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장승엽(Jang Seung Yup),양신추(Yang Sin-Chu),김정일(Kim Jeong Il),김태욱(Kim Tae Wook) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Precast concrete slab track has been already turned out to be more efficient than cast-in place concrete slab track in view of the easiness of construction and the quality control of concrete. Thus, there is a great need to bring in the precast slab track system. In order to develop the realistic precast slab track system that is well conformed to our circumstances, the performance criteria of slab track, and the state-of-the art of precast slab track systems that are used in other countries are briefly discussed here.
비선형 점탄성 스프링 모델을 이용한 플로팅 슬래브 궤도의 동적 거동 해석
장승엽(Jang, Seung Yup),박진철(Park, Jin Chul),황성호(Hwang, Sung Ho),김은(Kim, Eun) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.11
Recently, the vibration and structure-borne noise induced by passing trains are of great concerns, and the floating slab track is highlighted as one of most efficient alternatives to reduce the railway vibration. However, due to the non-linearity and viscosity of rubber spring used in the floating slab track, its dynamic behavior is very complex. In this study, therefore, to simulate the dynamic behavior of floating slab track with a better accuracy, a nonlinear viscoelastic rubber spring model that can be incorporated in commercial finite element analysis codes has been proposed. This model is composed of a combination of elastic spring element, friction element and viscous element, and termed the 'generalized friction viscoelastic model(GFVM)'. Also, in this study, the method to determine the model parameters of GFVM based on Berg's 5-parameter model was presented. The results of the finite element analysis with this rubber spring model exhibit very good correlation with the test results of a laboratory mock-up test, and the feasibility of GFVM has been verified.