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CivilComp Proceedings
ISSN 17593433 CCP: 98
PROCEEDINGS OF THE FIRST INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo
Paper 115
Railway Traffic Effects on Structures and the Environment J. Bencat and J. Konar
Department of Structural Mechanics, Faculty of Civil Engineering, University of Zilina, Slovakia J. Bencat, J. Konar, "Railway Traffic Effects on Structures and the Environment", in J. Pombo, (Editor), "Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance", CivilComp Press, Stirlingshire, UK, Paper 115, 2012. doi:10.4203/ccp.98.115
Keywords: microtremor, railway traffic effects on structures, prediction dynamic half space response models, in situ tests, spectral analysis.
Summary
The freefield dynamic response at the distance (from the railway track) and dynamic response of building structures are described. In the numerical model (NM) the soils are modelled as a viscoelastic halfspace [1]. This model is used both for evaluation of the tracksoil interaction forces as well as for prediction of the groundborne vibrations. The numerical results in the frequency domain freefield response are presented using the response spectra of the viscoelastic soil medium [2]. Finally this output response (e.g. acceleration) spectrum at a distance are applied as the input spectra for building structure dynamic response calculation arising from railway traffic using the relevant computational building structure model.
The numerical model which calculates the expected groundborne vibration level arising from the railway traffic can be divided in two steps. The first step determines the dynamic tracksoil interaction forces using a detailed train model and the dynamic behaviour of the layered springdamper system and the throughsoil coupling of the sleepers are accounted for the soil model. The calculation of the groundborne vibration level at the distance in the second step is based on the viscouselastics soil model. The analyticalexperimental model proposes the test and the theory data combination to calculate the level of ground vibration. In this process the acceleration spectra measured at the nearest ground point to the track for the individual case study is used as an input signal. The frequency response function (transfer function) of the ground in this approach can be derived using the experimental impulse seismic method (ISM) or crosshole test data, from which elastic and attenuation parameters of the ground can be obtained, too. The output response acceleration spectrum at the distance arising from the input accelerations spectrum can be derived [3]. For calculation of the expected structure dynamic response for example in the frequency domain the response spectrum at a distance is used to obtain the expected structure dynamic response arising from the train. References
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