This study deals with seismic reliability-based design (SRBD) relationships in terms of behavior factors and displacement demands for softening structures equipped with double friction pendu-lum system (DFPS) bearings. An equivalent 3dof system having a softening post-yield slope is adopted to describe the superstructure behavior, whereas velocity-dependent laws are assumed to model the responses of the two surfaces of the DFPS. The yielding characteristics of the super-structures are defined for increasing behavior factors in compliance with the seismic hazard of L’Aquila site (Italy) and with NTC18 assuming a lifetime of 50 years. Considering several natural seismic records and building properties under the hypothesis of modelling the friction coefficients of the two surfaces of the DFPS as random variables, incremental dynamic analyses are per-formed to evaluate the seismic fragility and the seismic reliability of these systems. Finally, seis-mic reliability-based linear regressions relating the displacement ductility demand and the behav-ior factors for the softening superstructures together with seismic reliability-based design (SRBD) curves for the two surfaces of the double sliding devices are described.

Softening structures isolated by double sliding devices: Seismic reliability-based design approach / Castaldo, Paolo; Alfano, Gaetano. - ELETTRONICO. - 2:(2019), pp. 663-674. (Intervento presentato al convegno XXVII CONGRESSO CTA tenutosi a Bologna nel 3-5 ottobre).

Softening structures isolated by double sliding devices: Seismic reliability-based design approach

Paolo Castaldo;Gaetano Alfano
2019

Abstract

This study deals with seismic reliability-based design (SRBD) relationships in terms of behavior factors and displacement demands for softening structures equipped with double friction pendu-lum system (DFPS) bearings. An equivalent 3dof system having a softening post-yield slope is adopted to describe the superstructure behavior, whereas velocity-dependent laws are assumed to model the responses of the two surfaces of the DFPS. The yielding characteristics of the super-structures are defined for increasing behavior factors in compliance with the seismic hazard of L’Aquila site (Italy) and with NTC18 assuming a lifetime of 50 years. Considering several natural seismic records and building properties under the hypothesis of modelling the friction coefficients of the two surfaces of the DFPS as random variables, incremental dynamic analyses are per-formed to evaluate the seismic fragility and the seismic reliability of these systems. Finally, seis-mic reliability-based linear regressions relating the displacement ductility demand and the behav-ior factors for the softening superstructures together with seismic reliability-based design (SRBD) curves for the two surfaces of the double sliding devices are described.
2019
9788894486605
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2776627
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