摘要
为分析桥上有砟轨道结构在重载列车作用下的竖向动力响应,基于ANSYS建立有砟轨道—桥梁系统动力分析有限元模型,将列车荷载简化为集中力,分析研究中—活载及和谐号双机重载列车移动活载作用下桥梁和轨道结构的竖向位移和加速度动力响应。研究结果表明:轨道和桥梁结构跨中竖向位移和加速度响应在HXD1+HXD3+C80作用下最大,最大值为12.60 mm和3.27 mm/s^2,挠跨比为3.94×10^(-4),均小于规范中40 mm,350 mm/s^2和2.5×10^(-3)的要求;行车速度对轨道桥梁结构竖向位移响应影响很小,竖向加速度随着行车速度的增大而增大;增大桥梁刚度可以降低轨道桥梁结构系统的竖向位移和加速度响应,提高行车稳定性和乘客的舒适度;对既有铁路有砟轨道桥梁,应限定行车速度,采取相应的加固措施提高刚度以保证车—轨—桥系统的安全。
In order to analyze the vertical dynamic response of the bridge with ballastless track under the action of heavy haul train,a dynamic analysis finite element model of ballastless track bridge was established based on ANSYS.By simplifying the train load as a concentrated force,the vertical displacement and acceleration dynamic response of the bridge and track structure under the action of live-load and live load of harmony double heavy haul train were studied.The results show that:the vertical displacement and acceleration response of the track and bridge structures are the largest under the action of HXD1+HXD3+C80,and the maximum value is 12.60 mm and 3.27 mm/s2 with corresponding ratio of deflection span being 3.94×10?4,which are less than the requirements of 40 mm,350 mm/s2 and 2.5×10?3;The influence of train speed on the vertical displacement response of track bridge is very small,and the vertical acceleration increases with the increase of driving speed.The increase of bridge stiffness can reduce the vertical displacement and acceleration response of the bridge structure system,and thereby improving the stability and comfort of passengers.On the existing railway ballastless track bridge,the speed should be limited,and corresponding strengthening measures should be taken for the sake of ensuring the security of the vehicle track bridge system.
作者
施成
蔺鹏臻
SHI Cheng;LIN Pengzhen(Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第4期956-961,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金重大资助项目(11790281)
中国铁路总公司科技研究开发计划深题资助项目(2017G010-C)
兰州交通大学优秀平台资助项目(201601)
关键词
铁路桥梁
重载列车
动力响应
数值模拟
railway bridge
heavy haul train
dynamic response
numerical simulation
