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本文从随机振动理论及1:10模型试验,研讨车速提高对既有桥梁的动力影响。根据理论分析,当车速提高至140km/h,跨度20m钢板梁冲击系数为1.28,与模型试验结果基本相符。由于内燃机车换算载重小于中载重,冲击系数又低于蒸汽机车,因此从强度承载力而言,按目前中载重设计的桥跨结构能适于车速提高至140～160km/h时的荷载。本文可作为设计准高速铁路桥梁结构的参考。
In this paper, from the theory of random vibration and 1:10 model test, the dynamic influence of the vehicle speed on existing bridges is discussed. According to the theoretical analysis, when the vehicle speed is increased to 140km / h and the impact coefficient of steel beam with a span of 20m is 1.28, it basically agrees with the model test results. Because the converted load of diesel locomotive is less than the medium load and the impact coefficient is lower than that of the steam locomotive, the bridge structure designed according to the current medium load can adapt to the load when the vehicle speed increases to 140 ~ 160km / h in terms of strength bearing capacity. This paper can be used as a reference for designing the quasi-high-speed railway bridge structure.