Publicado

2018-10-01

Experimental assessment of I-shaped steel beams with longitudinal stiffeners under lateral-torsional buckling

Evaluación experimental de vigas de acero en I con rigidizadores longitudinales ante el pandeo lateral torsional

Palabras clave:

longitudinal stiffeners, lateral-torsional buckling, lateral displacement, laterally unbraced length, I-shaped beam, failure twist angle, flexural capacity (en)
rigidizadores longitudinales, pandeo lateral torsional, desplazamiento lateral, longitud no soportada lateralmente, vigas I, ángulo de giro de falla, capacidad a flexión (es)

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This study focused on the experimental assessment of the behavior of I-shaped steel beams with longitudinal stiffeners under the action of lateral-torsional buckling. Thirty-three IPE-140 steel beams with and without longitudinal stiffeners were tested under simple-support conditions with a laterally unbraced length ranging from 0.69 to 6.0 m. The stiffeners spacing was 0.42 m, which represented three times the depth of the section. The structural behavior of the beams is discussed in terms of their flexural capacity, the lateral displacement of the compression flange and the failure twist angle. The results showed that the use of longitudinal stiffeners increased the flexural capacity up to 82%, decreased the lateral displacement of the compression flange and the failure twist angle up to 72 and 90% respectively, with respect to the specimens without stiffeners.
Este estudio se enfocó en la evaluación experimental del comportamiento de vigas de acero de sección en I con rigidizadores longitudinales bajo la acción del pandeo lateral torsional. Treinta y tres (33) vigas de acero IPE-140 simplemente apoyadas con y sin rigidizadores longitudinales fueron ensayadas con una longitud no soportada lateralmente de 0.69 a 6.0 m. El espaciamiento de los rigidizadores fue de 0.42 m, que representó tres veces el peralte de la sección. El comportamiento estructural de las vigas se analizó en términos de su capacidad a flexión, el desplazamiento lateral del patín a compresión y el ángulo de giro de falla. Los resultados indicaron que el uso de rigidizadores longitudinales aumentó la capacidad a flexión hasta un 82% y disminuyó el desplazamiento lateral del patín a compresión y el ángulo de giro de falla hasta un 72 y 90% respectivamente, con respecto a los especímenes sin rigidizadores.

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