Abstract
In this study, six full-scaled models of RC floors supported by cold-form steel sections have been tested. Each model consists of RC 75mm thick slab supported on two parallel cold-formed steel beams with a span of 3m and spacing of 500mm. The slab has an overhang part of 250mm on each side. In the first and fourth models, the slab has been casted directly on the top flanges with no shear connector to simulate the effectiveness of friction in resisting of the lateral-torsional buckling. Shear studs have been drilled in the second and fifth models to ensure the composite action. Finally, the flanges have been embedded for the third and sixth models. A single channel beam is used in the first, second, and third models while a built-up beam is used in the fourth, fifth, and sixth models. Each model has been loaded up to failure under a pure bending with two-line loads located at the third points. Data for loads, deformations, and strains have been gathered. Except the fourth and the sixth models that failed in local buckling modes, all other models failed in global lateral-torsional buckling modes. For the single beam models; the load carrying capacity of the non-composite model is 82.9% less than the capacity of the composite models with shear studs and embedded flange. For the built-up models; the load carrying capacity of the non-composite model is 44.2 % less than the loads of the composite model with shear stud and 48.7% less than the model with the embedded flange.
Highlights
During the last few decades the using of the Cold-formed steel beams has increased significantly where they have been utilized as floor beams
Anbarasu dealt with the ultimate strength, post-buckling behavior and design of cold-formed steel lipped channel beams affected by local-distortional buckling mode interaction and subjected to uniform bending about the major axis in 2016 [4]
A premature failure mode was noted in M1. This may be due to the imperfection in the steel beams that have been noted during the casting and transformation processes
Summary
During the last few decades the using of the Cold-formed steel beams has increased significantly where they have been utilized as floor beams. Pi et al [2] provided a numerical investigation using an advanced finite-element model to study the elastic lateral-torsional buckling and inelastic strengths of the cold-formed steel beams to improved design rules. The model has been verified using available numerical and experimental results and subsequently it has been used to study the behavior and design of cold-formed steel beams subject to lateral–torsional buckling [3]. Kyvelou et al presented a numerical investigation into the degree of composite action that may be mobilized within floor systems comprising cold-formed steel joists and wood-based particle boards [12]. Ungureanu et al to investigates the possibility to use the local plastic mechanisms to characterize the ultimate strength of short thin-walled cold-formed steel members subjected to eccentric compression about the minor axis [16]. It aims to study the behavior of the non and partially composite cold-formed floor beam and to show how connection mechanisms can affect the stiffness, strength, and stability of the cold-formed steel supporting beams
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