Buckling length analysis for compression chord in cold-formed steel cantilever truss

Konkong, Nirut; Aramraks, Trakool; Phuvoravan, Kitjapat

doi:10.1007/s13296-017-6031-7

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Taking into account the previously expressed variables , , , k λ γ δ and the expressions ( 16), (17), and (56), the resulting system of homogeneous equations is as follows:…”

Section: Casementioning

confidence: 99%

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Theoretical Study Regarding the General Stability of Upper Chords of Truss Bridges as Beams on Continuous or Discrete Elastic Supports

Răcănel

2024

Infrastructures

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New or in-service truss bridges, with or without upper bracing systems, may display instability phenomena such as general lateral torsional buckling of the upper chord. The buckling of structural elements, particularly in the case of steel bridges, can be associated with the risk of collapse or temporary/permanent withdrawal from service. Such incidents have occurred in the case of several bridges in different countries: the collapse of the Dee bridge with truss girders in 1847 in Cheshire, England; the collapse of the semi-parabolic truss girder bridge near Ljubičevo over the Morava River in Serbia in 1892; the collapse of the Dysart bridge in Cambria County, Pennsylvania in 2007; the collapse of the Chauras bridge in Uttarakhand, India in 2012; and the collapse of a bridge in Nova Scotia, Canada (2020), and such examples may continue. Buckling poses a significant danger as it often occurs at lower load values compared to those considered during the design phase. Additionally, this phenomenon can manifest suddenly, without prior warning, rendering intervention for its prevention impossible or futile. In contemporary times, most research and design calculation software offer the capability to establish preliminary values for buckling loads, even for highly intricate structures. This is typically achieved through linear eigenvalue buckling analyses, often followed by significantly more complex large displacement nonlinear analyses. However, interpreting the results for complex bridge structures can be challenging, and their accuracy is difficult to ascertain. Consequently, this paper aims to introduce an original method for a more straightforward estimation of the buckling load of the upper chord in steel truss bridges. This method utilizes the theory of beams on discrete elastic supports. The buckling load of the upper chord was determined using both the finite element method and the proposed methodology, yielding highly consistent results.

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“…Taking into account the previously expressed variables , , , k λ γ δ and the expressions ( 16), (17), and (56), the resulting system of homogeneous equations is as follows:…”

Section: Casementioning

confidence: 99%

“…Studies presented in Refs. [16,17] address the values of buckling lengths recommended for the practical stability analyses of compressed chords in truss bridges. These values are discussed in comparison with those stipulated in current standards.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study Regarding the General Stability of Upper Chords of Truss Bridges as Beams on Continuous or Discrete Elastic Supports

Răcănel

2024

Infrastructures

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“…These values are discussed in comparison with those stipulated in current standards. Additionally, authors in [9], [11], and [14] propose alternative methods for considering the distribution of axial force along the compressed chord, comparing them to the commonly used parabolic distribution. In [11], the critical loading value was obtained by considering the element continuously supported on an elastic Winkler or Pasternak foundation, taking into account only axial forces, only transverse forces and combinations of axial and transverse forces.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study regarding the General Stability of Upper Chords of Truss Bridges as Beams on Elastic Foundation

Răcănel

2023

Preprint

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New or in-service truss bridges, with or without upper bracing systems, may display instability phenomena such as general lateral torsional buckling of the upper chord. The buckling of structural elements, particularly in the case of steel bridges, can be associated with the risk of collapse or temporary/permanent withdrawal from service. Buckling poses a significant danger as it often occurs at lower load values compared to those considered during the design phase. Additionally, this phenomenon can manifest suddenly, without prior warning, rendering intervention for its prevention impossible or futile. In contemporary times, most research and design calculation software offer the capability to establish preliminary values for buckling loads, even for highly intricate structures. This is typically achieved through linear eigenvalue buckling analyses, often followed by significantly more complex large displacement nonlinear analyses. However, interpreting the results for complex bridge structures can be challenging, and their accuracy is difficult to ascertain. Consequently, the objective of this paper is to introduce an original method for a more straightforward estimation of the buckling load of the upper chord in steel truss bridges. The method utilizes the theory of beams on an elastic foundation. The buckling load of the upper chord was determined using both the finite element method and the proposed methodology, yielding highly consistent results.

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“…Cold-formed steel (CFS) has been used in many parts of building structures because it can be variously shaped and can be used in a variety of applications and can be employed in structural and non-structural building systems. For example, channel sections are often used in the construction of steel framing systems such as columns, beams, and truss structures [1][2][3]. Due to some unique advantages such as high strength-to-weight ratio and construction speed, cold-formed steel components have seen substantial expansion in use in the building sector in recent years.…”

Section: Introductionmentioning

confidence: 99%

Prediction of In-plane Stiffness for the Cold-formed Steel Frame of the Wall Panel Structure

Benchaphong

Hongthong

Konkong

et al. 2022

Period. Polytech. Civil Eng.

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The purpose of this research was to study the lateral deformation behavior of cold-formed steel wall panel structures using experimental tests, finite element analysis and analytical methods to study the lateral stiffness of these structures. The wall panel structures were tested by full-scale experiments the experimental results of which were verified by a 3D-finite element model. The verification results showed a good correlation between the experimental tests and a finite element model. The single-column spring model was proposed for an elastic lateral stiffness analysis of the cold-formed steel wall panel structures that were formed by combinations of a guide cantilever beam and springs connection. The spring constants were defined by using the stiffness of the stub-chord connection and the bending stiffness of the chord. The experiments tests and finite element analysis were used to verify this single-column spring model. The comparison results showed good agreement between the analytical prediction, finite element analysis and experimental data in the case of the primary type of cold-formed wall structure. The proposed procedure was an efficient method for elastic lateral deformation analysis of cold-formed wall panel structures which can be used for such configurations.

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Buckling length analysis for compression chord in cold-formed steel cantilever truss

Cited by 8 publications

References 13 publications

Theoretical Study Regarding the General Stability of Upper Chords of Truss Bridges as Beams on Continuous or Discrete Elastic Supports

Theoretical Study Regarding the General Stability of Upper Chords of Truss Bridges as Beams on Continuous or Discrete Elastic Supports

Theoretical Study regarding the General Stability of Upper Chords of Truss Bridges as Beams on Elastic Foundation

Prediction of In-plane Stiffness for the Cold-formed Steel Frame of the Wall Panel Structure

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