Parameter studies of the dynamic interaction between high-speed trains and simply supported bridges

In this thesis the dynamic interaction between railway bridges and high speed trains is investigated.

The Bernoulli-Euler beam model is used to create a numerical model of railway bridges. Five different load models for the train moving with constant speed are evaluated:

• moving concentrated forces

• moving lumped masses

• single-degree-of-freedom (SDOF) oscillators

• two-degrees-of-freedom oscillators (two SDOF oscillators connected in series)

• multiple-degree-of-freedom oscillators (several oscillators connected in parallel and series, with pitching)

The mechanical problem of vibrating beams is solved using the modal superposition method. The differential equation of the coupled bridge-train interaction system is solved by means of the numerical method of Newmark.  The influence of variation of parameters and choice of the mechanical train model on bridge-vehicle-interaction is subject of the studies. Varied parameters are for example bridge span, the ratio vehicle frequency to first bending frequency of the bridge, the ratio mass of the bridge to mass of the train and damping of the vehicle respectively bridge. The Austrian train Railjet is used as train-model. For parameter variation a generic train model has been created. In the last section of the work the influence of the acceleration of the body on travelling comfort is investigated.



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