城市轨道交通列车-桥梁系统动力响应数值分析及现场测试

Numerical analysis and test of dynamic responses of train-bridge system in urban rail transit

为验证地铁桥梁监测系统采集数据的可靠性,提高轨道交通系统结构设施安全监督力度,以北京地铁5号线惠新西街北口站⁃大屯路东站的三跨连续箱梁桥为研究对象,考虑列车的动力加载效应,通过实验测试与数值模拟计算相互验证、时域分析与频域分析相结合的方法,对行车过程中桥梁的横向、竖向位移及加速度时程曲线及其变化趋势进行分析,验证了计算程序及实验测试结果的可靠性;通过傅里叶变换分析不同车速下桥梁振动加速度频谱,验证了对桥梁振动起控制作用的频率范围;通过计算不同车速下列车的轮重减载率、脱轨系数、横向力、Sperling指标等,对行车安全性及平稳性进行评价。

In order to verify the reliability of the monitoring data collected by the bridge system of Beijing Mass Transit Railway Operation Corporation and improve the structure safety supervision level of the capital,a three span continuous box girder bridge from Huixin-Xijie-Beikou-Station to Datun-East-Road-Station in Metro Line 5 is taken as an example,while the dynamic action be⁃tween a running train and bridge is taken into account,both a field test and numerical calculation are adopted to verify each other,time domain and frequency domain are analyzed meanwhile.The reliability of the written program and the test data are both verified by the vertical and lateral deflection and acceleration responses of the bridge.The frequency domain analysis of the vibration re⁃sponses of the bridge is carried out by the Fourier transform,and the main frequencies contributing to the vibration of the bridge are verified.The offload factor,derailment factor,lateral force and Sperling index of the train at different speeds are calculated,and the running safety and stability of the train are evaluated.