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Structural response to non‐stationary multiple‐support random excitation
Author(s) -
Perotti Federico
Publication year - 1990
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290190404
Subject(s) - random vibration , frequency domain , stochastic process , vibration , spectral density , excitation , variance (accounting) , fast fourier transform , ground motion , statistical physics , reliability (semiconductor) , probability density function , mathematics , structural engineering , physics , mathematical analysis , engineering , algorithm , acoustics , statistics , power (physics) , accounting , quantum mechanics , business
The seismic behaviour of large‐size structures subjected to multiple‐support excitation is studied by means of a random vibration approach. Ground motion is modelled as a non‐stationary stochastic process having an evolutionary spectral density. To describe the spatial variability of the input motion a model is adopted which accounts for finite propagation velocity and for loss of correlation as a function of distance and frequency. Structural analysis is entirely performed in the frequency domain and full advantage is taken of FFT properties and capabilities. An example is given regarding the behaviour of a 800 m long viaduct. Results are shown in terms of response evolutionary spectral density, variance and reliability with respect to a fixed threshold.