The paper deals with the seismic reliability of steel structural systems equipped with friction pen-dulum isolators (FPS). The behavior of these systems is analysed by employing a two-degree-of-freedom model accounting for the superstructure flexibility, whereas the FPS device behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The uncertainty in the seismic inputs is taken into account by considering a set of artificial records, obtained through the power spectral density method as well as the friction coefficient at large velocity is considered as random variable modelled through a uniform prob-ability density function. Incremental dynamic analysis are developed in order to evaluate the fra-gility curves related to both superstructure and isolation level for different structural system prop-erties. Finally, considering the seismic hazard curve related to a site near L’Aquila (Italy), the seismic reliability of the overall system is evaluated providing reliability-based abacuses useful to design the radius in plan of the friction pendulum devices.
SEISMIC RELIABILITY OF STEEL STRUCTURAL SYSTEMS ISOLATED BY FPS / Palazzo, Bruno; Castaldo, Paolo; Amendola, Guglielmo. - STAMPA. - 2:(2015), pp. 653-662. (Intervento presentato al convegno XXV Congresso CTA tenutosi a Salerno nel 1-3 ottobre 2015).
SEISMIC RELIABILITY OF STEEL STRUCTURAL SYSTEMS ISOLATED BY FPS
CASTALDO, PAOLO;
2015
Abstract
The paper deals with the seismic reliability of steel structural systems equipped with friction pen-dulum isolators (FPS). The behavior of these systems is analysed by employing a two-degree-of-freedom model accounting for the superstructure flexibility, whereas the FPS device behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The uncertainty in the seismic inputs is taken into account by considering a set of artificial records, obtained through the power spectral density method as well as the friction coefficient at large velocity is considered as random variable modelled through a uniform prob-ability density function. Incremental dynamic analysis are developed in order to evaluate the fra-gility curves related to both superstructure and isolation level for different structural system prop-erties. Finally, considering the seismic hazard curve related to a site near L’Aquila (Italy), the seismic reliability of the overall system is evaluated providing reliability-based abacuses useful to design the radius in plan of the friction pendulum devices.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2664997
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