Lateral-torsional buckling of slender cross-section stainless steel beams

This study employs experiments and numerical simulation to analyze the dynamic response of steel beams under huge-mass impact. Results show that lateral torsional buckling (LTB) occurs for a narrow rectangular cross-section steel beam under transverse impact. The experiments were simulated using LS-DYNA. The numerical simulation is in good agreement with experimental results, thus indicating that the LTB phenomenon is the real tendency of steel beams under impact. Meanwhile, the study shows that LS-DYNA can readily predict the LTB of steel beams. A numerical simulation on the dynamic response of H-shaped cross-section steel beams under huge-mass impact is conducted to determine the LTB behavior. The phenomenon of dynamic LTB is illustrated by displacement, strain, and deformation of H-shaped steel beams. Thereafter, a parametric study is conducted to investigate the effects of initial impact velocity and momentum on LTB. The LTB of H-shaped cross-section steel beams under transverse impact is primarily dependent on the level of impact kinetic energy, whereas impact momentum has a minor effect on LTB mode.

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PARAMETRIC STUDY ON THE LATERAL TORSIONAL BUCKLING OF STAINLESS STEEL I BEAMS WITH CLASS 4 CROSS-SECTIONS IN CASE OF FIRE

Applications of Structural Fire Engineering ◽

10.14311/asfe.2015.020 ◽

2016 ◽

Author(s):

Nuno Lopes ◽

Pedro Gamelas ◽

Paulo Vila Real

Keyword(s):

Stainless Steel ◽

Cross Sections ◽

Elevated Temperatures ◽

Numerical Study ◽

Design Guidelines ◽

Steel Grade ◽

Steel Beams ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Steel Members

For predicting the behaviour of beams with thin-walled I sections, named Class 4 in Eurocode 3 (EC3), it is necessary to account for the occurrence of both local and lateral torsional buckling (LTB). These instability phenomena, which are intensified at elevated temperatures, should be accurately considered in design rules. The fire design guidelines for stainless steel members, given in Part 1-2 of EC3, propose the use of the same formulae developed for carbon steel (CS) elements. However, these two materials have different constitutive laws, leading to believe that the use of those formulae should be validated. This work presents a parametric numerical study on the behaviour of stainless steel beams with Class 4 I sections at elevated temperatures. The influences of several parameters such as stainless steel grade, loading type and cross section slenderness are evaluated, and comparisons between the obtained numerical results and EC3 rules are presented.

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Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment

Thin-Walled Structures ◽

10.1016/j.tws.2017.07.010 ◽

2017 ◽

Vol 119 ◽

pp. 586-592 ◽

Cited By ~ 4

Author(s):

R.S. Glauz

Keyword(s):

Steel Beams ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Cold Formed Steel

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A comparative study of beam design curves against lateral torsional buckling using AISC, EC and SP

Structural Mechanics of Engineering Constructions and Buildings ◽

10.22363/1815-5235-2019-15-1-25-32 ◽

2019 ◽

Vol 15 (1) ◽

pp. 25-32 ◽

Cited By ~ 2

Author(s):

Vera V Galishnikova ◽

Tesfaldet H Gebre

Keyword(s):

Steel Structures ◽

Reduction Factor ◽

Steel Beams ◽

Steel Beam ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Vertical Loading ◽

Beam Design ◽

Overall Stability

Introduction. Structural stability is an essential part of design process for steel structures and checking the overall stability is very important for the determination of the optimum steel beams section. Lateral torsional buckling (LTB) normally associated with beams subject to vertical loading, buckling out of the plane of the applied loads and it is a primary consideration in the design of steel structures, consequently it may reduce the load currying capacity. Methods. There are several national codes to verify the steel beam against LTB. All specifications have different approach for the treatment of LTB and this paper is concentrated on three different methods: America Institute of Steel Construction (AISC), Eurocode (EC) and Russian Code (SP). The attention is focused to the methods of developing LTB curves and their characteristics. Results. AISC specification identifies three regimes of buckling depending on the unbraced length of the member ( Lb ). However, EC and SP utilize a reduction factor (χ LT ) to treat lateral torsional buckling problem. In general, flexural capacities according to AISC are higher than those of EC and SP for non-compact sections.

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