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对现有铁路钢桥进行一系列的动力试验、加速度测量、评估、有限元模拟和安全指数计算。采用专门列车进行动力试验,并获取动力参数。这些参数还可用于建立桥梁的有限元模型。如果模型能够反映实际工况,就能用于计算每种工况下桥梁结构的安全指数。这些安全指数可用于计算杆件的破坏可能性,因此可采用本模型评估桥梁的可靠性。通过了解现有桥梁结构的实际工况,本研究可为新的货运列车重级荷载研究提供可靠依据。
A series of dynamic test, acceleration measurement, evaluation, finite element simulation and safety index calculation are carried out on the existing railway steel bridge. Use special train for dynamic test and obtain dynamic parameters. These parameters can also be used to establish the finite element model of the bridge. If the model can reflect the actual conditions, it can be used to calculate the safety index of the bridge structure under each working condition. These safety indices can be used to calculate the probability of failure of the bar, so the model can be used to assess the reliability of the bridge. By understanding the actual conditions of the existing bridge structure, this study can provide a reliable basis for the study of the new freight train heavy load.