Simulation and design of semi-compact elliptical hollow sections

Meng, Xin; Gardner, Leroy

doi:10.1016/j.engstruct.2019.109807

Cited by 28 publications

(33 citation statements)

References 45 publications

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“…The key features of the finite element (FE) models are described herein. Shell models, using the element type S4R [4], with a mesh size equal to 0.1 e D t (where D e is the equivalent diameter corresponding to the radius of curvature at the point where local buckling initiates for EHS and is equal to the outer diameter D for CHS and t is the thickness) were established; the adopted mesh was shown to be fine enough to capture the local buckling behaviour but still maintain a good level of computational efficiency [5]. Symmetry simplification was employed, as illustrated in Fig.…”

Section: Description Of Numerical Modelsmentioning

confidence: 99%

“…(1),which was developed by [5] based on the existing local imperfection measurement data, was utilised to calculate the local imperfection amplitudes ω l . In terms of the residual stresses, the residual stresses in hot-rolled CHS and EHS are typically small in magnitude, while for cold-formed CHS and EHS, the influence of the more dominant bending residual stresses are inherently captured in the stress-strain relationships obtained from tensile testing [5], [6]. Therefore, explicit incorporation of residual stresses was deemed unnecessary for both hot-rolled and cold-formed CHS and EHS.…”

Section: Design and Researchmentioning

confidence: 99%

“…The developed FE models were previously validated by the authors against 84 test data on CHS and 65 test data on EHS under all considered loading scenarios, as reported in [5], [6], and were shown to be suitable for the were utilised to investigate the biaxial bending scenarios. All degrees of freedoms at the end sections were coupled to a reference point, where suitable boundary conditions were applied.…”

Section: Validationmentioning

confidence: 99%

“…Note that the design of CHS with l L > 0.6, which are categorised as shells, is treated in EN 1993-1-6 [17] is therefore beyond the scope of the present study. Based on the test data collected by [5], [6] and the FE results generated from the parametric studies ( Fig. 8), the slenderness limits of l 0 = 0.36 (corresponding to D e /tε 2 = 140) for 10), where B 1 is the coefficient describing the shape of the base curve, while the ultimate strain ε u and the material coefficient C 1 are the parameters used in the material models, as described later in this section.…”

Section: Design Alternative 1 -Strength-based Approachmentioning

confidence: 99%

“…Symmetry simplification of FE models[5] Comparisons of load-deformation curves from FE models and tests reported in[7]-[9] for stub columns (left) and beams under four-point bending (right)…”

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The generalised slenderness‐based resistance method for the design of CHS and EHS

et al. 2019

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Selected, extended paper from the SDSS 2019 special session ECCS/TC8 – Structural Stability This paper presents the development and assessment of an innovative cross‐section design method for structural steel circular and elliptical hollow sections (CHS and EHS) – the generalised slenderness‐based resistance method (GSRM). A numerical simulation programme was first conducted to expand the data pool for CHS and EHS. Finite element (FE) models were established, validated against existing test data and then utilised for parametric studies, where a total of over 3 700 cross‐section resistance data were numerically generated. The development of the GSRM for CHS and EHS is then presented. Key design parameters, including the reference resistances and the generalised local slenderness, are initially defined. The general design procedure is subsequently introduced. Two design alternatives for CHS and EHS – a strength‐based approach, and a deformation‐based approach based on the continuous strength method (CSM), are developed and presented. Finally, the proposed GSRM is assessed using the previously collected test results and freshly generated FE data, where excellent accuracy and consistency in the resistance predictions are clearly revealed for all loading scenarios. Subsequent reliability analyses demonstrate that the current partial safety factor used in EN 1993‐1‐1 can be applied to the GSRM, achieving an appropriate level of reliability.

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Section: Description Of Numerical Modelsmentioning

confidence: 99%

Section: Design and Researchmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

Section: Design Alternative 1 -Strength-based Approachmentioning

confidence: 99%

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The generalised slenderness‐based resistance method for the design of CHS and EHS

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Reliability assessment for the Generalized Slenderness based Resistance Method for circular and elliptical hollow sections

Beyer¹,

Gardner

Meng

et al. 2021

ce papers

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In the framework of the RFCS project HOLLOSSTAB, a new design method for determining the resistance of hollow section members has been developed. This method links a generalized slenderness, calculated under the effect of the combined loading, to the resistance of the cross‐section and of the member. This so‐called “Generalized Slenderness‐based Resistance Method” (GSRM) has been shown to provide accurate predictions of experimentally and numerically determined resistances of hollow sections. Nonetheless, the real benefit of this new design method could only be evaluated after a conscientiously performed reliability analysis that is presented in this paper. First, the statistical data of the input variables (cross‐section dimensions, material law) obtained through measurements are presented and compared to the assumptions of Annex E of EN 1993‐1‐1:2020. Then, the reliability analysis is outlined. In particular, attention is given to specific problems resulting from the fact that several basic parameters of GSRM have to be determined numerically (for example the critical loads under combined loading). In addition, the sensitivity of the resulting partial factors to assumptions concerning the statistical distribution of the input variables is studied and discussed.

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Revision of EN 1993‐1‐1 – Design Rules for Member Buckling

Bureau¹,

Snijder²,

Knobloch³

et al. 2022

ce papers

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For better applicability, the new section 7 'Structural analysis' in the formal vote draft FprEN 1993-1-1 [1] has been restructured compared with the current section 5 in EN 1993-1-1 [2] on structural analysis, while largely retaining the same content. This new section links the calculation of internal forces with the verification for the ultimate limit state. Essentially, it is about the conditions under which determination of internal forces considering second order effects with the assumption of imperfections is required and whether a stability member check may be performed. Similar guidance is currently given in EN 1993-1-1 cl. 5.2.2.

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Simulation and design of semi-compact elliptical hollow sections

Cited by 28 publications

References 45 publications

The generalised slenderness‐based resistance method for the design of CHS and EHS

The generalised slenderness‐based resistance method for the design of CHS and EHS

Reliability assessment for the Generalized Slenderness based Resistance Method for circular and elliptical hollow sections

Revision of EN 1993‐1‐1 – Design Rules for Member Buckling

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