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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Dynamic Analysis of Composite Floors Subject to Human Rhythmic Activities
J.K. Loose1, W.G. Ferreira1 and J.G.S. da Silva2
1Civil Engineering Department, Federal University of Espirito Santo, Brazil
J.K. Loose, W.G. Ferreira, J.G.S. da Silva, "Dynamic Analysis of Composite Floors Subject to Human Rhythmic Activities", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 25, 2007. doi:10.4203/ccp.86.25
Keywords: composite floors, structural dynamics, computational modelling, steel and composite structures, human comfort.
The need for a rhythmic excitation design criterion has arisen from the increasing incidence of building vibration problems due to rhythmic activities. This was the main motivation for the development of a design methodology based on the structural system dynamic response submitted to dynamic loads due to human activities.
This paper investigated the dynamic behaviour of composite floors (steel-concrete) when subjected to the rhythmic activities corresponding to aerobic gymnastics and free jumps. 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 aerobic gymnastics .
The proposed analysis methodology adopted the usual mesh refinement techniques present in the finite element method. Based on the experimental results, human load functions resulting from rhythmic and non-rhythmic activities are proposed. The structural model investigated was based on several floors, with main spans varying from 5m to 10m. 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 .
A parametric analysis was performed varying the composite floor span from 5m to 10m. The steel columns height was kept equal to 5m for all floors. The incorporation of the columns in the computational model was made in order to obtain a more realistic simulation of the beam-column joint. The parametric study considered correlations between analytical and numerical results found in the technical literature . The results, in terms of maximum accelerations, are compared with the limits proposed by design recommendations, from the point of view of human comfort [3,4].
The results indicated that the limits suggested by design recommendations [3,4] were not satisfied, in most of the investigated composite floors. It was shown that these rhythmic activities may generate peak accelerations that violated design criteria when human comfort is considered. It was verified that these dynamic loads generated considerable perturbations on an adjacent floor. The influence caused by dynamic actions in adjacent floors near where the load was applied also can compromise the human comfort.
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