EVALUATION OF THE DYNAMIC AMPLIFICATION FACTOR FOR RAILWAY BRIDGES SUBJECTED TO A SERIES OF MOVING MASS

Abstract eng:
This paper investigates the vertical dynamic behavior of steel rail viaducts subjected to train passage. The analyses in this study take into account the dynamics of the vehicle suspension systems, the mass of bogies and car bodies, and the dynamic properties of the viaduct as emulated by idealized mass and stiffness values. The rail vehicles are simulated as a series of moving mass with various wheel distances traversing over simply supported girders. Using finite element software, LUSAS, the dynamic amplification factors are evaluated and the results are compared with standard design practice for a wide range of speeds and a range of viaduct spans. The results show that the impact factors proposed by design codes are unconservative in many cases especially for high speed trains traversing the short span viaducts.

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