重载铁路桥梁地段提速适应性分析

Adaptability Analysis of Speed Increase in Heavy Haul Railway Bridges

摘要: 重载铁路提速是我国区域性经济发展的必然要求，但也面临着提速后桥梁冲击振动加剧，振动幅度加大等不利因素，严重影响到桥梁等结构的稳定性及铁路运营的安全性。本文以朔黄铁路上院村中桥为研究对象，利用现场动力性能试验，研究了列车在提速后运行对桥梁结构动力性能的影响。通过对试验结果分析得出：在C64、C70与C80编组列车作用下，试验测试速度范围内，实测桥梁动力响应与列车速度关系不明显；梁体跨中横向振幅等随列车速度的提高呈增长趋势，但增长幅度较小；活动支座纵向位移与行车速度关系不明显，随列车轴重加载效率的增加而增大；在提速之后桥涵结构仍能满足列车安全运营要求。

Abstract: Heavy haul railway speed increase is an inevitable requirement for China's regional economic de-velopment. However, it also faces unfavorable factors such as increased impact vibration and in-creased vibration amplitude of bridges, which seriously affects the stability of bridges and other structures and the safety of railway operations. This paper takes the middle bridge of Shangyuan Village in Shuohuang Railway as the research object, and uses on-site dynamic performance test to study the effect of train running on the dynamic performance of bridge structure after speed in-crease. According to the analysis of test results, under the action of C64, C70 and C80 trains, the relationship between measured bridge dynamic response and train speed is not obvious within the test of speed range; the transverse amplitude of beam body increases with the increase of train speed. The lateral amplitude of the beam body increases with the increase of train speed, but the growth rate is small; the longitudinal displacement of the movable bearing has no obvious relationship with the driving speed, and increases with the increase of the axle loading efficiency; after the speed increases, the bridge and culvert structure can still meet the train safety operation requirements.