Equivalent Damping Ratio of the Inelastic SDOF Structures with Friction Damper

마찰감쇠기가 설치된 비선형 단자유도 건물의 등가감쇠비

  • 김형섭 (단국대학교 건축대학 건축공학과) ;
  • 민경원 (단국대학교 건축대학 건축공학과) ;
  • 이상현 (서울대학교 공학연구소) ;
  • 박지훈 (단국대학교 건축대학 건축공학과) ;
  • 문병욱 (단국대학교 건축대학 건축공학과)
  • Published : 2004.10.01


The purpose of this paper is to present a design procedure of coulomb friction dampers for controlling elastic and inelastic responses of building structures. The equivalent damping and frequency increased by the friction damper are estimated using ATC-40 and ATC-55 procedures which provide equivalent linear system for bilinear one, and then a design formula to achieve target performance response level by friction damper is presented. It is identified that there exists error between the responses obtained by this formula and by performing nonlinear analysis and the features of the error vary according to the hardening ratio, yield strength ratio, and structural period. Equations for compensating this er개r are reposed based on the least square method, and the results from numerical analyses indicate that the error is significantly reduced, and the proposed formula can be used without much error for designing coulomb friction damper for retrofitting a structure showing elastic or inelastic behavior.