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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 110
PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 278 Damage Effects from Dynamic Interaction between Vehicles, Irregularities and Railway Bridges in the Nonlinear Dynamic Response of Structures T. de O. Abeche 1, R. Dalledone Machado 1,2, J.E. Abdalla Filho 1,3,4, L.F.M. Beghetto 1,5 and L.A.F. de Souza 2,61Mechanical Engineering Graduate Program, Pontifical Catholic University of Paraná, Curitiba, Brazil
2Numerical Methods in Engineering Graduate Program, Federal University of Paraná, Curitiba, Brazil
3Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, United States of America
4Civil Engineering Graduate Program, Federal Technological University of Paraná, Curitiba, Brazil
5Academic Department of Civil Construction, Federal Technological University of Paraná, Curitiba, Brazil
6Department of Civil Engineering, Federal Technological University of Paraná, Apucarana, Brazil Full Bibliographic Reference for this paper
T. de O. Abeche, R. Dalledone Machado, J.E. Abdalla Filho, L.F.M. Beghetto, L.A.F. de Souza, "Damage Effects from Dynamic Interaction between Vehicles, Irregularities and Railway Bridges in the Nonlinear Dynamic Response of Structures", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 278, 2016. doi:10.4203/ccp.110.278
Keywords: damage mechanics, dynamic interaction, finite element, nonlinear dynamics, computational modelling.
Summary
The effects of vehicle-structure interaction have a significant effect on the dynamic responses of both the vehicle and the structure with several applications within the railways field. When the vehicle loads are capable of producing accumulated strains sufficient to cause damage to the structure, the dynamic responses change completely. By crossing a railway bridge, the vehicle is subjected to the effects of track irregularities. The vehicle's movement on the bridge is already a dynamic action on the structure. However, the irregularities of the track tend to excite the vehicle dynamically which in turns triggers additional vibrations in the structure apart from those produced by its own movement, increasing the structural degree of damage. This modifies the structural dynamic responses, increasing the magnitude and the oscillations within the same time interval especially at critical speeds of the vehicle, capable of provoking some resonance. Apart from changing the displacements, velocities and accelerations, the damage alters the structural natural frequencies of vibration. It is not possible to analyse such effects with linear dynamic models. This paper evaluates, using the finite element method, the nonlinear dynamic effects in a reinforced concrete bridge where the degree of damage is altered over time using a damage mechanics procedure.
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