摘要
针对大跨度斜拉桥在持续环境荷载作用下发生形变引起轨道几何形位改变的问题,为评估一大跨度斜拉桥轨道适应性和服役安全性,基于风、温度、人群和非机动车、公路及列车荷载作用下桥梁的梁体变形,采用10 m弦测法计算得到高低和水平偏差,并采用线路静态几何状态评估、轨道谱及动力学评估方法全面评价大跨度斜拉桥轨道几何形位状态。结果表明:在各荷载作用下,大跨度斜拉桥的轨道高低不平顺偏差最大值均不超过经常保养标准限值;各荷载组合下的轨道高低不平顺谱与德国低干扰谱的交点波长同300 km/h速度等级下高低最大敏感波长接近;大跨度斜拉桥的轨道不平顺并不会导致列车产生较大的动力响应。
There are the problems of track geometry change caused by deformation of long span cable-stayed bridge under continuous environmental load.In order to evaluate the adaptability and service safety of a long span cable-stayed bridge track and based on the deformation of bridge beam under wind,temperature,crowd and non-motor vehicle loads,highway and train loads,the height and horizontal deviation were calculated by 10 m chord measuring method.The track geometry state of long span cable-stayed bridge was comprehensively evaluated by railway line static geometry state evaluation,track spectrum and dynamic evaluation methods.The results show that under each load,the maximum value of track height irregularity deviation of long span cable-stayed bridge does not exceed the standard limit of regular maintenance.The intersection wavelength of track irregularity spectrum and German low interference spectrum under each load combination is close to the maximum sensitive wavelength under speed level of 300 km/h.The track irregularity of long span cable-stayed bridge will not lead to large dynamic response of train..
作者
魏贤奎
禹壮壮
刘淦中
王平
陈嵘
WEI Xiankui;YU Zhuangzhuang;LIU Ganzhong;WANG Ping;CHEN Rong(Sichuan Railway Investment Group Co.Ltd.,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-speed Railway Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道建筑》
北大核心
2021年第5期109-114,共6页
Railway Engineering
关键词
大跨度斜拉桥
轨道几何形位
数值模拟
弦测法
轨道谱
动力学评估
long span cable-stayed bridge
track geometry
numerical simulation
chord measuring method
track spectrum
dynamic evaluation
