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| Vertical resonance condition analysis for simply supported box girder with common span used in high speed railway |
| MENG Xin1,2 |
1.Railway Engineering Research Institute, China Academy of Railway Sciences Co, Ltd, Beijing 100081, China;
2.State Key Lab for Track Technology of High-speed Railway, Beijing 100081, China |
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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.
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Received: 18 July 2018
Published: 28 November 2019
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