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Title |
A Dynamic Analysis of PSC Box Bridge Varying Span Lengths for Increased Speeds of KTX
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Keywords |
38자유도 ; 동적응답 ; 고속철차량 ; PSC박스교 ; Runge-Kutta기법 ; 38-degree of freedom ; Dynamic responses ; High-speed reilway vehicle ; PSC box bridges ; Runge-Kutta method |
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Abstract |
A dynamic analysis procedure is developed to provide a better estimation of the dynamic responses of bridge during the passage of high speed railway vehicles. Particularly, a three dimensional numerical model including the structural interaction between high speed vehicles, bridges and railway endures to analyse accurately and evaluate with in-depth parametric studies for dynamic responses of various bridge span lengths running KTX railway locomotive up to increasing maximum speed(450km/h). Three dimensional frame element is used to model the simply supported pre-stressed concrete (PSC) box bridges for four span lengths(40~25m). Track irregularity employed as a stationary random process from the given spectral density functions and irregularities of both sides of the track are assumed to have high correlation. The high-speed railway vehicle (KTX) is used as 38-degree of freedom system. Three displacements (Vertical, lateral, and longitudinal) as well as three rotational components (Pitching, rolling, and yawing) are considered in the 38-degree of freedom model. The dynamic amplification factors are evaluated by the developed procedure under various traveling conditions, such as track irregularity camber, train speed and ballast. The dynamic analysis such as Newmark-β and Runge-Kutta methods which are able to analyse considering the dynamic impact factors are compared and contrasted.
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