Analysis of Dynamic Behavior of Floating Slab Track Using a Nonlinear Viscoelastic Spring Model

Element Analysis(동적유한요소해석), Rubber(고무), Nonlinear(비선형), Viscoelastic(점탄성) Recently, the vibration and structure-borne noise induced by passing trains are of great con-cerns, 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 ex-hibit very good correlation with the test results of a laboratory mock-up test, and the feasibilit