This study aims to estimate the optimal properties of friction pendulum devices to seismically iso-late elastic structural systems under earthquake excitations having different characteristics in terms of frequency content. A two-degree-of-freedom model is considered to describe the isolated system behavior with a velocity-dependent model for the isolators. Specifically, a non-dimensional formulation of the governing equations of motion is presented in order to relate the characteristic parameters describing the isolator and structure properties to the response parame-ters of interest for the performance assessment. Several seismic artificial excitations, having fre-quency contents properly defined to describe respectively stiff, medium and soft soil conditions, are assumed. Finally, the optimum values of the friction coefficient that minimize the superstruc-ture displacements relative to the base mass as a function of the structural system properties, of the seismic input intensity and of the soil condition are computed.

SEISMIC PERFORMANCE OF BASE-ISOLATED STEEL STRUCTURES FOR DIFFERENT SOIL CONDITIONS / Castaldo, Paolo; Ripani, Marianela; Folino, Paula. - STAMPA. - 1:(2017), pp. 345-356. (Intervento presentato al convegno Le Giornate Italiane della Costruzione in Acciaio - The Italian Steel Days tenutosi a Venezia nel 28-30 settembre 2017).

SEISMIC PERFORMANCE OF BASE-ISOLATED STEEL STRUCTURES FOR DIFFERENT SOIL CONDITIONS

Castaldo, Paolo;
2017

Abstract

This study aims to estimate the optimal properties of friction pendulum devices to seismically iso-late elastic structural systems under earthquake excitations having different characteristics in terms of frequency content. A two-degree-of-freedom model is considered to describe the isolated system behavior with a velocity-dependent model for the isolators. Specifically, a non-dimensional formulation of the governing equations of motion is presented in order to relate the characteristic parameters describing the isolator and structure properties to the response parame-ters of interest for the performance assessment. Several seismic artificial excitations, having fre-quency contents properly defined to describe respectively stiff, medium and soft soil conditions, are assumed. Finally, the optimum values of the friction coefficient that minimize the superstruc-ture displacements relative to the base mass as a function of the structural system properties, of the seismic input intensity and of the soil condition are computed.
2017
9788885522008
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2683529
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