高速铁路列车荷载图式对400 km/h动车组的适应性研究

Study on Adaptability of High-speed Railway Train Load Schema to 400 km/h EMU

本文对我国高速铁路列车荷载图式的制定背景、原则及考虑的运营列车进行调研分析。选择常用跨度桥梁,对不同速度等级下高铁动车组的动效应进行计算,并与列车荷载图式动效应进行比较分析,进而得出列车荷载图式对不同速度等级高速铁路动车组的适应性。针对在设计规范基频取值条件下,考虑动效应后列车荷载图式无法适应运营400 km/h动车组的情况,保证图式及配套动力系数不变,考虑1.1倍的安全储备,提出了相应的梁体设计基频调整建议。另外还对我国高速铁路桥梁的实测基频通常值和设计值的差异进行了分析,结果表明实测基频通常值大于设计值,并能够满足400 km/h动车组的安全运营。研究成果可为我国铁路开行400 km/h动车组的桥梁设计提供依据。

The background,principles and considered operation trains for the formulation of China high-speed railway train load schema are investigated and analyzed in the paper.The bridges with the common spans are selected to calculate the dynamic effect of EMU at different speed levels,which is compared with the dynamic effect of the train load schema for analysis,so as to obtain the adaptability of train load schema to EMU at different speed levels.In view of the fact that the train load schema in consideration of the dynamic effect cannot adapt to the 400 km/h EMU under the conditions with the fundamental frequency values as per the design code,the corresponding suggestions for adjusting the fundamental frequency of beam design are put forward,with 1.1 times of safety reserve,and the schema and supporting power coefficient kept unchanged.In addition,the difference between the normal value and the design value of the measured fundamental frequency of the high-speed railway bridges in China is analyzed.As indicated by the results,the normal value of measured fundamental frequency is greater than the design value,which can meet the safe operation requirements of 400 km/h EMU.The results can provide a basis for the bridge design of 400 km/h EMU in China.