20 to 40. Also, four different eccentricities are investigated, ranging from 0 to ±2e. Eccentric loads are applied below the horizontal flange in increments until beam buckling occurred. Based upon the results of this study, it is found that the load and mid-span vertical deflection relationships of the angle beams are linear up to the failure. In contrast, the load and mid-span lateral deflection relationships are geometrically nonlinear. The general mode of failure is the flexural-torsional buckling. The eccentrically loaded specimens are failed at critical buckling loads lower than their concentric counterparts. Also, the quantity of eccentricity increases as buckling load decreases. In addition, it is noticed that span-to-width ratio increases, the buckling load is decreased. The eccentric location proved to have considerable influence over the buckling load of the pultruded FRP angle beams.

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Section: Introductionmentioning

confidence: 99%

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

Thumrongvut

Pakwan

Krathumklang

2020

MSF

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“…One of the most basic of FRP manufacturing processes, the pultrusion is a process that enables continuous production of composite profiles with constant cross-sections, continuous lengths and excellent dimensional tolerance of FRP profile shapes. The FRP manufactured by this process is called pultruded fiberreinforced polymer (PFRP) [4]. Existing PFRP structural profiles are usually produced in a variety of cross-sectional shapes, including wide-flanges, channels, angles, square and handrail profiles.…”

Section: Introductionmentioning

confidence: 99%

Testing and Characterization of Simply Supported Pultruded FRP Angle Beams Using Bending Tests

Thumrongvut

2018

KEM

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Structural performance and buckling behaviors of pultruded fiber-reinforced polymer (PFRP) angle profile beams under three-point bending tests are presented in this paper. The angle specimens were evaluated to investigate the effect of unbraced length of the beams on the buckling responses and critical buckling loads. In total, sixteen specimens, including eight span-to-width ratios (L/b) were tested. The dimension of the angle profile was commercially available 76x6.4 mm. The span-to-width ratios of the specimens were in the range of approximately 13 to 59. The constituent materials used for the angle profiles consist of unidirectional E-glass fibers and polyester resin. From the bending tests, the load-deformation relationships and failure modes of angle beams were reported. The experimental results indicated that the critical buckling load decreases as the span-to-width ratio increases. The degree of flexural-torsional buckling is directly related to span-to-width ratio. Furthermore, the comparison between the critical buckling loads obtained from experimental study and prediction using methods provided in AISC-LRFD design equation for PFRP angle profile beams showed an unsatisfactory correlation of the critical buckling loads.

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“…The closed-form solutions were given for simple cases by well-known sources such as Timoshenko and Gere [30] and Trahair [31]. Experimental behaviors of the flexural-torsional and lateral-torsional buckling of members are also studied by several authors [1,21,22,27]. The critical buckling load can be calculated by solving the governing integral equations or by energy principle.…”

Section: Introductionmentioning

confidence: 99%

Flexural-torsional buckling of FRP thin-walled composite with various sections

Pekbey

Ghanbari

2013

Science and Engineering of Composite Materials

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The flexural-torsional buckling of thin-walled pultruded fiber-reinforced plastic (FRP) members composed of unstiffened, stiffened cruciform-and I-shaped sections under uniform compressive loads was investigated using finite element methods (FEM). As the basic method, an eigenvalue solution using the minimum potential energy method was utilized to obtain the critical buckling stress and buckling mode shapes. FEM results were compared with the closed-form solutions and literature results. Furthermore, a parametric study was carried out to investigate the different cross-section geometries and span lengths on the critical buckling stresses and buckling mode shapes, that is, flexural, torsional, or mixed buckling.

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Experimental Study on Lateral-Torsional Buckling of PFRP Cantilevered Channel Beams

Cited by 10 publications

References 10 publications

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

Testing and Characterization of Simply Supported Pultruded FRP Angle Beams Using Bending Tests

Flexural-torsional buckling of FRP thin-walled composite with various sections

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