Lateral and distortional buckling of pultruded I-beams

Barbero, Ever J.; Raftoyiannis, Ioannis G.

doi:10.1016/0263-8223(94)90087-6

Cited by 37 publications

(14 citation statements)

References 6 publications

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“…The flexural-torsional buckling behavior of pultruded E-glass composite I-beams was investigated experimentally by Mottram [5], and it concluded that there was a potential danger in analysis and design of FRP beams without considering the shear deformation. Based on the energy consideration and variational principle, the lateral and distortional buckling of pultruded I-beams was studied by Barbero and Raftoyiannis [6]. A series of lateral buckling tests on small-scale pultruded E-glass FRP beams was carried out by Brooks and Turvey [7] and Turvey [8]; the effects of load position on the lateral buckling response of FRP I-sections were investigated.…”

Section: Introductionmentioning

confidence: 99%

Flexural–torsional buckling of fiber-reinforced plastic composite open channel beams

Shan

Qiao

2005

Composite Structures

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Section: Introductionmentioning

confidence: 99%

Flexural–torsional buckling of fiber-reinforced plastic composite open channel beams

Shan

Qiao

2005

Composite Structures

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“…When loaded, the I-sections are subjected to combined axial (or normal) and shear stress fields. It is well-known that the web panel does most of work in resisting the shear force [1,2]. The shear force often causes a critical condition of failure of a loaded I-section.…”

Section: Introductionmentioning

confidence: 99%

“…Since the early 1990s, many researchers have studied the buckling of fiber reinforced polymer (FRP) composite members: Barbero and Raftoyiannis reported analytical and experimental approaches to buckling of pultruded FRP columns [1,2]. Motram [3] published his study on pultruded composites’ lateral-torsional buckling for the first time.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Shear Buckling Load of a Large Polymer Composite I-Section Using Strain and Displacement Sensors

Park

Lee

2012

Sensors

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This paper presents a method and procedure of sensing and determining critical shear buckling load and corresponding deformations of a comparably large composite I-section using strain rosettes and displacement sensors. The tested specimen was a pultruded composite beam made of vinyl ester resin, E-glass and carbon fibers. Various coupon tests were performed before the shear buckling test to obtain fundamental material properties of the I-section. In order to sensitively detect shear buckling of the tested I-section, twenty strain rosettes and eight displacement sensors were applied and attached on the web and flange surfaces. An asymmetric four-point bending loading scheme was utilized for the test. The loading scheme resulted a high shear and almost zero moment condition at the center of the web panel. The web shear buckling load was determined after analyzing the obtained test data from strain rosettes and displacement sensors. Finite element analysis was also performed to verify the experimental results and to support the discussed experimental approach.

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“…A second early study of lateral-torsional buckling of pultruded I-sections worth noting was performed by Barbero and Raftoyiannis (1994). This study investigated the effects of crosssectional geometry on the overall failure mode of these types of specimens, including local buckling, lateral-torsional buckling, as well as a combined type of failure known as distortional buckling.…”

Section: Ltb Of Gfrp Open Sectionsmentioning

confidence: 99%

“…This study investigated the effects of crosssectional geometry on the overall failure mode of these types of specimens, including local buckling, lateral-torsional buckling, as well as a combined type of failure known as distortional buckling. Due to low stiffness in the transverse direction, pultruded open sections of certain dimensions are susceptible to this type of coupled failure which can result in a drastic reduction in the overall buckling capacity of the member (Barbero and Raftoyiannis 1994). At the time of this study, very little research existed related to distortional buckling failures, especially for FRP composites.…”

Section: Ltb Of Gfrp Open Sectionsmentioning

confidence: 99%

Bending and Shear Behavior of Pultruded Glass Fiber Reinforced Polymer Composite Beams With Closed and Open Sections

Estep¹

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Several advantages, such as high strength-to-weight ratio, high stiffness, superior corrosion resistance, and high fatigue and impact resistance, among others, make FRPs an attractive alternative to conventional construction materials for use in developing new structures as well as rehabilitating in-service infrastructure. As the number of infrastructure applications using FRPs grows, the need for the development of a uniform Load and Resistance Factor Design (LRFD) approach, including design procedures and examples, has become paramount. Step-by-step design procedures and easy-to-use design formulas are necessary to assure the quality and safety of FRP structural systems by reducing the possibility of design and construction errors. Since 2008, the American Society of Civil Engineers (ASCE), in coordination with the American Composites Manufacturers Association (ACMA), has overseen the development of the Pre-Standard for Load and Resistance Factor Design (LRFD) of Pultruded Fiber Reinforced Polymer (FRP) Structures using probability-based limit states design. The fifth chapter of the pre-standard focuses on the design of members in flexure and shear under different failure modes, where the current failure load prediction models proposed within have been shown to be highly inaccurate based on experimental data and evaluation performed by researchers at the West Virginia University Constructed Facilities Center. A new prediction model for determining the critical flexural load capacity of pultruded GFRP square and rectangular box beams is presented within. This model shows that the type of failure can be related to threshold values of the beam span-to-depth ratio (L/h) and total flange width-to-thickness ratio (b f /t), resulting in three governing modes of failure: local buckling failure in the compression flange (4 ≤ L/h < 6), combined strain failure at the web-flange junction (6 ≤ L/h ≤ 10), and bending failure in the tension flange (10 < L/h ≤ 42). Broadly, the proposed equations are predicting critical flexural load capacities within ±22.3% of experimental data for all cases, with over 70% of all experimental data with within ±10% error. A second prediction model was developed for predicting the critical lateral-torsional buckling (LTB) load for pultruded GFRP open sections, including wide flange (WF) sections and channels. Multiple LTB equations from several sources were considered and applied but yielded inaccurate results, leading to the development of this new critical buckling load prediction model based on the well-established elastic LTB strength equation for steel. By making a series of modifications to equations for calculating the weak axis moment of inertia, torsional warping constant, and torsion constant for open sections, as well as recognizing the influence of the shear lag phenomenon, the critical LTB load is predicted within ±15.2% of experimental data for all channel and WF specimens tested and evaluated in the study. pursue a Master of Science degree, for his guidance throughout the complet...

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Lateral and distortional buckling of pultruded I-beams

Cited by 37 publications

References 6 publications

Flexural–torsional buckling of fiber-reinforced plastic composite open channel beams

Flexural–torsional buckling of fiber-reinforced plastic composite open channel beams

Determination of the Shear Buckling Load of a Large Polymer Composite I-Section Using Strain and Displacement Sensors

Bending and Shear Behavior of Pultruded Glass Fiber Reinforced Polymer Composite Beams With Closed and Open Sections

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