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Structural performance of composite beams using advanced modeling for nonlinear analysis
Rendimiento estructural de vigas compuestas mediante modelado avanzado para análisis no lineal
DOI:
https://doi.org/10.15446/dyna.v92n238.119561Palabras clave:
concrete, composite beam, reinforcement, crack, finite elements (en)hormigón, viga compuesta, reforzamiento, grieta, elementos finitos (es)
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A few studies used full-embedded steel sections in composite beams to reduce their cross sections. This paper presents the behavior of normal and high-strength composite beams having various heights of full-embedded steel sections. The stirrups and compression reinforcement details of the beams were the same. The finite element method was adopted in the 3D nonlinear analysis of the presented study. Full-scale composite models were investigated and tested under four-point bending. The load-deflection behavior including the elastic and post-cracking stages was monitored in this paper. Furthermore, the stress distribution of embedded steel sections, crack patterns, and modes of failure of the composite beams were investigated and studied. The results showed that the implemented analytical models were accurate, in which the error percentage was only 1.3%. The high-strength concrete composite beams showed more strength and ductile failure than those with normal strength. Also, the full-embedded steel sections have fully or partially yielded.
Algunos estudios utilizaron secciones de acero completamente embebidas en vigas compuestas para reducir sus secciones transversales. Este artículo presenta el comportamiento de vigas compuestas normales y de alta resistencia con varias alturas de secciones de acero completamente embebidas. Los detalles de los estribos y el refuerzo de compresión de las vigas fueron los mismos. El método de elementos finitos se adoptó en el análisis no lineal 3D del estudio presentado. Se investigaron y probaron modelos compuestos a escala real bajo flexión en cuatro puntos. En este artículo se monitoreó el comportamiento de carga-deflexión, incluyendo las etapas elásticas y post-fisuración. Además, se investigó y estudió la distribución de tensiones de las secciones de acero embebidas, los patrones de fisuración y los modos de fallo de las vigas compuestas. Los resultados mostraron que los modelos analíticos implementados fueron precisos, en los que el porcentaje de error fue de solo 1.3%. Las vigas compuestas de hormigón de alta resistencia mostraron mayor resistencia y fallo dúctil que aquellas con resistencia normal. Además, las secciones de acero completamente embebidas han cedido total o parcialmente.
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