Abstract
In recent years, vibration in structures is becoming an increased concern due to the adoption of slender flooring systems (i.e. lighter, thinner and longer floors). Vibrations induced by footfall are more significant in slender floors and should therefore be taken into consideration in the serviceability of the reinforced concrete structures. Limited research exists in the literature focusing on dynamic analysis of flat plate slabs subjected to footfall induced vibration. Hence, this study attempts to breach this research gap by exploring a wider area through conducting a parametric investigation on the effect of floor span, floor aspect ratio, slab thickness and location of openings on the dynamic response of flat plate slabs. Structures are initially designed in accordance with Eurocode 2. Models are generated and analysed using the finite element method and dynamic responses from the footfall analysis are obtained. It was found that vertical displacement increases exponentially with the increase of floor width, aspect ratio and number of openings. However, the displacement decreases with the increase of slab thickness. Moreover, the location of openings is found to have significant effect on the responses of flat plate slabs.
Highlights
Vibration has become an important aspect in structural design, as the weight of modern structures are becoming lighter due to the adoption of slender flooring systems These type of slender flooring systems have different natural frequencies which probably coincide with the footfall induced vibration frequencies resulting in resonance
The method comprises of multiple degree of freedom (MDOF) vibration parameter estimation using measured Frequency Response Function (FRF) and Finite Element (FE) modelling prior to the full-scale testing
This paper presents the dynamic responses of reinforced concrete flat plate slabs subjected to footfall induced vibration
Summary
Vibration has become an important aspect in structural design, as the weight of modern structures are becoming lighter due to the adoption of slender flooring systems These type of slender flooring systems have different natural frequencies which probably coincide with the footfall induced vibration frequencies resulting in resonance. This general shape of walking force-time history was confirmed by Galbraith and Barton [2], Blanchard et al [3], Ohlsson [4] and Kerr [5] through experimental works It was, found that the step length and peak force magnitude increase with the walking speed. Human-induced excitation is related to different modes of human moving It was concluded by Wheeler [7] that the peak amplitude, stride length and velocity increased with step frequency while the contact time decreases. There are many mode shapes when the floor structure is vibrating freely with its individual natural frequency [14]. This paper presents the dynamic responses of reinforced concrete flat plate slabs subjected to footfall induced vibration. Dynamic responses obtained from the dynamic footfall analysis are expressed in terms of vertical displacements and accelerations
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