scholarly journals Numerical analysis of the torsional and flexural‐torsional buckling behaviour of compressed steel members at elevated temperature

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1239-1245
Author(s):  
Luca Possidente ◽  
Nicola Tondini ◽  
Jean‐Marc Battini
Keyword(s):  
Elevated Temperature ◽  
Numerical Analysis ◽  
Torsional Buckling ◽  
Steel Members ◽  
Flexural Torsional Buckling

Fire buckling curves for torsionally sensitive steel members subjected to axial compression

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Luca Possidente ◽  
Nicola Tondini ◽  
Jean-Marc Battini
Keyword(s):  
Elevated Temperature ◽  
Practical Interest ◽  
Statistical Investigation ◽  
Truss Structures ◽  
Design Standards ◽  
Torsional Buckling ◽  
Content Type ◽  
Steel Members ◽  
Class 1 ◽  
Flexural Torsional Buckling

PurposeBuckling should be carefully considered in steel assemblies with members subjected to compressive stresses, such as bracing systems and truss structures, in which angles and built-up steel sections are widely employed. These type of steel members are affected by torsional and flexural-torsional buckling, but the European (EN 1993-1-2) and the American (AISC 360-16) design norms do not explicitly treat these phenomena in fire situation. In this work, improved buckling curves based on the EN 1993-1-2 were extended by exploiting a previous work of the authors. Moreover, new buckling curves of AISC 360-16 were proposed.Design/methodology/approachThe buckling curves provided in the norms and the proposed ones were compared with the results of numerical investigation. Compressed angles, tee and cruciform steel members at elevated temperature were studied. More than 41,000 GMNIA analyses were performed on profiles with different lengths with sections of class 1 to 3, and they were subjected to five uniform temperature distributions (400–800 C) and with three steel grades (S235, S275, S355).FindingsIt was observed that the actual buckling curves provide unconservative or overconservative predictions for various range of slenderness of practical interest. The proposed curves allow for safer and more accurate predictions, as confirmed by statistical investigation.Originality/valueThis paper provides new design buckling curves for torsional and flexural-torsional buckling at elevated temperature since there is a lack of studies in the field and the design standards do not appropriately consider these phenomena.

Torsional and flexural-torsional buckling of compressed steel members in fire

2020 ◽  
Vol 171 ◽  
pp. 106130
Author(s):  
Luca Possidente ◽  
Nicola Tondini ◽  
Jean-Marc Battini
Keyword(s):  
Torsional Buckling ◽  
Steel Members ◽  
Flexural Torsional Buckling ◽  
In Fire

scholarly journals The new buckling curves for cold-formed stainless steel equal-leg angle columns

2021 ◽  
Vol 64 (3) ◽  
pp. 171-176
Author(s):  
Jelena Dobrić ◽  
Aljoša Filipović ◽  
Nancy Baddoo ◽  
Zlatko Marković ◽  
Dragan Buđevac
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Numerical Analysis ◽  
Structural Elements ◽  
European Standard ◽  
Torsional Buckling ◽  
Steel Alloys ◽  
Design Rules ◽  
Flexural Torsional Buckling ◽  
Geometric Nonlinear Analysis

The design rules for centrically compressed stainless steel equal-leg angle members are not explicitly stated in the current European standard SRPS EN 1993-1-4. This paper summarizes the results of extensive research conducted on this type of structural elements aiming to define recommendations for their design. Based on a systematic experimental investigation, a detailed numerical analysis was performed, and a database of columns' resistances were defined. Material and geometric nonlinear analysis included three key stainless steel alloys, austenitic, ferritic and duplex. The design curves for flexural and flexural-torsional buckling check have been proposed in accordance with European codified procedures.

Lateral Torsional-Buckling of Class 4 Steel Plate Beams at Elevated Temperature: Experimental and Numerical Comparison

2015 ◽  
Vol 6 (3) ◽  
pp. 223-236 ◽  
Author(s):  
Martin Prachar ◽  
Michal Jandera ◽  
Frantisek Wald ◽  
Bin Zhao
Keyword(s):  
Elevated Temperature ◽  
Cross Sections ◽  
Elevated Temperatures ◽  
Numerical Comparison ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Ongoing Research ◽  
Steel Members ◽  
Set Up ◽  
Hot Rolled

This paper presents ongoing research in behaviour of laterally unrestrained beams (I or H section) of Class 4 cross-sections at elevated temperatures, which is based on the RFCS project FIDESC4 - Fire Design of Steel Members with Welded or Hot-rolled Class 4 Cross-sections. Despite the current EC3 contains a number of simple rules for design of slender Class 4 cross-sections at elevated temperature, based on recent numerical simulations they were found to be over-conservative. Therefore, new well representing design models, which simulate the actual behaviour of the structures exposed to fire, are crucial. These design rules should be based on extensive numerical simulation validated on experimental data. Within this task, several tests were carried out to study lateral torsional buckling of Class 4 beams in fire. The design of the test set-up and description of the experiment is given, as well as verification of numerical model.

