Multi directional hysteretic damper with adaptive post-elastic stiffness for seismic protection of bridges in near fault zones

DİCLELİ M., Milani A. S.

5th International Conference on Bridge Maintenance, Safety and Management (IABMAS), Pennsylvania, United States Of America, 11 - 15 July 2010, pp.3141-3148 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Pennsylvania
  • Country: United States Of America
  • Page Numbers: pp.3141-3148
  • Middle East Technical University Affiliated: Yes


A new hysteretic damper for seismic protection of highway bridges is presented. The Multidirectional 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 (DBE), force levels are close to a regular system while at highest levels of displacements (MCE), the device hardens to make the substructure yield and limit deck's displacement.