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Numerical methods to predict human induced vibrations on low frequency stairs. Part 2: evaluation by comparing with experimental data
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Advisor(s)
Abstract(s)
Nowadays, vibration serviceability criteria are becoming the governing factor in the design of most modern
staircases, because their increasing susceptibility to human induced vibrations. Although more awareness have
been raised to the dynamic design of new staircases, there are still few studies found in the literature that
compare the different results of numerical methods for predicting vibrations with experimental data, in order to
validate the same.
Hence, this paper employs the main existing numerical methods to an actual staircase with known liveness, by
comparing the predicted results with the experimental data, to evaluate their accuracy when designing flexible
staircases. This paper is Part 2 of a set of two papers. In Part 1, the different numerical methods are presented and
details are given of how to apply them.
To accomplish this, an in-situ staircase dynamic characterisation and several walking tests are performed. The
measured vibrations are initially compared with different proposed acceptable limits to confirm that the vi brations exceed the limits. The different numerical methods are then employed and the predicted results are
compared with the experimental results. Lastly, the main findings of this work are discussed together with those
of diverse researchers who also applied one of these procedures to estimate vibrations.
The results obtained showed that, with two of the numerical procedures applied (footfall force time histories
and simplified vibration evaluation), it was possible to effectively predict the vibrations, while with the
remaining two (Fourier series walking models and steady-state analysis), in general, overestimated responses
were predicted.
Description
Keywords
Ground reaction forces Fourier series Steady-state analysis Simplified vibration evaluation Vibration acceptable limits Experimental program . Faculdade de Ciências Exatas e da Engenharia
Citation
Andrade, P., Santos, J., & Escórcio, P. (2021, December). Numerical methods to predict human induced vibrations on low frequency stairs. Part 2: Evaluation by comparing with experimental data. In Structures (Vol. 34, pp. 1008-1020). Elsevier. https://doi.org/10.1016/j.istruc.2021.08.024
Publisher
Elsevier