| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 100 === The main purpose of this thesis is to improve the bridge structures to decrease the derailment when the high-speed train passes a location with foundation settlements. In order to obtain the precise results, a bridge-train-rail interaction model combined with wheel element, spring-damper, lumped mass, and the rigid link effect is established to perform the train derailment analysis by using the finite element method. For the derailment analysis, the static finite element analyses is applied to study the high-speed train moving on bridges under the foundation settlement, and the Newmark direct integration analyses is applied to find the solution of the high-speed train moving on bridges calculated in static analyses. The results indicate that strengthening the track rail stiffness and reinforcing the track rail by additional beams were not effective methods to decrease the derailment coefficients. Shortening the length of bridge girder eccentricity was an effective method to decrease the derailment condition of high-speed trains during foundation settlement. The influences of rail irregularities will increase the derailment coefficients, as a result, a smooth rail can decrease the derailment coefficient when passing the location with settlement. Moreover, the derailment coefficients increase with the train speed. Thus, when passing the location with foundation settlements, decrease the train speed is the best way to ensure safety.
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