Bulletin of Earthquake Engineering

, Volume 3, Issue 3, pp 333–353 | Cite as

Nonlinear Dynamic Response of HDRB and Hybrid HDRB-Friction Sliders Base Isolation Systems

  • Franco Braga
  • Marco Faggella
  • Rosario Gigliotti
  • Michelangelo Laterza
Article

Abstract

The isolation systems are usually made of rubber bearings that are sometimes coupled in hybrid combination with frictional devices; this is the case of an in-site experimental campaign, performed on a base isolated apartment building in Rapolla (south of Italy). Several dropout tests at initial displacements up to 17cm allowed to obtain in-site information on the true dynamic response of the isolation system (building and isolators). The tests carried out allow a comparison between the free vibration responses of a building, isolated by using a 28 HDRB isolation system only, or an HDRB-Friction Sliders Hybrid one. The paper highlights the main differences of the response in the superstructure (the structure over the isolation system) obtained by using only HDRB isolation system, or the Hybrid one (HDRB and Friction Sliders in parallel system). Analysis and comparisons of experimental data, show the influence of nonlinearities on structural higher modes amplification, especially observed by using the higher nonlinear Hybrid isolation system. Tests results confirm that, in the case of a regular superstructure, like the Rapolla building, the isolation system nonlinearities influence the structural response.

Keywords

base isolation free vibrations friction sliders HDRB nonlinearity effects system identification 

Abbreviations

HDRB

high damping rubber bearings

FS

friction sliders

R/C

reinforced concrete

NL

nonlinearity factor

SDOF

single degree of freedom

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Copyright information

© Springer 2005

Authors and Affiliations

  • Franco Braga
    • 1
  • Marco Faggella
    • 2
  • Rosario Gigliotti
    • 2
  • Michelangelo Laterza
    • 2
  1. 1.Structural Engineering DepartmentUniversity “La Sapienza”RomaItaly
  2. 2.Structural Engineering DepartmentUniversity of BasilicataPotenzaItaly

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