| Abstract:Taking Wenzhou urban railway simply supported beam bridges as the engineering background,this paper discusses the train running performance of urban railway common span beam bridges by calculating and comparing the vibration responses of the vehicles and bridges when the trains through bridges.The following words are the details of the major tasks of this paper:1. This paper systematically reviewed the domestic and international related concepts and theories of the coupled vibration of vehicle-bridge and vehicle-bridge-pier systems after consulting to large amounts of references.2. Based on the principle of total potential energy with stationary value in elastic system dynamics and the rule of "set in right position" for formulating system matrixes, the fine element dynamics models of Wenzhou urban railway low, medium and high piers multi span straight and curved beam bridges are established.3. Based on the above analysis models, it calculates the self-vibration characteristics of above bridges. According to the calculated results,the dynamic characteristics of above bridges are analyzed. The results show that, the eigen-frequencies of Wenzhou urban railway simply supported beam bridges meet the regulatory requirements.4. The responses of vehicle-bridge vibration of Wenzhou urban railway low, medium and high piers multi span straight and curved beam bridges are calculated when the train goes through on single or two-lane by the speeds of60km/h to160km/h. The results show the indicators calculated within the limits.5. According to comprehensive analysis of the train running performance when the train goes through above bridges by different speeds, as well as the comparison of many domestic and foreign existing standards on lateral rigidity of bridge piers, it is demonstrated in this thesis that lateral rigidity limit of pier top should be relaxed when there is a increase in height of railway simply supported beam bridges pier. |
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