The influence of structural imperfections on the LTB strength of I-beams

Rossi, Alexandre; Saito, Daniel Hideyuki; Martins, Carlos Humberto; Souza, Alex Sander Clemente de

doi:10.1016/j.istruc.2020.11.020

Cited by 25 publications

(3 citation statements)

References 39 publications

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“…However, the conventional residual stress patterns were derived based on limited test data and ordinary steel grade. Research has illustrated that the residual stress patterns would considerably influence the member buckling behaviors, and some patterns would provide non-conservative results of the ultimate capacity [57]. Moreover, with the development of modern structures, the shapes and sizes of cross sections significantly different to traditional steel members would be used where the specified residual stress patterns may be inapplicable.…”

Section: Residual Stressmentioning

confidence: 99%

Non-Linear Behavior and Design of Steel Structures: Review and Outlook

Zhang,

Chen,

Bai

et al. 2023

Buildings

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The high strength and stiffness-to-weight ratios of structural steel often result in relatively slender members and systems, which are governed to a great extent by stability limit states. However, predicting the stability of slender structures is difficult due to various inherent uncertainties in material and geometry. Generally, structural and member stabilities are nonlinear problems that cannot be directly evaluated based on the section strength using conventional analysis method. Nonlinear behaviors are basically categorized as materially and geometrically nonlinear, which can be observed at the cross-sectional, member, and frame levels. To provide a comprehensive understanding of the current state-of-the-art non-linear behavior and design of steel structures and to identify key areas for future research and development, this paper presents a review on the materially and geometrically nonlinear effects of steel structures. A discussion of the effects of material yielding accentuated by the presence of residual stresses, initial imperfections, and end conditions will be conducted. The stiffness reduction due to second-order effects and material yielding will be illustrated. Moreover, current and emerging design approaches that consider nonlinear responses will also be reviewed and evaluated. Lastly, with the development of modern flexible and complex steel structures, which sometimes violate fundamental assumptions of the current stability design method, the application of advanced analysis and design methods will be explored.

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Section: Residual Stressmentioning

confidence: 99%

Non-Linear Behavior and Design of Steel Structures: Review and Outlook

Zhang,

Chen,

Bai

et al. 2023

Buildings

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“…In the former imperfection, the steel member is not ideally straight, but has some initial geometric deformation such as the initial bending and initial distortion. The latter imperfection is caused by the residual stress due to welding and hot rolling [46]. A nonlinear post-buckling analysis should consider both the initial geometric imperfection and residual stress.…”

Section: Boundary Conditions and Initial Imperfectionsmentioning

confidence: 99%

A Parametric Study on the LDB Strength of Steel-Concrete Composite Beams

Rossi,

de Carvalho,

de Oliveira

et al. 2023

Eng

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Lateral distortional buckling (LDB) is an instability phenomenon characteristic of steel-concrete composite beams (SCCB) that occurs in the presence of hogging moments in regions close to internal supports. The LDB behavior in SCCB is not yet fully understood. The procedures for determining the LDB strength are based on the classic lateral torsional buckling theory or on the inverted U-frame model. In addition, the standard procedures make use of the classic design curves of the SSRC (Structural Stability Research Council) and ECCS (European Convention for Constructional Steelwork) developed to analyze the stability behavior of steel elements. However, studies indicate that the use of the same empirical curves obtained for the analysis of steel elements leads to the conservative results of the LDB strength in SCCB. Therefore, this article aims to assess the LDB strength in SCCB through the development of post-buckling numerical analysis using the ABAQUS software. In the parametric study, four types of steel with different mechanical properties were analyzed. In addition, the I-section, the unrestrained length, and the reinforcement rate in the concrete slab were varied. The results showed the influence of the steel type on the LDB strength and deviations from the standard procedures. A small influence of the longitudinal reinforcement area variation was verified in the LDB strength in the FE analyses; however, this factor is significantly important in the standard procedures, causing considerable divergences. These results can provide a reference for future research and specification reviews.

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“…Carlos and Al [8] performed a numerical study to understand the influence of certain imperfections on the lateral buckling of slender I-beams. The work of Rossi and Al [9] have detailed the influence of imperfections on the resistance of I-beams on lateral buckling.The combination of numerical and experimental methods has enabled certain authors [10][11][12][13][14][15] to understand the failure mode of I-beams under lateral buckling.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical study of influence of the shape of the section on lateral buckling of doubly symmetrical sections

Egereva

Bonga

2021

E3S Web Conf.

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This paper presents an analytical and numerical study of the lateral buckling of beams with double symmetrical I and H cross sections having substantially the same plastic modulus of resistance around the strong axis subjected by a uniformly distributed load in order to understand the influence of the one of the forms during lateral buckling. For this, a critical elastic moment analysis is carried out using ANSYS software using the element SHELL181 and analytical formulas from Eurocode3. Finally, there is a presentation of the non-linear behavior of these two cross sections.

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The influence of structural imperfections on the LTB strength of I-beams

Cited by 25 publications

References 39 publications

Non-Linear Behavior and Design of Steel Structures: Review and Outlook

Non-Linear Behavior and Design of Steel Structures: Review and Outlook

A Parametric Study on the LDB Strength of Steel-Concrete Composite Beams

Analytical and numerical study of influence of the shape of the section on lateral buckling of doubly symmetrical sections

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