Évaluation expérimentale et renforcement des ponts en acier avec dalle de béton non participante

An experimental study was carried out to assess the stabilizing action of the friction between concrete slab and steel beams in noncomposite constructions. Slender beams, sensitive to lateral torsional buckling, were used in the experimental work. The results show that the friction is sufficient to prevent lateral torsional buckling of the steel beams. However, the flexural stiffness was not significantly increased so that friction alone is not sufficient to develop a composite action. To increase the frictional effect, the concrete slab was linked to the steel beams by two types of connectors. Additional tests were carried out to verify the efficiency of these connectors. Key words: steel bridges, lateral torsional buckling, composite action friction, reinforcement.

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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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