The paper focuses on the effects of the spatial variability of ground motion induced by local site conditions on the seismic response of multi-span viaducts on pile foundations. Analyses are performed accounting for the soil-structure interaction by means of the domain decomposition technique; the kinematic interaction problem is formulated in the frequency domain and lumped parameter models are adopted to reproduce the frequency-dependent behaviour of the soil-foundation system in the non-linear inertial interaction analysis. Effects of the non-synchronous seismic action on the seismic response of a long bridge founded on a soft soil deposit overlying an inclined bedrock are investigated. The seismic action is represented by real accelerograms and site analyses are performed to define the non-synchronous motion induced by local stratigraphic conditions at each pier. Comparisons with results achieved with synchronous seismic motions demonstrate the significance of site effects on the response of long bridges.

Effects of non-synchronous ground motion induced by site conditions on the seismic response of multi-span viaducts

TROPEANO, GIUSEPPE;
2015

Abstract

The paper focuses on the effects of the spatial variability of ground motion induced by local site conditions on the seismic response of multi-span viaducts on pile foundations. Analyses are performed accounting for the soil-structure interaction by means of the domain decomposition technique; the kinematic interaction problem is formulated in the frequency domain and lumped parameter models are adopted to reproduce the frequency-dependent behaviour of the soil-foundation system in the non-linear inertial interaction analysis. Effects of the non-synchronous seismic action on the seismic response of a long bridge founded on a soft soil deposit overlying an inclined bedrock are investigated. The seismic action is represented by real accelerograms and site analyses are performed to define the non-synchronous motion induced by local stratigraphic conditions at each pier. Comparisons with results achieved with synchronous seismic motions demonstrate the significance of site effects on the response of long bridges.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/115747
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