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Flexural behavior of castellated partially encased composite (PEC) beams
Abstract This study undertakes a comprehensive experimental and numerical assessment of the flexural behavior of two innovative configurations of partially encased composite (PEC) beams, incorporating H-shaped castellated and T-shaped castellated main steel components (MSCs). Seven test specimens, i.e., two traditional PEC specimens featuring H-shaped solid-web MSC, two PEC specimens with H-shaped castellated MSC (PEC-HC), one PEC specimen with a T-shaped castellated MSC (PEC-TC), and two bare steel beams, are subjected to pure static bending. The experimental outcomes manifest diverse failure mechanisms across the examined specimens. The measured flexural strength of the traditional PEC specimens and the PEC-TC specimen closely aligns with the theoretical plastic moment capacity of composite beam section. However, the observed strength of the PEC-HC specimens surpasses the theoretical plastic moment capacity by at least 20%. The compressive flange and the embedded concrete significantly enhance the flexural strength and deformability of the beams, while shear force exerts a detrimental impact on their flexural resistance. Replacing solid-web MSCs with castellated MSCs markedly increases the strength of the composite beams without altering the steel consumption, although ductility may be compromised due to excessively increased section height. Web openings within the MSC reduce the flexural strength of the PEC beams but exert a negligible impact on their stiffness. Among the variants, PEC-HC beams with circular web openings exhibit superior strength, while those with quadrilateral web openings shows the lowest strength. In addition, stress concentration at the compromised sections of the MSCs in the PEC-HC beams triggers fracture in the tensile steel flange.
Highlights Two novel castellated partially encased composite (PEC) beams are proposed. Both experimental and numerical investigations on novel and traditional PEC beams are conducted. Comparison of flexural behavior between novel and traditional PEC beams is conducted. Influences of web openings, compressive steel flange and infilled concrete on beam behavior are investigated. Capacity of novel PEC beams is assessed by plastic method of composite beam section.
Flexural behavior of castellated partially encased composite (PEC) beams
Abstract This study undertakes a comprehensive experimental and numerical assessment of the flexural behavior of two innovative configurations of partially encased composite (PEC) beams, incorporating H-shaped castellated and T-shaped castellated main steel components (MSCs). Seven test specimens, i.e., two traditional PEC specimens featuring H-shaped solid-web MSC, two PEC specimens with H-shaped castellated MSC (PEC-HC), one PEC specimen with a T-shaped castellated MSC (PEC-TC), and two bare steel beams, are subjected to pure static bending. The experimental outcomes manifest diverse failure mechanisms across the examined specimens. The measured flexural strength of the traditional PEC specimens and the PEC-TC specimen closely aligns with the theoretical plastic moment capacity of composite beam section. However, the observed strength of the PEC-HC specimens surpasses the theoretical plastic moment capacity by at least 20%. The compressive flange and the embedded concrete significantly enhance the flexural strength and deformability of the beams, while shear force exerts a detrimental impact on their flexural resistance. Replacing solid-web MSCs with castellated MSCs markedly increases the strength of the composite beams without altering the steel consumption, although ductility may be compromised due to excessively increased section height. Web openings within the MSC reduce the flexural strength of the PEC beams but exert a negligible impact on their stiffness. Among the variants, PEC-HC beams with circular web openings exhibit superior strength, while those with quadrilateral web openings shows the lowest strength. In addition, stress concentration at the compromised sections of the MSCs in the PEC-HC beams triggers fracture in the tensile steel flange.
Highlights Two novel castellated partially encased composite (PEC) beams are proposed. Both experimental and numerical investigations on novel and traditional PEC beams are conducted. Comparison of flexural behavior between novel and traditional PEC beams is conducted. Influences of web openings, compressive steel flange and infilled concrete on beam behavior are investigated. Capacity of novel PEC beams is assessed by plastic method of composite beam section.
Flexural behavior of castellated partially encased composite (PEC) beams
Zhao, Bida (author) / Huo, Hongwei (author) / Ran, Cuiling (author) / Fang, Cheng (author) / Wang, Wei (author) / Zhou, Haijing (author)
2024-01-24
Article (Journal)
Electronic Resource
English
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