Extending the Direct Strength Method for Cold-Formed Steel Design to Through-Fastened Simple Span Girts and Purlins with Laterally Unbraced Compression Flanges

Gao, Tian; Moen, Cristopher D.

doi:10.1061/(asce)st.1943-541x.0000860

Cited by 16 publications

(11 citation statements)

References 6 publications

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“…The DSM has been further investigated in detail for compression members, flexural members, combined bending and compression, members in shear and the interaction between the modes. The references are for column design (De Miranda et al, 2014; He et al, 2014; He and Zhou, 2014; Landesmann and Camotim, 2013; Young et al, 2013), for beam/purlin design (Basaglia and Camotim, 2013; Basaglia et al, 2014a; Gao and Moen, 2014; Keerthan and Mahendran, 2014a; Kumar and Kalyanaraman, 2014; Pham and Hancock, 2013a), for shear design (Pham et al, 2014a, 2014b, 2014d; Pham and Hancock, 2014) and for structural systems (Camotim and Basaglia, 2014). As for buckling, there is a need to review some of the design rules in existing standards and specifications to further account for interaction.…”

Section: Section Buckling and Design Including Gbt Fsm And Dsmmentioning

confidence: 99%

Cold-formed steel structures: Research review 2013–2014

Hancock

2016

Advances in Structural Engineering

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This article reviews research on cold-formed steel structures published in 2013 and 2014 in three leading journals: the Journal of Structural Engineering, ASCE, Thin-Walled Structures and the Journal of Constructional Steel Research. It also reviews papers published in the three main conferences in the area over the same period. These are Eurosteel 2014 (Naples, Italy), the 7th International Conference on Thin-Walled Structures (Busan, Korea) and the 22nd International Specialty Conference on Cold-Formed Steel Structures (St Louis, MO, USA). Three research areas which have recently been incorporated in the North American Specification NAS S100:2012 or are being incorporated in the Australian/New Zealand Standard AS/NZS 4600 have been highlighted. These are the works on the semi-analytical finite strip method for sections in shear by the author and his colleagues at the University of Sydney, net section rupture by Associate Professor Lip Teh at the University of Wollongong and fire design by Professor Mahendran at Queensland University of Technology.

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Section: Section Buckling and Design Including Gbt Fsm And Dsmmentioning

confidence: 99%

Cold-formed steel structures: Research review 2013–2014

Hancock

2016

Advances in Structural Engineering

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“…e results formed the basis for a new design method adopted in American standards (AISI-S210-10) [17] for incorporating restraint into design strength predictions for the distortional buckling mode. Gao and Moen [18,19] proposed mechanics-based equations for predicting the rotational restraint provided by through-fastened metal panels to Z-and C-section girts or purlins. e prediction equations were validated by conducting rotational restraint experiments, and the through-fastened connection stiffness was also simulated in a finite strip elastic buckling analysis with a rotational spring to demonstrate how system effects can be included in design.…”

Section: Introductionmentioning

confidence: 99%

Rotational Restraint to Purlins Provided by Standing Seam Roof Systems

Qin

Luan

et al. 2019

Advances in Civil Engineering

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The finite element model used for analyzing the rotational restraint rigidity of standing seam roof systems was developed. The influences of different factors on the rotational restraint rigidity provided by two types of standing seam roof systems were studied. The variables include local deformation of standing seam roof panels, panel thickness, clip tab thickness, and the relative sliding of clip tab and clip base. The restraint mechanism of standing seam roof systems to the purlins was studied. It is shown that the rotational restraint rigidity provided by the two types of researching standing seam roof systems mainly depends on the slide tab thickness and the roof panel thickness. Finally, formulae for calculating rotational restraint rigidity of the LSIII and SS360 standing seam roof systems were also proposed based on parametric analysis results.

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“…When the purlin is under uplift loading and the compressive flange is unrestrained, its failure load will approach the flexural-torsional buckling strength asymptotically due to the torsional effect from the eccentric load at the shear center. There are reports (Gao and Moen, 2013a; Hancock et al, 1990; Rousch and Hancock, 1997) on the global or local buckling problems in the unrestrained bottom flange of purlins under uplifting wind load. Experimental study (Pham and Hancock, 2009) showed that the restraining effect provided by the sheeting can strengthen the buckling capacity of the purlin.…”

Section: Introductionmentioning

confidence: 99%

Buckling behavior of cold-formed C/Z-section purlins incorporating the effects of diaphragm and the screw location

Yang

Bai

2019

Advances in Structural Engineering

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This article presents a study on the impact of the screw location and the diaphragm effects on the buckling behavior of the simply supported C/Z-section purlins under wind uplift loadings. The diaphragm effects provided by the sheeting and the warping-torsional effect induced by load eccentricity are taken into account in the differential equations of the nonlinear twisting flexural-torsional model. The biaxial bending moments, bi-moments, as well as the flexural-torsional buckling load of the purlin can be numerically obtained with the proposed model. The global, local, and distortional buckling interaction behavior and the limit states capacities are formulated based on the modified Direct Strength Method. The effects of both the restraints provided by the sheeting and impact of the screw location on the mechanical performance of the purlins are evaluated with the proposed method. The relationship between the buckling load and rotational restraint stiffness is also provided. The proposed methodology will contribute to the assessment of buckling capacity of purlin-sheeting systems.

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Extending the Direct Strength Method for Cold-Formed Steel Design to Through-Fastened Simple Span Girts and Purlins with Laterally Unbraced Compression Flanges

Cited by 16 publications

References 6 publications

Cold-formed steel structures: Research review 2013–2014

Cold-formed steel structures: Research review 2013–2014

Rotational Restraint to Purlins Provided by Standing Seam Roof Systems

Buckling behavior of cold-formed C/Z-section purlins incorporating the effects of diaphragm and the screw location

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