提速条件下重载铁路小半径曲线32m简支T梁动力性能试验研究

The Experimental Study on Dynamic Performance of 32m Simply Supported T-type Beam of Sharp Curves in Heavy-haul Railway under Speed-up Condition

通过对不同轴重、不同速度情况下朔黄铁路芦沟特大桥32m跨度简支T梁进行运营性能试验,测试桥梁结构动力响应,研究提速状态下桥梁结构的动力响应规律。研究结果表明:在30~70km/h时速重载列车作用下,32m简支T梁的横向自振频率、跨中横向振幅、横向加速度、动力系数以及墩顶横向振幅和桥墩横向自振频率均符合《铁路桥梁检定规范》相关要求;随着列车速度提高,桥跨结构横向振动和竖向振动明显增大,墩顶横向振动也有逐渐增大趋势;随列车轴重增加,桥跨结构跨中动挠度逐渐增大,而其他动力性能参数变化规律不明显。

The dynamic test on Lugou extra large bridge with 32 m span simply supported T-type beam in Shuo-Huang Railway under different axle loads and speeds conditions is completed by the operation performance test.The purpose is to discover the dynamic response law of bridge structures under speed-up.The results show that the transverse natural frequencies,mid-span transverse amplitudes,transverse accelerations,dynamic coefficients,pier top transverse amplitudes and pier transverse natural frequencies of 32 m simply supported T-type beams meet the relevant requirements of"Code for Verification of Railway Bridges"under the action of 30-70 km/h heavy-haul trains.The transverse and vertical vibration increase obviously with the speed-up of the train,and the transverse vibration of pier top also increases gradually.With the increase of train axle load,the mid-span dynamic deflection of bridge structure increases gradually,while other dynamic performance parameters do not change obviously.