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Teoman Peköz - One of the best experts on this subject based on the ideXlab platform.

  • Distortional Buckling test for steel storage rack columns
    Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2013
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, J. Bonada, Teoman Peköz
    Abstract:

    An investigation into the test method for Distortional Buckling of steel storage rack columns is presented. The main problem of the experimental method is to determine the length of the samples to ...

  • An experimental investigation of Distortional Buckling of steel storage rack columns
    Thin-Walled Structures, 2011
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, Teoman Peköz
    Abstract:

    An experimental investigation on the behavior of steel storage rack columns subjected to compression is presented. Members of different lengths are tested, but special attention is focused on the behavior of the specimens having lengths that make them subject to Distortional Buckling. This mode of Buckling can be observed in moderately long specimens; namely, longer than the stub columns used for the determination of the local Buckling strength, but short enough to avoid the effects of global Buckling. The deformation experienced by these specimens is measured, and it is observed that there is a range of member lengths where the failure mode is a combination of Distortional Buckling and global Buckling modes. Furthermore, it is verified that, although the effect of the interaction between these modes on the member strength is not large, the accuracy of the current design procedures improves if it is considered in the calculations.

  • INVESTIGATION OF THE TEST METHOD FOR Distortional Buckling OF COMPRESSED PALLET RACK MEMBERS
    2010
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, Teoman Peköz
    Abstract:

    An investigation of the test methods for Distortional Buckling of perforated pallet rack members subjected to compression is presented. One of the key points of this test is the length of the specimen. According to the AISI Test Standard S910-08, the specimen length should be sufficiently short to minimize overall column effects, and sufficiently long to minimize end effects during loading. The aim of the investigation is to set a procedure for determining the specimen length according to this condition. Four different pallet rack sections are analysed and tested. Testing lengths are chosen from results of finite element linear Buckling analyses and Direct Strength Method calculations. Distortional Buckling was expected to be the dominant failure mode for some of the specimens tested. However, in the end, all experimental failures showed a significant participation of global Buckling modes. The paper presents a discussion on the specimen behaviour observed in the tests, and some considerations concerning the effect of end support conditions on the experimental results.

  • Distortional Buckling of thin walled beams panels i theory
    Journal of Structural Engineering-asce, 1995
    Co-Authors: Reynaud Serrette, Teoman Peköz
    Abstract:

    The introduction of the standing seam panel for roof systems provided the building industry with an efficient solution to watertightness problems. These panels have two major advantages over the conventional trapezoidal through-fastened panel: an elevated seam and concealed “hold-down” clips. The relatively small depth-to-width ratio of the panel guarantees that overall the panel is laterally stable under gravity load. The capacity of laterally stable standing-seam panels may, however, be reduced due to lateral instability of the unsupported compression flange. This mode of instability has been referred to in the literature as Distortional Buckling—a form of instability for unsupported lengths between those for local and lateral Buckling. In the present paper, an analytical expression, based on a beam on elastic foundation model, is presented for estimating the elastic Distortional Buckling stress in sections with laterally unsupported compression flanges. The beam is assumed to comprise the outstanding leg, and the elastic foundation is provided by the rotational restraint of the tension flange and the web. A comparison of the analytical results with the results from elastic finite-strip Buckling analyses shows good agreement between the two methods of analysis.

Wei-bin Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Distortional Buckling of perforated cold formed steel beams subject to uniformly distributed transverse loads
    Thin-walled Structures, 2020
    Co-Authors: Boksun Kim, Weijian Hong, Wei-bin Yuan
    Abstract:

    Abstract Thin-walled channel beams are easily punched with circular holes on the web to allow the access for services such as plumbing pipes and electric wires. The presence of the holes can alter the stress distribution in the member and reduce the cross-sectional property. Consequently, it changes its Buckling mode. Since perforated cold-formed steel beams are usually placed between main structural frame and corrugated roof, the most common loading case is the uniformly distributed transverse load. Recent work by Chen and Li has given the solution for Distortional Buckling of channel-, zed- and sigma-sections subject to the uniformly distributed transverse load. This paper is an extension of Chen and Li's research to explore the Distortional Buckling behaviour of perforated cold-formed steel beams with holes. The effect of perforations on the critical stress is evaluated. A new model is deduced to predict the critical stress of Distortional Buckling by reducing the stiffness of the vertical spring. The Rayleigh-Ritz method is used to solve eigenvalue problems. In order to validate the analytical model, finite element analyses have been performed by using ANSYS. When the beam is longer than 3500 mm, the critical stress computed from the analytical model matches well with the critical stress acquired from the finite element analyses.

