Innovative Lightweight Cold-Formed Steel-Concrete Composite Floor System – LWT-FLOOR project

Abstract

To provide the foundations for economic and social prosperity, countries worldwide need to be making a term investment in their building assets. However, there is a lack of a systematic approach, such as manufacturing innovations, to maximize the values of building components and materials in its entire lifecycle. Steel-concrete composite floor systems are one of the most cost-effective construction systems for multi-storey steel buildings because they combine structural efficiency with the speed of construction. These advantages depend on the efficiency of combining steel and concrete structural elements to avoid their inherent disadvantages. This paper presents a solution that integrates state-of-the-art knowledge in new, fast and productive spot-welding technology and innovative cold-formed steel-concrete composite solutions. The solution proposes a new construction method as a combination of built- up cold-formed steel members and cast-in-place concrete slab. The proposed floor system offers key benefits in terms of a high degree of prefabrication, reusability and long spanning capability.

Parametric Finite Element Analyses of Demountable Shear Connection in Cold-Formed Steel–Concrete Composite Beams

“…Spot-welded beams have a higher stiffness and load-bearing capacity compared to beams with self-drilling screws [6,7]. However, besides its satisfactory behaviour, spot welding also allows the standardisation of design and fabrication details and production process automation, which can ultimately lead to the faster fabrication of the designed CWB [8].…”

Parametric Finite Element Analyses of Lightweight Cold‐formed Steel‐concrete Composite Floor Beams

“…Models also consist of shear plates made of steel sheets with a thickness of 1.0 mm and various heights (400 mm, 500 mm, 600 mm), the corrugated web with various thicknesses (0.8 mm, 1.0 mm, 1.5 mm) and heights (400 mm, 500 mm, 600 mm) and metal sheets that serve as formwork for a concrete slab with an overall thickness of 120 mm and effective width of 1500 mm made of concrete class C25/30, see Figure 1. For steel parts of the model, 4-node doubly curved thin or thick shell, reduced integration (S4R) elements were used, and for concrete slab, an 8-node linear brick, reduced integration (C3D8R) [4,26,31,34]. The used approximate mesh size for steel C120 sections was 10 mm, shear plates and corrugated web 15 mm, metal sheets 20 mm, and concrete deck 30 mm.…”

Numerical study of shear connection in cold-formed steel-concrete composite beam

“…vijcima, točkastim zavarima i tehnikom hladnog prijenosa metala, koji su istraženi u [8][9][10], utvrđeno je da povezivanje točkastim zavarivanjem ima najpovoljniju otpornost [11]. Ovako sastavljeni HOP nosači s valovitim hrptom, koristeći točkasto zavarivanje, rezultiraju odličnom duktilnošću i nosivosti, pri čemu također, točkasto zavareni nosači pokazuju veću krutost i nosivost u odnosu na nosače kod kojih se koriste samobušeći vijci [12,13]. Drugi važan razlog primjene tehnike točkastog zavarivanja je da takvo rješenje omogućuje standardizaciju detalja u projektiranju i izvedbi, dozvoljava automatizaciju procesa proizvodnje što zauzvrat može povećati brzinu izrade sastavljenih HOP elemenata s valovitim hrptovima [6].…”