Lateral Torsional Buckling of Partially Encased Composite Beams without Concrete Slab

2002 ◽  
Author(s):  
Joachim Lindner ◽  
Nikos Budassis
Keyword(s):  
Concrete Slab ◽  
Composite Beams ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling

Elastic Critical Moment of Lateral-Distortional Buckling of Steel-Concrete Composite Beams under Uniform Hogging Moment

2019 ◽  
Vol 19 (07) ◽  
pp. 1950079 ◽  
Author(s):  
João Victor Fragoso Dias ◽  
Janaina Pena Soares Oliveira ◽  
Adenilcia Fernanda Grobério Calenzani ◽  
Ricardo Hallal Fakury
Keyword(s):  
Numerical Models ◽  
Concrete Slab ◽  
Horizontal Displacement ◽  
Composite Beams ◽  
Bottom Flange ◽  
Distortional Buckling ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Average Deviation ◽  
Critical Moment

Great attention has been given in the last few years to steel–concrete composite beams due to the gains in strength that can be obtained with the small cost of installing a shear connection between the steel profile and the concrete slab. In continuous and semicontinuous composite beams close to the internal supports, hogging bending moments are developed and the compressed bottom flange may buckle laterally in an unstable way known as the lateral-distortional buckling, characterized by a horizontal displacement and twist of the bottom flange with an out-of-plane distortion of the web. In the literature, several formulations were proposed to determine the critical moment for this type of buckling. Among them, some of the most relevant are presented by [K. Roik, G. Hanswille and J. Kina, Solution for the lateral torsional buckling problem of composite beams (in German), Stahlbau 59 (1990)] and [G. Hanswille, J. Lindner and D. Munich, Lateral torsional buckling of composite beams (in German), Stahlbau 67 (1998)]. In the present work, a new procedure is developed to determine the elastic critical moment of lateral–distortional buckling of composite beams under uniform hogging moment. To assess and calibrate this procedure, 7[Formula: see text]772 numerical models were analyzed by the finite element code ANSYS and the results were compared with the ones obtained from the new proposed formulas. The procedure presented excellent agreement with the numerical results, with an average deviation of 2.33% from the computational simulations. The formulations of [K. Roik, G. Hanswille and J. Kina, Solution for the lateral torsional buckling problem of composite beams (in German), Stahlbau 59 (1990)] and [G. Hanswille, J. Lindner and D. Munich, Lateral torsional buckling of composite beams (in German), Stahlbau 67 (1998)] did not lead to such satisfactory results, presenting an average deviation of 12.41% and 16.51%, respectively.

Analysis of rotational stiffness of steel-concrete composite beams for lateral-torsional buckling

2019 ◽  
Vol 198 ◽  
pp. 109554 ◽  
Author(s):  
Mateus Zimmer Dietrich ◽  
Adenilcia Fernanda Grobério Calenzani ◽  
Ricardo Hallal Fakury
Keyword(s):  
Composite Beams ◽  
Rotational Stiffness ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling

Rotational stiffness of continuous composite beams with sinusoidal-web profiles for lateral-torsional buckling

2012 ◽  
Vol 79 ◽  
pp. 22-33 ◽  
Author(s):  
Adenilcia F.G. Calenzani ◽  
Ricardo H. Fakury ◽  
Fernando A. de Paula ◽  
Francisco C. Rodrigues ◽  
Gilson Queiroz ◽  
...  
Keyword(s):  
Composite Beams ◽  
Rotational Stiffness ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling

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

1994 ◽  
Vol 21 (2) ◽  
pp. 329-339
Author(s):  
G. Dionne ◽  
D. Beaulieu ◽  
A. Picard
Keyword(s):  
Experimental Study ◽  
Key Words ◽  
Experimental Work ◽  
Concrete Slab ◽  
Steel Beams ◽  
Flexural Stiffness ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Composite Action ◽  
Slender Beams

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.

Experimental and numerical study on the lateral torsional buckling of full-scale steel-timber composite beams

2021 ◽  
pp. 136943322110572
Author(s):  
Ying Gao ◽  
Feiyang Xu ◽  
Xinmiao Meng ◽  
Ye Zhang ◽  
Hongda Yang
Keyword(s):  
Composite Beam ◽  
Numerical Study ◽  
Shear Stiffness ◽  
Composite Beams ◽  
Full Scale ◽  
Physical Parameters ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Interface Shear ◽  
Composite Action

The lateral torsional buckling (LTB) of steel-timber composite (STC) beam with partial interaction was investigated in this paper. The composite beam is constructed by connecting the timber to both flanges of the H-shaped steel with bolts or screws. Twelve push-out specimens were designed to evaluate the shear performance of bolt or screw connectors. It was shown that the slip stiffness and the shear bearing capacity of the connectors increased with the thickness of timber increasing. Then, eight full-scale composite beams with lengths of 6000 mm were studied through bending tests and compared to a bare steel beam. The experimental behaviors of the specimens were identified, including the failure mode, load-deflection relationship and load-strain response. The LTB phenomenon and composite action were discussed by analyzing the strain distribution, stiffness and strength. The results demonstrated that the STC beams fastened with bolts or screws displayed partial composite action. Although the stiffness of the composite beam showed little augmentation, the maximum strength of the composite beam substantially increased by suppressing the LTB phenomenon. A finite element analysis was conducted to reveal the failure mechanism of the specimens with different geometric and physical parameters, including the number of timber layers, the interface shear stiffness and the initial imperfection. It was found that increasing the number of timber layers in the upper flange suppressed the lateral torsional buckling, and the interface shear stiffness was the key factor to control the stiffness and failure modes of STC beams.

scholarly journals Lateral-Torsional Buckling Analysis for Doubly Symmetric Tubular Flange Composite Beams with Lateral Bracing under Concentrated Load

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2328
Author(s):  
Yingchun Liu ◽  
Ziwen He ◽  
Wenfu Zhang ◽  
Jing Ji ◽  
Yuchen Liu ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Composite Beams ◽  
Thickness Ratio ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Concentrated Load ◽  
Critical Moment ◽  
Steel Ratio ◽  
Overall Stability ◽  
Lateral Bracing

Tubular flange composite beams are increasingly applied in modern bridge structures. In order to investigate the overall stability behavior of doubly symmetric tubular flange composite beams with lateral bracing under concentrated load, the analysis of elastic lateral-torsional buckling is conducted by the energy variation method. The analytical solution of critical moment of doubly symmetric tubular flange composite beams with lateral bracing is obtained. Meanwhile, the simplified calculation formula of critical moment is fitted by 1stOpt software based on 26,000 groups of data, and the accuracy is verified by the finite element method. It is found that, the critical moment rises obviously with increasing lateral bracing stiffness, and adding lateral bracing to doubly symmetric tubular flange composite beams is beneficial to improve the overall stability in engineering practice. Finally, the influence of several parameters including concrete strength, span, steel ratio of flange and height-thickness ratio of web are studied. The results show that the concrete strength and the web height-thickness ratio have a weak influence on critical moment of elastic lateral-torsional buckling, while the influence of span-depth ratio and flange steel ratio is very significant.

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