ORIGINAL ARTICLE
Modal Analysis of Steel-Concrete Composite Floor in the RFEM 6 Software
1
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, Szczecin, Poland
Submission date: 2025-06-14
Final revision date: 2025-08-20
Acceptance date: 2025-09-09
Online publication date: 2025-09-15
Publication date: 2025-09-15
Corresponding author
Klaudia Pędziwiatr
Department of Theory of Structures, West Pomeranian University of Technology in Szczecin, Faculty of Civil and Environmental Engineering, al. Piastów 17, 70-310, Szczecin, Poland
Department of Theory of Structures, West Pomeranian University of Technology in Szczecin, Faculty of Civil and Environmental Engineering, al. Piastów 17, 70-310, Szczecin, Poland
Civil and Environmental Engineering Reports 2025;35(4):61-80
KEYWORDS
TOPICS
ABSTRACT
Using FEA programs, the structure's modal analysis itself is not complicated. However, in the case of a steel-concrete composite floor, a difficulty arises in the composite behaviour representation. In typical FEA programs, it is not possible to directly insert the composite structure, so the components cooperation has to be represented by substitute methods. In this case, functions such as an orthotropic material, modelling the beams as ribs interacting with the surface (concrete slab) and the use of eccentricities are useful. Besides the modelling methods in RFEM 6, a modal analysis based on the example of a floor is presented. The results are shown and the floor is assessed according to the described guidelines and classification. Based on the fundamental frequency (6.81 Hz), modal mass (58888 kg) and damping (4%), a floor acceptance class C was identified, which is suitable for the assumed office use of the area.
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