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CivilComp Proceedings
ISSN 17593433 CCP: 96
PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping and Y. Tsompanakis
Paper 8
Prediction Models for Building Structure Response arising from Railway Traffic J. Bencat, O. Kubovcík and D. Papán
Department of Structural Mechanics, Faculty of Civil Engineering, University of Zilina, Slovakia J. Bencat, O. Kubovcík, D. Papán, "Prediction Models for Building Structure Response arising from Railway Traffic", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", CivilComp Press, Stirlingshire, UK, Paper 8, 2011. doi:10.4203/ccp.96.8
Keywords: microtremor, railway traffic effects on structures, prediction dynamic, half space and structure response models, in situ experimental tests, ground vibration and structure response spectra, spectral analysis.
Summary
The dynamic traintrack interaction is a coupled problem, contrary to vehicleroad interaction problems, that requires the simultaneous solution of the equations of motion of the train and the track. The traintrack interaction forces arising from the track unevenness are computed using a flexibility formulation. A twodimensional linear vehicle model with a limited number of degreesoffreedom is coupled to a linear elastic longitudinal invariant track model, which allows the solution of the equations of motion in the frequencywavenumber domain. The transfer functions between the track and the soil and the computed interaction forces are used to compute the response at any arbitrary point in the free field [1].
An analytical expression for the spectral density of ground vibration as functions of distance from both roadways and railways respectively is formulated in terms of rail and wheel roughness, vehicle characteristics, tracksoil interaction forces and the frequency response function for the ground. The use of the random process theory to predict the level of ground vibration in the vicinity of railways using the calculation of the spectrum of vibration at the halfspace point is possible using the two principal ways: (i) using a computer implementation of the theoretical expression for the rail roughness spectrum, the vehicle mass distribution spectrum and a model of vehicle dynamics and tracksoil interaction and the frequency response function (FRF) of the ground by a method involving an integral transform, (ii) using the average response force spectrum derived from experimental data for authorized railway category with corresponding track profile and the FRF of the ground and calculate response spectrum vibration at a point by the same way as mentioned in (i). The random process theory in the dynamic ground properties investigation can be utilized as well. Using the input signal (arising from traffic) measurement into the ground and the output signal measurement passing through the ground, the frequency response function, and the elastic and attenuation characteristics of the ground can be obtained. Finally, the building structure dynamic response at the distance point calculation is carried out using halfspace output data (PSD, time history, etc.) for the input data into the building structure foundations. References
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