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Article
Affiliation(s)

1. State University of Rio de Janeiro (UERJ), Rio de Janeiro/RJ 20550-900, Brazil
2. Structural Engineering Department (ESTR), State University of Rio de Janeiro (UERJ), Rio de Janeiro/RJ 20550-900, Brazil

ABSTRACT

Floors subjected to mechanical equipment loads frequently present problems associated with excessive vibration which can cause human discomfort or even reduce the structure service life. In this context, this work aims to develop an analysis methodology in order to assess the fatigue performance of steel-concrete composite floors, when subjected to vibrations induced by mechanical equipment. The studied structural model corresponds to a steel-concrete composite floor spanning 10 m by 10 m, with a total area of 100 m2. The numerical model developed for the dynamic analysis adopted the usual mesh refinement techniques present in finite element method (FEM) simulations implemented in the ANSYS program. The investigated floor dynamic response was calculated through the consideration of the dynamic loadings imposed by the mechanical equipment, simulated based on the use of harmonic forces applied on the concrete slabs. Furthermore, the dynamic structural response was performed considering several scenarios for the positioning of the equipment, in order to verify the occurrence of excessive vibration. The fatigue assessment is based on a linear cumulative damage rule through the use of the Rainflow-counting algorithm and S-N curves from traditional design codes. The results of this investigation indicated that the equipment position affects directly the floor dynamic structural response and also significantly influences the structure service life.

KEYWORDS

Steel-concrete composite floors, mechanical equipment, dynamic structural analysis, fatigue assessment.

Cite this paper

References

[1]       Aguiar, J. V. et al. 2021. “Assessment of the Human Comfort of Floors Based on the Use of Biodynamic Models.” Presented at 42nd Ibero-Latin-American Congress on Computational Methods in Engineering (XLII CILAMCE), Rio de Janeiro/RJ, Brazil.

[2]       EUROCODE 3. 2003. Design of Steel Structures—Part 1-9: Fatigue. European Committee for Standardisation.

[3]       AASHTO. 2012. LRFD Bridge Design Specifications. American Association of State Highway and Transportation Officials (AASHTO).

[4]       NBR 8800. 2008. Design of Steel Structures and Steel-Concrete Composite Structures for Buildings. Brazilian Technical Standards Association. (in Portuguese)

[5]       Carrier. 2017. Technical Catalogue AQUAFORCE®. 30XW150-400. (in Portuguese)

[6]       ANSYS. 2010. Swanson Analysis Systems, Inc., P.O. Box 65, Johnson Road, Houston, PA, 15342-0065. Products ANSYS Academic Research.

[7]       Murray, T. M., et al. 2016. Vibrations of Steel-Framed Structural Systems Due to Human Activity. Chicago: American Institute of Steel Construction (AISC).

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