In this paper the effects of soil-structure interaction on the dynamic response of isolated overcrossings are investigated with reference to a case study, constituted by a real highway bridge. An accurate geotechnical characterization of the site is available from which the dynamic and mechanical properties of the soil are obtained. The seismic input is defined at the outcropping bedrock by means of real accelerograms and local response analyses are performed to compute the free-field input motions accounting for the non linear soil behaviour. The soil-structure interaction effects are evaluated on isolated and non-isolated bridges by comparing the seismic response of the structure with that obtained from a conventional fixed base model. Results demonstrate that the non-isolated bridge is more sensitive to soil-structure interaction effects, particularly in the transverse direction, where the pier stiffness is very high. Nevertheless, on the isolated bridge, soil-structure interaction produces an increase of the total shear strain in the isolators that should be taken in account in the verifications.

Site effects and soil-structure interaction on an isolated highway overcrossing on pile foundations / Tombari, A.; Dezi, F.; Carbonari, Sandro; Leoni, G.. - Paper No. SSITO:(2011). (Intervento presentato al convegno 5th International Conference on Earthquake Geotechnical Engineering, 5ICEGE tenutosi a Santiago, Chile nel 10-13 January, 2011).

Site effects and soil-structure interaction on an isolated highway overcrossing on pile foundations

CARBONARI, SANDRO;
2011-01-01

Abstract

In this paper the effects of soil-structure interaction on the dynamic response of isolated overcrossings are investigated with reference to a case study, constituted by a real highway bridge. An accurate geotechnical characterization of the site is available from which the dynamic and mechanical properties of the soil are obtained. The seismic input is defined at the outcropping bedrock by means of real accelerograms and local response analyses are performed to compute the free-field input motions accounting for the non linear soil behaviour. The soil-structure interaction effects are evaluated on isolated and non-isolated bridges by comparing the seismic response of the structure with that obtained from a conventional fixed base model. Results demonstrate that the non-isolated bridge is more sensitive to soil-structure interaction effects, particularly in the transverse direction, where the pier stiffness is very high. Nevertheless, on the isolated bridge, soil-structure interaction produces an increase of the total shear strain in the isolators that should be taken in account in the verifications.
2011
9789567141180
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/85348
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