engleski

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

To provide the foundations for economic and social prosperity, countries all over the world 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. Corrugated web beams represent a relatively new structural element that has emerged in the past two decades and was developed for various applications, i.e. the main beams in single-storey steel frame buildings, secondary beams of multi-storey buildings, etc. Due to the thin webs, from 1.5 mm to 3 mm, corrugated web beams, compared to hot-rolled profiles or welded I-sections, allow significant weight reduction. The main benefit of this type of beams is that the corrugated web increases the beam’s stability against local and lateral- torsional buckling and against web crippling, which may result in a more effective design from both technical and economic point of view. Within the paper, the planned activities of the LWT-FLOOR research project funded by the Croatian Science Foundation will be presented. To investigate and validate components and the proposed system, extensive experimental, numerical and probabilistic research will be conducted. Within the investigation, a particular focus will be given to spot-welding connections and innovative types of shear connections with the possibility of design for dismantling and the potential for re- use or recycling at the end of design life through the application of lifecycle analyses. Calibrated and validated numerical models based on experimental tests of the entire system and its components will, through probabilistic methods, evaluate the system suitability for larger spans and establish the analytical proposal for design recommendations.

Spot welding ; Composite floor system ; Shear connection ; Built-up

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