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

2020 ◽  
Vol 982 ◽  
pp. 201-206
Author(s):  
Jaksada Thumrongvut ◽  
Natthawat Pakwan ◽  
Samaporn Krathumklang
Keyword(s):  
Buckling Load ◽  
Fiber Reinforced Polymer ◽  
Width Ratio ◽  
Fiber Reinforced ◽  
Torsional Buckling ◽  
Eccentric Load ◽  
Buckling Loads ◽  
Reinforced Polymer ◽  
Cross Sectional Dimension ◽  
Flexural Torsional Buckling

In this paper, the experimental study on the pultruded fiber-reinforced polymer (pultruded FRP) angle beams subjected to transversely eccentric load are presented. A summary of critical buckling load and buckling behavior for full-scale flexure tests with various span-to-width ratios (L/b) and eccentricities are investigated, and typical failure mode are identified. Three-point flexure tests of 50 pultruded FRP angle beams are performed. The E-glass fibre/polyester resin angle specimens are tested to examine the effect of span-to-width ratio of the beams on the buckling responses and critical buckling loads. The angle specimens have the cross-sectional dimension of 76x6.4 mm with span-to-width ratios, ranging from 20 to 40. Also, four different eccentricities are investigated, ranging from 0 to ±2e. Eccentric loads are applied below the horizontal flange in increments until beam buckling occurred. Based upon the results of this study, it is found that the load and mid-span vertical deflection relationships of the angle beams are linear up to the failure. In contrast, the load and mid-span lateral deflection relationships are geometrically nonlinear. The general mode of failure is the flexural-torsional buckling. The eccentrically loaded specimens are failed at critical buckling loads lower than their concentric counterparts. Also, the quantity of eccentricity increases as buckling load decreases. In addition, it is noticed that span-to-width ratio increases, the buckling load is decreased. The eccentric location proved to have considerable influence over the buckling load of the pultruded FRP angle beams.

scholarly journals The effect of flexural–torsional buckling on the stability of timber members: a case study

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
Osama A. B. Hassan
Keyword(s):  
Axial Compression ◽  
Bending Moment ◽  
List Type ◽  
Torsional Buckling ◽  
Solution Methods ◽  
Simplified Solution ◽  
The Stability ◽  
Flexural Torsional Buckling ◽  
Building Engineering

Abstract This study investigates the stability of timber members subjected to simultaneously acting axial compression and bending moment, with possible risk for torsional and flexural–torsional buckling. This situation can occur in laterally supported members where one side of the member is braced but the other side is unbraced. In this case, the free side will buckle out of plane while the braced side will be prevented from torsional and flexural–torsional buckling. This problem can be evident for long members in timber-frame structures, which are subjected to high axial compression combined with bending moments in which the member is not sufficiently braced at both sides. This study is based on the design requirement stated in Eurocode 5. Solution methods discussed in this paper can be of interest within the framework of structural and building Engineering practices and education in which the stability of structural elements is investigated. Article Highlights This case study investigates some design situations where the timber member is not sufficiently braced. In this case, a stability problem associated with combined torsional buckling and flexural buckling can arise. The study shows that the torsional and/or flexural–torsional buckling of timber members can be important to control in order to fulfil the criteria of the stability of the member according to Eurocode 5 and help the structural engineer to achieve safer designs. The study investigates also a simplified solution to check the effect of flexural torsional buckling of laterally braced timber members.

Study of flexural–torsional buckling behaviour of 6061-T6 aluminium alloy unequal-leg angle columns

2021 ◽  
Vol 164 ◽  
pp. 107821
Author(s):  
Ying Zhang ◽  
Yidu Bu ◽  
Yuanqing Wang ◽  
Zhongxing Wang ◽  
Yuanwen Ouyang
Keyword(s):  
Aluminium Alloy ◽  
Torsional Buckling ◽  
Flexural Torsional Buckling

Optimization of cold-formed steel pallet racking cross-sections for flexural–torsional buckling with constraints on the geometry

2009 ◽  
Vol 31 (11) ◽  
pp. 2711-2722 ◽  
Author(s):  
M.M. Pastor ◽  
M. Casafont ◽  
E. Chillarón ◽  
A. Lusa ◽  
F. Roure ◽  
...  
Keyword(s):  
Cross Sections ◽  
Torsional Buckling ◽  
Cold Formed Steel ◽  
Flexural Torsional Buckling
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