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A platform for research: civil engineering, architecture and urbanism
Dynamic considerations in the design of high speed railway bridges
This paper outlines dynamic performance checks required for bridges carrying high-speed rail traffic, and presents time domain numerical simulation techniques for the prediction of performance at the design stage. The sensitivity of the predictions to different modelling assumptions is illustrated. The procedures are described in the context of two example structures where the responses have been measured. Low frequency vibration is predicted for a steel-concrete composite bridge Channel Tunnel Rail Link (CTRL) in southern England. Its dynamic behaviour was subsequently measured in the field during commissioning tests with Eurostar trains at speeds of up to 300km/h. The same simulation technique can be used to predict high frequency vibrations in a structure, which arise principally from wheel and rail roughness. The predicted vibrations can then be used to calculate the noise radiated from the structure by a boundary element technique. This procedure has been validated by noise radiation measurements beneath a bridge on the TGV network in France. The simulation method is shown to provide realistic vibration and noise predictions. The boundary element model requires a mesh that contains at least 6 elements per wavelength of interest, which led to a dimension of approximately 200mm for the concrete elements in this case. A boundary condition corresponding to the previously predicted velocity amplitude and phase defined over the 30- 300Hz frequency range was then specified for each node. This class of problem is very computationally intensive. With 13,000 boundary elements the problem was solved on a HP N4000 machine using the frequency based parallel solver in SYSNOISE. This enabled the number of frequencies (270 in this case) to be divided up amongst a number of processors. The solution time was 70 hours. Today (2004) the analysis would take 10 hours.
Dynamic considerations in the design of high speed railway bridges
This paper outlines dynamic performance checks required for bridges carrying high-speed rail traffic, and presents time domain numerical simulation techniques for the prediction of performance at the design stage. The sensitivity of the predictions to different modelling assumptions is illustrated. The procedures are described in the context of two example structures where the responses have been measured. Low frequency vibration is predicted for a steel-concrete composite bridge Channel Tunnel Rail Link (CTRL) in southern England. Its dynamic behaviour was subsequently measured in the field during commissioning tests with Eurostar trains at speeds of up to 300km/h. The same simulation technique can be used to predict high frequency vibrations in a structure, which arise principally from wheel and rail roughness. The predicted vibrations can then be used to calculate the noise radiated from the structure by a boundary element technique. This procedure has been validated by noise radiation measurements beneath a bridge on the TGV network in France. The simulation method is shown to provide realistic vibration and noise predictions. The boundary element model requires a mesh that contains at least 6 elements per wavelength of interest, which led to a dimension of approximately 200mm for the concrete elements in this case. A boundary condition corresponding to the previously predicted velocity amplitude and phase defined over the 30- 300Hz frequency range was then specified for each node. This class of problem is very computationally intensive. With 13,000 boundary elements the problem was solved on a HP N4000 machine using the frequency based parallel solver in SYSNOISE. This enabled the number of frequencies (270 in this case) to be divided up amongst a number of processors. The solution time was 70 hours. Today (2004) the analysis would take 10 hours.
Dynamic considerations in the design of high speed railway bridges
Dynamische Betrachtungen beim Entwurf von Hochgeschwindigkeitszugbrücken
Willford, Michael R. (author) / Hicyilmaz, Kubilay (author) / Pratt, Karl (author)
2004
4 Seiten, 8 Bilder, 3 Quellen
Conference paper
English
Brücke (Bauwerk) , Hochgeschwindigkeitszug , Design (Entwurf) , dynamisches Verhalten , Zeitbereich , numerische Simulation , Vorhersage , niederfrequente Schwingung , Stahlbetonbau , Verbundkonstruktion , England , Eisenbahnrad , Eisenbahnschiene , Rauigkeit , Schallabstrahlung , Rand-Elemente-Methode
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