高速铁路常用跨度简支箱梁竖向共振条件分析

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (23) : 19-24.

论文

孟鑫1,2

作者信息 +

Vertical resonance condition analysis for simply supported box girder with common span used in high speed railway

MENG Xin1,2

Author information +

文章历史 +

摘要

通过对动车组列车作用于高速铁路常用跨度简支箱梁的竖向共振条件进行理论探讨，并对常用跨度简支箱梁实测竖向自振频率及动力响应数据进行分析，得出如下结论：明确了高速铁路常用跨度简支箱梁在动车组荷载下的竖向共振作用机理，得到了简支箱梁的共振、超谐共振及消振速度计算公式；动车组列车对桥梁的竖向加载频率主要取决于列车速度和车长，加载频率等于桥梁的自振频率或为自振频率的1/2、1/3……时，桥梁结构发生共振或超谐共振；我国高速铁路常用跨度简支箱梁在运营速度（350 km/h）范围内梁体不会发生竖向共振；对高速铁路40 m、32 m和24 m简支箱梁的实测数据分析表明，在运营速度范围内存在2阶、3阶、4阶超谐共振现象，梁体动力响应出现峰值效应，与理论分析结果吻合；简支箱梁的消振速度与桥梁跨度和自振频率相关，当满足消振条件时，桥梁竖向动力响应降低。

Abstract

Vertical resonance condition for a simply supported box girder with common span used in China high-speed railway under action of EMU train with different speeds was explored theoretically.Its actual measured vertical natural frequencies and dynamic response data were analyzed.The results showed that its vertical resonance mechanism is clarified, and the calculation formulas for its resonance speed, super-harmonic one and vibration isolation speed are derived; EMU train’s vertical loading frequency for bridge mainly depends on train speed and its length, when the loading frequency is equal to the bridge’s natural frequency or its 1/2, 1/3……, the bridge structure has resonance or super-harmonic resonance; our country’s simply supported box girder with common span can’t have vertical resonance within the operation speed range of less than 350 km/h.The actual measured data for high-speed railway’s simply supported box girders with a span of 40 m, 32 m and 24 m showed that there are 2nd, 3rd and 4th super-harmonic resonance phenomena within the operation speed range, the girders’ dynamic responses have peak value effect, these results are consistent to those of theoretical analysis; the simply supported box girder’s vibration isolation speed is related to bridge’s span and natural frequencies, when the vibration isolation condition is satisfied, the bridge’s dynamic response drops.

导出引用

孟鑫1,2. 高速铁路常用跨度简支箱梁竖向共振条件分析[J]. 振动与冲击, 2019, 38(23): 19-24

MENG Xin1,2. Vertical resonance condition analysis for simply supported box girder with common span used in high speed railway[J]. Journal of Vibration and Shock, 2019, 38(23): 19-24

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