An innovative hysteretic damper with adaptive post-elastic stiffness for seismic protection of bridges

DİCLELİ M., Milani A. S.

BRIDGE STRUCTURES, vol.11, no.4, pp.131-140, 2015 (ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 4
  • Publication Date: 2015
  • Doi Number: 10.3233/brs-140074
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Page Numbers: pp.131-140
  • Keywords: Hysteretic damper, design, basis earthquake, maximum considered earthquake, seismic isolated bridges
  • Middle East Technical University Affiliated: Yes


A new hysteretic damper for seismic protection of highway bridges is presented. The Multi-directional Torsional Hysteretic Damper (MTHD) works based on torsional yielding of steel cylindrical cores. The device demonstrates a hyperbolic post-elastic stiffness as a result of its special working mechanism which produces this geometric hardening effect. The post-elastic stiffness was found to be effective in limiting the lateral displacement of the seismic-isolated bridge decks in near-fault. Results of nonlinear time history analyses revealed the adaptive behavior of the device which is a result of this gradual hardening feature, such that at lower displacements in Design-Basis Earthquake (DBE), force levels are close to a regular system while at highest levels of displacements in Maximum Considered Earthquake (MCE), the device hardens to make the substructure yield and limit deck's displacement.