Experimental response of cold-formed steel Zee-section beam-columns

Torabian, Shahabeddin; Fratamico, David C.; Schafer, Benjamin W.

doi:10.1016/j.tws.2015.10.016

Cited by 37 publications

(14 citation statements)

References 5 publications

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“…It has been observed [18,19] that the current AISI-S100-16 beam-column design approach can be overly conservative because the stability of the member under the actual stress distribution that arises due to the combined axial loading and bending is not directly considered; instead, as discussed above, a linear interaction between the purely axial and purely bending resistance end points is assumed. This effect has been investigated experimentally [20,21,22] and numerically [18,23], with a new extension to the DSM being recently proposed to account for potential strength increases if the actual stress distribution is considered [19,24,25].…”

Section: Design Of Cold-formed Steel Beammentioning

confidence: 99%

Design of prestressed cold-formed steel beams

Hadjipantelis

Gardner

2019

Thin-Walled Structures

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Structural design rules for prestressed cold-formed steel beams, considering both the prestressing and imposed vertical loading stages, are presented herein. In the proposed approach, the cold-formed steel member is designed as a beam-column using linear interaction equations in conjunction with the Direct Strength Method (DSM), while the prestressed cable is designed by ensuring that its tensile capacity is not violated during the two loading stages. In the present paper, the design approach and the failure criteria, which define the permissible design zone for the prestressed system, are first introduced. The suitability of the design recommendations is then assessed by comparing a set of parametric finite element (FE) results for several combinations of prestress levels, beam geometries and cable sizes, with the corresponding design predictions. Finally, following reliability analysis, the implementation of the design recommendations is illustrated through a practical worked example.

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Section: Design Of Cold-formed Steel Beammentioning

confidence: 99%

Design of prestressed cold-formed steel beams

Hadjipantelis

Gardner

2019

Thin-Walled Structures

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“…where the expressions for P net and M net,x are listed in Table 2 and the factored axial and bending cross-section resistances are determined using the DSM, as outlined below. This approach is similar to that followed in previous experimental and numerical works on coldformed steel beam-columns [28,35,36].…”

Section: Stage Imentioning

confidence: 78%

Prestressed cold-formed steel beams: Concept and mechanical behaviour

Hadjipantelis

Gardner

Wadee

2018

Engineering Structures

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An innovative concept, whereby the load-carrying capacity and serviceability performance of cold-formed steel beams are enhanced by utilising prestressing techniques, is presented. The prestressing force is applied by means of a high-strength steel cable, which is housed at a location eccentric to the strong geometric axis within the bottom hollow flange of the cold-formed steel beam, inducing initial stresses in the beam that are opposite in sign to those introduced during the subsequent loading stage. As a consequence, the development of local instabilities during loading is delayed and thus the capacity of the beam is enhanced. Furthermore, the pre-camber induced during prestressing, as well as the contribution of the cable to the bending stiffness of the system, decrease the overall vertical deflections of the beam. The conceptual development of prestressed cold-formed steel beams and a study investigating the potential benefits are presented. The mechanical behaviour of the proposed beams in both the prestressing and imposed loading stages is described in terms of analytical expressions, while failure criteria for the design of the cold-formed steel beam and the cable are also developed by employing interaction equations in conjunction with the Direct Strength Method. Geometrically and materially nonlinear finite element analysis with imperfections is employed to simulate the behaviour of the proposed beams. Sample numerical results are presented and compared with the developed analytical expressions and failure criteria, demonstrating the substantial enhancement in moment capacity and serviceability performance offered by these beams.

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“…The developed method was extended to axial + biaxial bending. A significant effort in the research was directed at developing appropriate methods to combine the different strength formulas into a compatible expression for any combined action; testing [45,46] as well as shell FEM simulations [47] were used to verify the developed design strength expressions [43,48]. Examples of the final result of the newly developed beam-column strength surfaces are provided in Fig.…”

Section: Design Under Multiple Actionsmentioning

confidence: 99%

00.02: Developments in research and assessment of steel structures: Highlights from the perspective of an American researcher

Schafer

2017

ce papers

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The objective of this paper is to provide a summary of recent developments in the research and assessment of steel building structures. The task is too broad to accomplish in a general sense, as such the perspective and biases of the author as an American research professor who primarily focuses on thin-walled steel building applications is explicitly recognized. The discussed research is separated into three areas: cold-formed steel structures, hot-rolled steel structures, and earthquake engineering for steel structures. The focus of the presentation is on research conducted within each of these three areas, in the last 5 years, primarily in the United States, with particular emphasis on projects that the author was directly involved in or lead. In addition, each area concludes with a brief discussion of developments in American steel codes and standards that are related to the research. Cold-formed steel structures have enjoyed a large body of recent research, advancements in: modelling, imperfection measurement, stiffness characterization, coupled instabilities, design under multiple actions, and system reliability are all highlighted. The author has had less direct involvement in much of the recent hot-rolled steel structural research, but serves on the committees where this research is brought into the American standards. Work that has had a specific impact on the American hot-rolled steel standards in beams, slender columns, composite columns, bracing, fire, and progressive collapse are all highlighted. In addition, recent research advancing modelling for fracture in steel is summarized due to the authors belief in the large long term impact of those efforts. Earthquake engineering for steel structures spans a broad space, highlighted research includes: benchmark tests and building models for cold-formed steel framing; new tests, modelling, and design guidance on structural steel seismic force-resisting systems; and new research in steel diaphragm systems. Taken as a whole, the paper aims to demonstrate the vibrancy in American steel building research, now more than 125 years since the first steel-framed skyscraper.Activity in cold-formed steel research is broad and it is impossible to provide a complete summary, recent efforts by Hancock [1] provide a more comprehensive treatment than that provided here. In this paper, a subset of key developments that the author believes have significant potential to transform the analysis or design of cold-formed steel structures is highlighted. Without a doubt, this paper leaves out significant advances that the author was either unaware of, or did not properly contemplate when preparing this summary. Computational Advances: GBT, cFSM, cFEMCold-formed steel members primarily utilize open singly-point-or un-symmetric thin-walled sections. As a result, global buckling modes are nearly always coupled (in flexure and torsion) and must include warping torsion. Due to the thin nature of the sheet used to form the sections, local plate deformations are engaged even at service ...

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Experimental response of cold-formed steel Zee-section beam-columns

Cited by 37 publications

References 5 publications

Design of prestressed cold-formed steel beams

Design of prestressed cold-formed steel beams

Prestressed cold-formed steel beams: Concept and mechanical behaviour

00.02: Developments in research and assessment of steel structures: Highlights from the perspective of an American researcher

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