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The paper deals with the seismic reliability of base-isolated structural systems equipped with friction pendulum isolators (FPS) in order to provide useful design recommen-dations. A two-degree-of-freedom model is adopted by accounting for the superstructure flex-ibility, whereas the FPS isolator behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The spectral dis-placement corresponding to the isolated period has been chosen as intensity measure (IM). The uncertainty in the seismic inputs as well as the friction coefficient at large velocity are considered as random variables modeled through appropriate probability density functions. Monte Carlo simulations are developed in order to evaluate the probabilities exceeding dif-ferent limit states related to both superstructure and isolation level defining the seismic fra-gility curves. Finally, considering the seismic hazard curve related to an Italian site, closed-form expressions are derived with the aim to design the radius in plan of the friction pendu-lum isolators in function of the expected reliability level.

The paper deals with the seismic reliability of base-isolated structural systems equipped with friction pendulum isolators (FPS) in order to provide useful design recommendations. A two-degree-of-freedom model is adopted by accounting for the superstructure flexibility, whereas the FPS isolator behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The spectral displacement corresponding to the isolated period has been chosen as intensity measure (IM). The uncertainty in the seismic inputs as well as the friction coefficient at large velocity are considered as random variables modeled through appropriate probability density functions. Monte Carlo simulations are developed in order to evaluate the probabilities exceeding different limit states related to both superstructure and isolation level defining the seismic fragility curves. Finally, considering the seismic hazard curve related to an Italian site, closedform expressions are derived with the aim to design the radius in plan of the friction pendulum isolators in function of the expected reliability level.

SEISMIC RELIABILITY-BASED DESIGN OF STRUCTURES ISOLATED BY FPS / Castaldo, Paolo; Amendola, Guglielmo; Palazzo, Bruno. - ELETTRONICO. - 4:(2016), pp. 8431-8444. (Intervento presentato al convegno ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering tenutosi a Crete Island, Greece nel 5–10 June 2016).

SEISMIC RELIABILITY-BASED DESIGN OF STRUCTURES ISOLATED BY FPS

CASTALDO, PAOLO;
2016

Abstract

The paper deals with the seismic reliability of base-isolated structural systems equipped with friction pendulum isolators (FPS) in order to provide useful design recommendations. A two-degree-of-freedom model is adopted by accounting for the superstructure flexibility, whereas the FPS isolator behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The spectral displacement corresponding to the isolated period has been chosen as intensity measure (IM). The uncertainty in the seismic inputs as well as the friction coefficient at large velocity are considered as random variables modeled through appropriate probability density functions. Monte Carlo simulations are developed in order to evaluate the probabilities exceeding different limit states related to both superstructure and isolation level defining the seismic fragility curves. Finally, considering the seismic hazard curve related to an Italian site, closedform expressions are derived with the aim to design the radius in plan of the friction pendulum isolators in function of the expected reliability level.
2016
The paper deals with the seismic reliability of base-isolated structural systems equipped with friction pendulum isolators (FPS) in order to provide useful design recommen-dations. A two-degree-of-freedom model is adopted by accounting for the superstructure flex-ibility, whereas the FPS isolator behaviour is described by adopting a widespread model which considers the variation of the friction coefficient with the velocity. The spectral dis-placement corresponding to the isolated period has been chosen as intensity measure (IM). The uncertainty in the seismic inputs as well as the friction coefficient at large velocity are considered as random variables modeled through appropriate probability density functions. Monte Carlo simulations are developed in order to evaluate the probabilities exceeding dif-ferent limit states related to both superstructure and isolation level defining the seismic fra-gility curves. Finally, considering the seismic hazard curve related to an Italian site, closed-form expressions are derived with the aim to design the radius in plan of the friction pendu-lum isolators in function of the expected reliability level.
978-618828440-1
4.1 Contributo in Atti di convegno
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2664994
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