Elastic buckling of cold-formed steel columns and beams with holes

Moen, Cristopher D.; Schafer, Benjamin W.

doi:10.1016/j.engstruct.2009.07.007

Cited by 125 publications

(95 citation statements)

References 6 publications

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“…However, there are no specific design guidelines for cold-formed steel members at elevated temperatures. Hence extensive research efforts have gone into the many investigations addressing the buckling behaviour of cold-formed steel columns at ambient and elevated temperatures [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures

Gunalan

Heva

Mahendran

2014

Engineering Structures

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a b s t r a c tCurrent design rules for the member capacities of cold-formed steel columns are based on the same nondimensional strength curve for both fixed and pinned-ended columns at ambient temperature. This research has investigated the accuracy of using current ambient temperature design rules in Australia/ New Zealand (AS/NZS 4600), American (AISI S100) and European (Eurocode 3 Part 1.3) standards in determining the flexural-torsional buckling capacities of cold-formed steel columns at uniform elevated temperatures using appropriately reduced mechanical properties. It was found that these design rules accurately predicted the member capacities of pin ended lipped channel columns undergoing flexural torsional buckling at elevated temperatures. However, for fixed ended columns with warping fixity undergoing flexural-torsional buckling, the current design rules significantly underestimated the column capacities as they disregard the beneficial effect of warping fixity. This paper has therefore recommended the use of improved design rules developed for ambient temperature conditions to predict the axial compression capacities of fixed ended columns subject to flexural-torsional buckling at elevated temperatures within AS/NZS 4600 and AISI S100 design provisions. The accuracy of the proposed fire design rules was verified using finite element analysis and test results of cold-formed lipped channel columns at elevated temperatures except for low strength steel columns with intermediate slenderness whose behaviour was influenced by the increased nonlinearity in the stress-strain curves at elevated temperatures. Further research is required to include these effects within AS/NZS 4600 and AISI S100 design rules. However, Eurocode 3 Part 1.3 design rules can be used for this purpose by using suitable buckling curves as recommended in this paper.

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Section: Introductionmentioning

confidence: 99%

Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures

Gunalan

Heva

Mahendran

2014

Engineering Structures

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“…b eh is estimated using Eq.2 based on Chinese cold-formed steel specification, but the plates adjacent to the slotted hole or multiple slotted holes are as the unstiffened strip and k of the unstiffened strip should be calculated using Eq.3 when the influence of slotted holes is considered [11] refer to the North America cold-formed steel specification.…”

Section: (1)mentioning

confidence: 99%

“…The elastic buckling analysis of plate with holes under axial compression and bending [10] demonstrated that holes might create unique buckling modes, and could either decrease or increase a plate's critical elastic buckling stress depending on the hole's geometry and spacing. Based on the elastic buckling analysis of cold-formed steel columns and beams with holes [11], the calculated methods for elastic global, distortional and local buckling strength of a cold-formed steel member with holes under axial compression and bending have been put forward. The short and intermediate length stud columns with holes tests were conducted [12] and the experiments showed that slotted web holes have a minimal influence on the tested ultimate strength in the specimens considered.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Design Method on Cold-Formed Thin-Walled Steel Lipped Channel Columns with Slotted Web Holes Under Axial Compression

Yao¹

2017

TOCIEJ

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Background:Cold-formed steel structural sections used in the walls of residential buildings and agricultural facilities are commonly C-shaped sections with web holes. These holes located in the web of sections can alter the elastic stiffness and the ultimate strength of a structural member. The objective of this paper is to study the buckling mode and load-carrying capacity of cold-formed thin-walled steel column with slotted web holes. Methods:Compression tests were conducted on 26 intermediate length columns with and without holes. The tested compressive members included four different kinds of holes. For each specimen, a shell finite element Eigen-buckling analysis and nonlinear analysis were also conducted. The influence of the slotted web hole on local and distortional buckling response had also been studied. The comparison on ultimate strength between test results and calculated results using Chinese cold-formed steel specification GB50018-2002, North American cold-formed steel specification AISI S100-2016, and nonlinear Finite Element method was made. Result:Test results showed that the distortional buckling occurred for intermediate columns with slotted holes and the ultimate strength of columns with holes was less than that of columns without holes. The ultimate strength of columns decreased with the increase in transverse width of hole in the cross-section of member. The Finite element analysis results showed that the web holes could influence on the elastic buckling stress of columns. The shell finite element could be used to model the buckling modes and analysis the ultimate strength of members with slotted web holes. The calculated ultimate strength shows that results predicted with AISI S100-2016 and analyzed using finite element method are close to test results. The calculated results using Chinese code are higher than the test results because Chinese code has no provision to calculate the ultimate strength of members with slotted web holes. Conclusion:The calculated method for cold-formed thin-walled steel columns with slotted web holes are proposed based on effective width method in Chinese code. The results calculated using the proposed method show good agreement with test results and can be used in engineering design for some specific cold-formed steel columns with slotted web holes studied in this paper.

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“…The thickness of these columns normally varies between 1.8 mm and 3.0 mm. Perforations in columns reduce their cross-sectional area and make them vulnerable for local and/or distortional buckling [4]. A global buckling of the structure may also happen if these columns are not properly designed.…”

Section: Introductionmentioning

confidence: 99%

Structural Performance of Boltless Beam End Connectors

Shah¹,

Sulong²,

Khan³

et al. 2017

Volume 13 Number 2

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This study examines the structural performance of beam end connectors used as connection device in semi-rigid boltless beam-to-column connections (BCCs) in steel pallet racks (SPRs). A total of six types of specimens were tested which were distinguished by the three different types of beam end connector (BEC) thicknesses and two different numbers of tabs in the (BEC). The experimental testing was performed using double-cantilever test method and the moment-rotation (M-θ) behavior of the connections and key failure modes were evaluated. The influence of variation in the thickness and the number of tabs of the BEC on the behavior of connection was also investigated. Increased connector thickness enabled the connector tabs to sustain higher failure moment. The findings showed that by varying the geometrical properties, the stiffness of the connection was affected at a higher rate as compared to the strength of the connection. A non-linear three dimensional (3D) finite element (FE) model was developed to simulate the experimental investigations. The FE model showed a close agreement with experimental results.

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Elastic buckling of cold-formed steel columns and beams with holes

Cited by 125 publications

References 6 publications

Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures

Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures

Experiment and Design Method on Cold-Formed Thin-Walled Steel Lipped Channel Columns with Slotted Web Holes Under Axial Compression

Structural Performance of Boltless Beam End Connectors

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