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Structural response to non-stationary multiple-support random excitation

โœ Scribed by Federico Perotti

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
931 KB
Volume
19
Category
Article
ISSN
0098-8847

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โœฆ Synopsis

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.

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