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우성식,이상현,최기영,정란,박태원,Woo, Sung-Sik,Lee, Sang-Hyun,Choi, Ki-Young,Chung, Lan,Park, Tae-Won 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.2
In this study, it was investigated for dynamic nonlinear characteristics using dynamic data obtained by shaking table test. The design of Tuned Liquid Damper(TLD) has limitation to plan based on Tuned Mass Damper(TMD) analogy and linear wave theory. Also, while there are many studies regarding properties of TLD under harmonic load, there are not estimated for dynamic non-linear characteristics of TLD under the load that is not governed by particular frequency like a white noise. This paper investigated dynamic non-linear characteristics of TLD varied with load amplitude using a white noise and suggested equations that can estimate damping ratio, natural frequency ratio and effective mass ratio of TLD. 본 연구에서는 진동대 실험을 통해 얻은 동적 데이터를 이용하여 TDL의 동적 비선형 특성에 대한 연구를 수행하였다. 현재까지 TDL의 설계는 액체의 비선형 거동이 나타남에도 불구하고 TMD 근사이론이나 선형파동이론과 같은 선형 거동을 가정으로 설계되어 지는 한계를 가지고 있다. 또한 조화하중과 같은 특정진동수에 지배되는 하중형태에 대한 TDL의 동적 비선형 특성이 규명되었지만 백색잡음과 같은 특정진동수 성분에 지배되지 않은 하중형태에 대한 TDL의 동적 비선형 특성은 아직까지 검증된 바가 없다. 본 논문은 백색잡음을 이용하여 가진 하중 크기에 따른 TDL의 동적 비선형 특성을 검토하여 설계 시 필요한 동조액체감쇠기의 감쇠비, 고유진동수비 및 유효질량비를 평가할 수 있는 산정식을 제안하였다.
상용 구조해석 프로그램을 이용한 TMD가 설치된 RC 공동주택 구조물에 대한 모델링 및 수치해석
우성식(Woo Sung-Sik),이상현(Lee Sang-Hyun),정란(Chung Lan),이정우(Lee Joung-Woo),조승호(Cho Seung-Ho) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In this paper, a numerical model of a reinforced concrete apartment structure with TMD is constructed using commercial structural analysis program MIDAS and seismic response analysis is performed. The design parameters of TMD such as tuned frequency ratio and damping ratio are determined based on the equation proposed by Sadek(1998) and time history analysis is conducted for a standard model of wall type apartment structure which is not seismically designed. Seven artificial earthquake loads are generated according to the KBC2005 seismic load design spectrum for Sc soil condition, and the responses of the structure without/with TMD are averaged over the 7 earthquake loads. Numerical analysis results show that TMD can provide 20~28% reduction of relative displacement, inter-story drift, and story shear force.
우성식 ( Woo Sung-sik ),김현진 ( Kim Hyeon-jin ),이상현 ( Lee Sang-hyun ),정란 ( Chung Lan ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
The seismic performance improvement of the slab damper-shear wall system which is newly proposed in this study was experimentally verified by conducting shaking table tests. White noise, harmonic and earthquake acceleration are used as input signal and the acceleration responses of the two story building structures with/without the slab dampers were measured and compared in time and frequency domains. The experimental results indicate that the slab damper system can effectively control the seismic response. The proposed system can be used in the connection of the existing structure and the new horizontal extension.
우성식(Woo, Sung-Sik),이상현(Lee, Sang-Hyun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.6
The vertical extension of a building in general remodeling process increases both gravity and seismic loads by simply adding masses to the building. In this study, a vertical extension structural module(VESM) is proposed for enhancing seismic performance of the existing buildings by utilizing the story-increased parts. The proposed VESM is composed of steel column, steel beam, and beam-end rotational damper. The steel columns are connected to the shear walls and transfer the wall rotation in out-of plane to the steel beam, and then the beam-end rotational damper dissipates the earthquake-induced energy. Numerical analysis result from a cantilever beam of which end-rotation is restricted by rotational damper indicates that the displacement, base shear, and base overturning moment of the existing structures showing cantilever behavior can be significantly reduced by using the proposed method. Also, it is observed that friction-type rotational damper is effective than viscous one.