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Numerical modeling of train-induced ground vibrations
The population is growing, and an increasing proportion of the population live in urban areas. As a consequence, human exposure to noise and vibrations is increasing. Larger and denser cities lead to a higher amount of traffic close to where people work and live. Land close to railways and heavily trafficked roads, previously left unexploited, are now being used for dwellings and offices. Vibrations are often accompanied by noise, to which longterm exposure is known to have serious health effects. Furthermore, some buildings such as hospitals and research facilities contain instruments that are highly sensitive to vibrations, and require proper vibration isolation to ensure safe operation. To address the problems of noise and vibrations, their generation and propagation need to be understood.In this thesis, numerical modeling strategies for predicting groundbornevibrations from a surface railway track have been studied. Focus have been on the vibration transmission from the track to the freefield, and to a smaller extent on the actual load generation due to a train running on an uneven rail.The wave propagation in the ground resulting from the dynamic loads on the track can be calculated using numerous numerical techniques. The finite element method offers a large flexibility regarding modeling capabilities in terms of geometrical conditions and material properties. However, the need for discretizing a large soil volume, under and between the track and the receiver, can generate very large systems of equations that are timeconsuming or practically impossible to solve. Computational savings can be made by introducing a coordinate transformation into the governing equations, so that the computational model is formulated in a moving frame of reference following the vehicle. Furthermore, if a horizontally layered viscoelastic halfspace is assumed, a so called Green’s function (a fundamental solution) for the ground dynamic response can be found very efficiently by employing a semianalytical solution procedure in ...
Numerical modeling of train-induced ground vibrations
The population is growing, and an increasing proportion of the population live in urban areas. As a consequence, human exposure to noise and vibrations is increasing. Larger and denser cities lead to a higher amount of traffic close to where people work and live. Land close to railways and heavily trafficked roads, previously left unexploited, are now being used for dwellings and offices. Vibrations are often accompanied by noise, to which longterm exposure is known to have serious health effects. Furthermore, some buildings such as hospitals and research facilities contain instruments that are highly sensitive to vibrations, and require proper vibration isolation to ensure safe operation. To address the problems of noise and vibrations, their generation and propagation need to be understood.In this thesis, numerical modeling strategies for predicting groundbornevibrations from a surface railway track have been studied. Focus have been on the vibration transmission from the track to the freefield, and to a smaller extent on the actual load generation due to a train running on an uneven rail.The wave propagation in the ground resulting from the dynamic loads on the track can be calculated using numerous numerical techniques. The finite element method offers a large flexibility regarding modeling capabilities in terms of geometrical conditions and material properties. However, the need for discretizing a large soil volume, under and between the track and the receiver, can generate very large systems of equations that are timeconsuming or practically impossible to solve. Computational savings can be made by introducing a coordinate transformation into the governing equations, so that the computational model is formulated in a moving frame of reference following the vehicle. Furthermore, if a horizontally layered viscoelastic halfspace is assumed, a so called Green’s function (a fundamental solution) for the ground dynamic response can be found very efficiently by employing a semianalytical solution procedure in ...
Numerical modeling of train-induced ground vibrations
Malmborg, Jens (Autor:in)
01.02.2020
TVSM-3000; (TVSM-3080) (2020) ; ISSN: 0281-6679
Hochschulschrift
Elektronische Ressource
Englisch
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