International Journal of Steel Structures

, Volume 17, Issue 2, pp 515–524 | Cite as

TADAS dampers in very large deformations

  • Reza Karami MohammadiEmail author
  • Arman Nasri
  • Azin Ghaffary


Triangular-plate Added Damping and Stiffness (TADAS) dampers are special kinds of passive control devices that can be used in seismic design and retrofitting of structural systems. However, when exposed to large deformations, primary members of a structure can be in danger of serious damage due to improper geometric characteristics of these dampers. In this study, response of a one bay frame equipped with a TADAS device, previously tested in the laboratory, was simulated using a detailed FE model in ABAQUS. A monotonic analysis was then conducted on the TADAS damper alone, which indicated that in large deformations, TADAS damper pins hit the top of the holes, resulting in an abrupt stiffness increase in the damper. Seismic analysis of a six story moment resisting frame with TADAS dampers, using a series of twelve scaled earthquake ground motions, was also conducted in OpenSees which indicated that with sudden stiffness increase in dampers, the value of moments in beams as well as axial forces in braces will increase, causing possible damages in these areas. At the end, a method for calculating the optimal height for the holes in the damper was proposed, which is shown to be in good agreement with detailed ABAQUS models.


TADAS damper large deformations test simulation improper geometric characteristic structural damage 


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Copyright information

© Korean Society of Steel Construction and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Reza Karami Mohammadi
    • 1
    Email author
  • Arman Nasri
    • 1
  • Azin Ghaffary
    • 1
  1. 1.Civil Engineering DepartmentK.N.Toosi University of TechnologyTehranIran

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