University of Cambridge > > Engineering Department Structures Research Seminars > Probabilistic assessment of low frequency floors due to human locomotion

Probabilistic assessment of low frequency floors due to human locomotion

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If you have a question about this talk, please contact Dr Maria Marques de Carvalho.

Low frequency floors are those in which the predominate response is a resonant one Modelling of a structure has historically and traditionally been based on a deterministic process In such procedures walking is modelled through a Fourier series in the time domain and is assumed to be perfectly harmonic However research has shown this to be incorrect and walking is in fact a narrowband process with energy leakage through each harmonic Deterministic methods select a walking frequency that matches a harmonic of walking with a resonant frequency of the structure with no consideration for the uncertainty in the model and likelihood of such events occurring The PhD research conducted therefore addresses this problem through a probabilistic framework that further considers factors traditionally outside the scope of design codes such as human structure interactions and selection of appropriate damping Damp ing predictions in structures pre construction is a difficult task Damping of structural systems such as office spaces gain most of their damping through radiational dissipation of energy to non structural elements such as false floors, partitions and furniture Current guidelines suggest a range of values of damping, however testing has shown that these predictions are often conservative and wrong A predictive procedure is put forward to address the current shortcomings with the aid of various machine learning techniques

This talk is part of the Engineering Department Structures Research Seminars series.

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