In this study, equivalent linear damping and stiffness of a single-degree-of-freedom(SDOF) structure with a rotational friction damper are estimated using the result of experiments and compared with those obtained from non-linear time history analyses. First, the transfer function of the test model is constructed and then the equivalent stiffness and damping are calculated, using the half-power bandwidth (HPB) method. For comparative study, those properties are estimated based on stochastic theory in the time domain. Both equivalent linear systems identified from experiments and numerical analyses correspond well. Further, it is observed that there exists an optimal clamping force on the rotational friction damper from estimated equivalent damping.

• 김형섭(단국대학교 대학원 건축공학과 공학석사) | Kim, Hyoung-Seop
• 박지훈(단국대학교 내진리모델링 연구소 연구교수, 공학박사) | Park, Ji-Hun Corresponding author
• 민경원(단국대학교 건축대학 건축공학과 부교수, 공학박사) | Min, Kyung-Won
• 문병욱(단국대학교 대학원 건축공학과 석사과정) | Moon, Byoung-Wook