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Keywords: composite floors, structural dynamics, computational modelling, steel and composite structures, human comfort.

Summary

Structural engineers have long been trying to develop solutions using the full potential of its composing materials. At this point there is no doubt that the structural solution progress is directly related to an increase in materials science knowledge. These efforts in conjunction with up to date modern construction techniques have led to an extensive use of composite floors in large span structures.

A direct consequence of this new design trend is a considerable increase in problems related to unwanted floor vibrations. For this reason, the structural floors systems become vulnerable to excessive vibrations produced by impacts such as human rhythmic activities.

This paper investigated the dynamic behaviour of composite floors (steel-concrete) when subjected to the human rhythmic activities. The dynamic loads were obtained through experimental tests with individuals carrying out rhythmic and non-rhythmic activities such as stimulated and non-stimulated jumping and aerobics [1].

The investigated structural model was based on several building composite floors. The structural systems are composed of a composite (steel/concrete) solution made of an "I" steel profile and a reinforced concrete slab. The proposed analysis methodology adopted the usual mesh refinement techniques present in the finite element method simulations implemented in the ANSYS program [2].

A parametric analysis was developed, using three different building composite floors with two, three and four storeys, respectively. The present investigation was performed keeping the floor spans constant (9m by 10m). The steel columns height was kept equal to 5m to all structural systems. In this work the beam-to-column connections were considered as rigid.

The results indicated that the limits suggested by design recommendations [3,4] were not satisfied, in most of the investigated structural models. Such a fact shows that these rhythmic activities may generate peak accelerations that violated design criteria when the human comfort is considered. It was verified that these dynamic loads generated considerable perturbations on adjacent areas.

References

1: R.G. Faisca, "Caracterização de Cargas Dinâmicas Geradas por Atividades Humanas", PhD Thesis (In Portuguese), COPPE/UFRJ, Rio de Janeiro, RJ, Brazil, 2003.
2: ANSYS, Swanson Analysis Systems, Inc., P.O. Box 65, Johnson Road, Houston, PA, 15342-0065, Version 10.0, Basic analysis procedures, 2nd edition, 2003.
3: T.M. Murray, D.E. Allen, E.E. Ungar, "Floor Vibration Due to Human Activity", Steel Design Guide Series, AISC, Chicago, USA, 1997.
4: International Standard Organization, "Evaluation of Human Exposure to Whole-Body Vibration, Part 2: Human Exposure to Continuous and Shock-Induced Vibrations in Buildings (1 to 80Hz)", International Standard, ISO 2631-2, 1989.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 91 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros Paper 10 Vibration Analysis of Composite Floors Induced by Human Rhythmic Activities N.A. dos S. Langer¹, J.G.S. da Silva², L.R.O. de Lima³, P.C.G. da S. Vellasco³ and L.F. da C. Neves⁴ ¹Civil Engineering Post-graduate Programme (PGECIV), ²Mechanical Engineering Department, ³Structural Engineering Department, State University of Rio de Janeiro (UERJ), Brazil ⁴ISISE, Civil Engineering Department, University of Coimbra, Portugal doi:10.4203/ccp.91.10 purchase the full-text of this paper Full Bibliographic Reference for this paper N.A. dos S. Langer, J.G.S. da Silva, L.R.O. de Lima, P.C.G. da S. Vellasco, L.F. da C. Neves, "Vibration Analysis of Composite Floors Induced by Human Rhythmic Activities", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 10, 2009. doi:10.4203/ccp.91.10 Keywords: composite floors, structural dynamics, computational modelling, steel and composite structures, human comfort. Summary Structural engineers have long been trying to develop solutions using the full potential of its composing materials. At this point there is no doubt that the structural solution progress is directly related to an increase in materials science knowledge. These efforts in conjunction with up to date modern construction techniques have led to an extensive use of composite floors in large span structures. A direct consequence of this new design trend is a considerable increase in problems related to unwanted floor vibrations. For this reason, the structural floors systems become vulnerable to excessive vibrations produced by impacts such as human rhythmic activities. This paper investigated the dynamic behaviour of composite floors (steel-concrete) when subjected to the human rhythmic activities. The dynamic loads were obtained through experimental tests with individuals carrying out rhythmic and non-rhythmic activities such as stimulated and non-stimulated jumping and aerobics [1]. The investigated structural model was based on several building composite floors. The structural systems are composed of a composite (steel/concrete) solution made of an "I" steel profile and a reinforced concrete slab. The proposed analysis methodology adopted the usual mesh refinement techniques present in the finite element method simulations implemented in the ANSYS program [2]. A parametric analysis was developed, using three different building composite floors with two, three and four storeys, respectively. The present investigation was performed keeping the floor spans constant (9m by 10m). The steel columns height was kept equal to 5m to all structural systems. In this work the beam-to-column connections were considered as rigid. The results indicated that the limits suggested by design recommendations [3,4] were not satisfied, in most of the investigated structural models. Such a fact shows that these rhythmic activities may generate peak accelerations that violated design criteria when the human comfort is considered. It was verified that these dynamic loads generated considerable perturbations on adjacent areas. References 1 R.G. Faisca, "Caracterização de Cargas Dinâmicas Geradas por Atividades Humanas", PhD Thesis (In Portuguese), COPPE/UFRJ, Rio de Janeiro, RJ, Brazil, 2003. 2 ANSYS, Swanson Analysis Systems, Inc., P.O. Box 65, Johnson Road, Houston, PA, 15342-0065, Version 10.0, Basic analysis procedures, 2nd edition, 2003. 3 T.M. Murray, D.E. Allen, E.E. Ungar, "Floor Vibration Due to Human Activity", Steel Design Guide Series, AISC, Chicago, USA, 1997. 4 International Standard Organization, "Evaluation of Human Exposure to Whole-Body Vibration, Part 2: Human Exposure to Continuous and Shock-Induced Vibrations in Buildings (1 to 80Hz)", International Standard, ISO 2631-2, 1989. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £140 +P&P)
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