A critical assessment of the design displacements of friction pendulum systems

Date

2024-02-01

Author

Alıcı, F. Soner
Sucuoğlu, Haluk
Özçamur, Uğurcan

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The equivalent linear static procedure suggested in seismic codes for determining the maximum displacements of seismic isolation systems is evaluated comprehensively for friction pendulum isolators with respect to the benchmark nonlinear response history analysis procedure for a set of radii of curvature and coefficients of friction. A large set of selected and scaled near field ground motions recorded on stiff and soft soils are employed in comparative evaluations. It has been observed that equivalent linear static procedure significantly overestimates the maximum isolator displacements for all practical combinations of radius of curvature and friction coefficient. Overestimation is larger for ground motions on soft soils. Alternatively, a practical description of inelastic displacement spectra is introduced where the hazard is defined in terms of the 1-second spectral acceleration accounting for the seismicity and soil class of the site, and friction pendulum isolation systems are characterized by their radius of curvature and nominal friction coefficient. Employing the proposed design spectra in design and production may lead to significant reductions of the isolator sizes. Moreover, realistic estimation of maximum isolator displacements also leads to realistic estimation of isolator stiffness, as well as the internal design forces of both the isolation system and the superstructure through response spectrum analysis under design spectrum.

Subject Keywords

Design displacement, Equivalent linear static procedure, Friction pendulum systems, Inelastic displacement spectra, Mean inelastic displacements, Seismic isolation

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85181671153&origin=inward
https://hdl.handle.net/11511/108126

Journal

Soil Dynamics and Earthquake Engineering

DOI

https://doi.org/10.1016/j.soildyn.2023.108426

Collections

Department of Civil Engineering, Article

Citation Formats

F. S. Alıcı, H. Sucuoğlu, and U. Özçamur, “A critical assessment of the design displacements of friction pendulum systems,” Soil Dynamics and Earthquake Engineering, vol. 177, pp. 0–0, 2024, Accessed: 00, 2024. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85181671153&origin=inward.