| Ningbo Station Reconstruction Project temporary bridge design uses a rigid frame continuous double-track railways temporary bridge for domestic initiative. The bridge must meet the needs of across the deep excavation mainline temporary bridge dynamic performance evaluation, in order to ensure the passenger and freight trains through the temporary bridge structure safely and smoothly.The paper summarizes the analysis of performance at home and abroad and temporary bridge coupled vibration analysis of existing research on the space of the bridge system coupling vibration analyzes.In view of the engineering across the soft soil deep foundation pit, and must ensure safe operation of the normal line of the existing railways engineering characteristics,calculation and analyses the deep foundation pit construction state and the structural dynamic characteristics of structure scheme, elaborated the steel lattice column auxiliary bridge structure dynamic performance systematically.Then, using the random vibration theory, the dynamic simulation of the passenger train to limit speed through a continuous wall support state(II) the whole process of emergency bridge structure, the comprehensive analysis of train operation performance and the structure of the auxiliary bridge dynamic response, and based on 95% reliability was compared with the measured values.Finally, the different speed of passenger trains are simulated with considering elastic pile reinforced concrete plate girder, steel lattice column space coupling vibration response of the system. In combination with the existing standards and research results, comprehensive evaluation in statistical sense the corresponding maximum digging depth of diaphragm wall could support the structure vertical and lateral stiffness of state(V); Reveals the train and coupling vibration mechanism of the auxiliary bridge structure steel lattice column, could optimize the structure design Suggestions are put forward... |
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