  • An analytical solution of Distortional Buckling resistance of cold-formed steel channel-section beams with web openings
    Thin-walled Structures, 2019
    Co-Authors: Nan-ting Yu, Wei-bin Yuan, Long-yuan Li, Feng Yu
    Abstract:

    Abstract Circular holes can be commonly found in the web of cold-formed steel beams to accommodate services such as electric wires and pipelines. The presence of holes will reduce the critical Buckling stress of the beams. Hancock proposed solution for determining the Distortional critical stress of channel section beams, but limited to the sections without holes. This paper presents an analytical study on the Distortional Buckling of cold-formed steel channel-section beams with circular holes in the web. Hancock's solution has been modified to derive a simple formulation for approximating the elastic critical stress and moment of Distortional Buckling of the channel-section beams with circular holes in the web, which are compared with those from the finite element Buckling analysis using ANSYS. Finally, the influence of multiple holes on the Distortional Buckling behaviour and corresponding elastic Buckling stress of beams in bending is discussed.

  • Distortional Buckling of perforated cold-formed steel channel-section beams with circular holes in web
    International Journal of Mechanical Sciences, 2017
    Co-Authors: Wei-bin Yuan, Nan-ting Yu, Long-yuan Li
    Abstract:

    Abstract This paper presents the numerical and analytical investigations on the Distortional Buckling of perforated cold-formed steel channel-section beams with circular holes in web. The numerical investigation involves the use of finite element methods. In the analytical analysis the Distortional Buckling model recommended in EN1993-1-3 is employed. The influence of the web holes on the Distortional Buckling behaviour and corresponding critical stress and moment of perforated cold-formed steel channel-section beams are discussed. Finally, a simple analytical formulation is proposed for evaluating the effect of hole size on the reduction of critical stress and critical moment of the channel-section beams with circular holes in web.

  • Web-flange Distortional Buckling of partially restrained cold-formed steel purlins under uplift loading
    International Journal of Mechanical Sciences, 2014
    Co-Authors: Wei-bin Yuan, Shanshan Cheng, Boksun Kim
    Abstract:

    Abstract It is well-known that cold-formed steel (CFS) members of open section can buckle locally, Distortionally and/or lateral-torsionally. Since they are usually used as the secondary structural members in buildings to support roof and side cladding or sheeting, CFS beams are mostly treated as the restrained beams either fully or partially in its lateral and/or rotational directions. For a thin-walled channel- or zed-section beam subjected to uplift loading, if its upper flange is fully restrained in its lateral and rotational directions, the beam will not buckle lateral-torsionally, but may have a web-flange Distortional Buckling. In the literature there is limited information on the web-flange Distortional Buckling and currently the critical stress for the web-flange Distortional Buckling is calculated mainly by using numerical methods. In this paper an analytical model is presented to describe the web-flange Distortional Buckling behavior of the partially restrained CFS beams when subjected to uplift loading. Formula used to calculate the critical stress of web-flange Distortional Buckling is derived. Comparisons of the predicted critical stresses with those obtained using finite strip and finite element methods are provided to demonstrate the appropriateness of the model proposed.

Long-yuan Li - One of the best experts on this subject based on the ideXlab platform.

Miquel Casafont - One of the best experts on this subject based on the ideXlab platform.

  • Distortional Buckling test for steel storage rack columns
    Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2013
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, J. Bonada, Teoman Peköz
    Abstract:

    An investigation into the test method for Distortional Buckling of steel storage rack columns is presented. The main problem of the experimental method is to determine the length of the samples to ...

  • An experimental investigation of Distortional Buckling of steel storage rack columns
    Thin-Walled Structures, 2011
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, Teoman Peköz
    Abstract:

    An experimental investigation on the behavior of steel storage rack columns subjected to compression is presented. Members of different lengths are tested, but special attention is focused on the behavior of the specimens having lengths that make them subject to Distortional Buckling. This mode of Buckling can be observed in moderately long specimens; namely, longer than the stub columns used for the determination of the local Buckling strength, but short enough to avoid the effects of global Buckling. The deformation experienced by these specimens is measured, and it is observed that there is a range of member lengths where the failure mode is a combination of Distortional Buckling and global Buckling modes. Furthermore, it is verified that, although the effect of the interaction between these modes on the member strength is not large, the accuracy of the current design procedures improves if it is considered in the calculations.

  • INVESTIGATION OF THE TEST METHOD FOR Distortional Buckling OF COMPRESSED PALLET RACK MEMBERS
    2010
    Co-Authors: Miquel Casafont, Francesc Roure, M.m. Pastor, Teoman Peköz
    Abstract:

    An investigation of the test methods for Distortional Buckling of perforated pallet rack members subjected to compression is presented. One of the key points of this test is the length of the specimen. According to the AISI Test Standard S910-08, the specimen length should be sufficiently short to minimize overall column effects, and sufficiently long to minimize end effects during loading. The aim of the investigation is to set a procedure for determining the specimen length according to this condition. Four different pallet rack sections are analysed and tested. Testing lengths are chosen from results of finite element linear Buckling analyses and Direct Strength Method calculations. Distortional Buckling was expected to be the dominant failure mode for some of the specimens tested. However, in the end, all experimental failures showed a significant participation of global Buckling modes. The paper presents a discussion on the specimen behaviour observed in the tests, and some considerations concerning the effect of end support conditions on the experimental results.

Roger Kettle - One of the best experts on this subject based on the ideXlab platform.