New design rules for lipped channel beams subject to web crippling under two-flange load cases

Sundararajah, Lavan; Mahendran, Mahen; Poologanathan, Keerthan

doi:10.1016/j.tws.2017.06.003

Cited by 76 publications

(90 citation statements)

References 6 publications

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“…Simply supported boundary conditions (pinned crippling load case are present, this study focuses on the interior two flanges (ITF) load case only. In order to develop the FE models for the ITF load case, the extensive detailed work presented in [40] was followed and the brief details used to construct the models are described in this section.…”

Section: Articlementioning

confidence: 99%

“…All the aforementioned model characteristics for bending, shear and web-crippling actions were validated with the supports) were assigned to the reference point of the loading and bearing plates, while only the loading plate was allowed to translate vertically downwards using the displacement-control approach. The effect of the geometric imperfections was not considered in the model due to its negligible influence (less than 1 %) in the web-crippling capacity as reported in [40]. Moreover, the surface-to-surface contact option in ABAQUS was assigned between the bearing and loading plates and the primary model, and the friction coefficient between these two was set to 0.4.…”

Section: Validation Of Fe Modelsmentioning

confidence: 99%

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Structural behaviour of optimized cold‐formed steel beams

et al. 2020

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Cold-formed steel (CFS) members have been used significantly in light-gauge steel buildings due to their inherent advantages. Optimizing these CFS members in order to gain enhanced loadbearing capacities will result in economical and efficient building solutions. This research presents the investigation and results of the optimization of CFS members for flexural capacity. The optimization procedure was performed using the particle swarm optimization (PSO) method, while the section moment capacity was determined based on the effective width method adopted in EN 1993-1-3 (EC3). Theoretical and manufacturing constraints were incorporated while optimizing the CFS crosssections. In total, four CFS sections-lipped channel beam (LCB), optimized LCB, folded-flange and super-sigma-were considered in the optimization process, including new sections. The section moment capacities of these sections were also obtained through non-linear finite element (FE) analysis and compared with the EC3-based, optimized section moment capacities. The results show that, compared with a commercially available LCB with the same amount of material, the new CFS sections possess the highest section moment capacity enhancements (up to 65 %). In addition, the performance of these CFS sections when subjected to shear and web-crippling actions was also investigated using non-linear FE analysis.

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Section: Articlementioning

confidence: 99%

Section: Validation Of Fe Modelsmentioning

confidence: 99%

Structural behaviour of optimized cold‐formed steel beams

et al. 2020

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“…The imperfection shape was introduced using *IMPERFECTION option in ABAQUS. Prior to that, validation of the FE models was performed with experiment results of LCBs available in (15), (16), (17) for bending, shear and web crippling, respectively. It showed a good agreement with experiment results with mean(Test/FEA)=0.97 and COV=0.07, mean(Test/FEA)=0.93 and COV=0.04 and mean(Test/FEA)=0.99 and COV=0.02 for aforementioned behaviours, respectively.…”

Section: Numerical Analysismentioning

confidence: 99%

Optimum Design of Cold‐formed Steel Beams: Particle Swarm Optimisation and Numerical Analysis

Gatheeshgar

Poologanathan

Gunalan³

et al. 2019

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Cold-formed steel (CFS) members, when subjected to optimisation, can significantly increase their ultimate load carrying capacity leading to a more economical and efficient structural system. This paper presents the details of an investigation on optimisation of CFS beams subjected to bending capacity and an investigation of shear and web crippling capacities of optimised sections. The optimisation was aimed to meet construction constraints reported in Eurocode 3 (EC3). In this research, 4 different CFS sections were considered including the introduction of 2 novel sections (Super Sigma and Smart Beam) which has closer shear center to the web and less susceptible to web buckling. The bending capacity of the available sections were obtained based on the effective width method reported in EC3, while the optimisation procedure was performed using particle swarm optimisation (PSO). The capacities of the optimised CFS beams were also obtained using the nonlinear finite element (FE) analysis and the FE results were compared with EC3. The FE results showed that the Smart beam and Super Sigma claim dual advantage of increase in section moment capacity and restrain against torsional effect than the conventional CFS channel sections with the same amount of material. These optimised cold formed steel beams can be employed in light gauge steel building constructions.

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“…However, past research is primarily based on experimental studies of open cold-formed steel sections (C-, Z-, hat-shaped and built-up sections). Limited research has been conducted on the web crippling behaviour of channel beams, lipped channel beams and hollow flange channel beams under EOF and IOF load cases (Keerthan and Mahendran [17]; and Gunalan and Mahendran [18]) when compared with End Two Flange (ETF) and Interior Two Flange (ITF) load cases (Young and Hancock [19]; Macdonald et al [13]; Uzzaman et al [20]; Keerthan et al [21]; Sundararajah et al [22,23]; and Steau et al [16]). Only few researchers have considered channel beams with flanges fastened to supports (Young and Hancock [19]; and Janarthanan et al [24]).…”

Section: Web Crippling Of Cold-formed Steel Beamsmentioning

confidence: 99%

Web crippling capacities of rivet fastened rectangular hollow flange channel beams under one flange load cases

2016

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A new rivet fastened rectangular hollow flange channel beam (RHFCB) was proposed using an intermittently rivet fastening process as an alternative to welded beams. The rivet fastened RHFCB allows greater section optimisation and flexibility in designing suitable combinations of web and flange widths and thicknesses for many industrial applications. In the industrial applications of rivet fastened RHFCBs as flooring, roofing or modular building systems, their flanges will be fastened to supports, which will provide increased capacities. However no research has been conducted to investigate the web crippling capacities of RHFCBs with flanges unfastened and fastened to supports under one‐flange load cases. Similarly the applicability of current design rules for cold‐formed steel sections are not suitable for rivet fastened RHFCBs. Hence to address these issues, an experimental study was conducted to investigate the web crippling behaviour and capacities of RHFCBs based on the new AISI S909 standard test method. This study included rivet fastened RHFCBs with flanges unfastened and fastened to supports under End One Flange (EOF) and Interior One Flange (IOF) load cases. Tests with flanges fastened to supports showed that web crippling capacities increased by 39 and 5 % for EOF and IOF load cases. Comparisons of experimental web crippling capacity results with predictions using the current AS/NZS 4600 and AISI S100 design standards showed that web crippling design equations are conservative for rivet fastened RHFCBs with flanges unfastened and fastened to supports under EOF and IOF load cases. Hence new equations are proposed to determine the web crippling capacities of rivet fastened RHFCBs. This paper presents the details of this web crippling experimental study of rivet fastened RHFCB sections and the results.

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New design rules for lipped channel beams subject to web crippling under two-flange load cases

Cited by 76 publications

References 6 publications

Structural behaviour of optimized cold‐formed steel beams

Structural behaviour of optimized cold‐formed steel beams

Optimum Design of Cold‐formed Steel Beams: Particle Swarm Optimisation and Numerical Analysis

Web crippling capacities of rivet fastened rectangular hollow flange channel beams under one flange load cases

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