摘要
研究目的:近年来我国高速铁路发展迅猛,主跨超过200 m的大跨度桥梁与无砟轨道适应性成为无砟轨道设计的关键课题之一。为研究列车荷载、温度荷载、温度梯度荷载耦合作用下大跨度桥上无砟轨道疲劳损伤特性,以南昌至赣州客运专线上某(35+40+60+300+60+40+35)m混合梁斜拉桥为例,探讨在高速列车荷载、温度及温度梯度荷载下桥上无砟轨道结构疲劳损伤规律。研究结论:(1)在列车荷载作用下,钢轨最不利位置出现在桥梁跨中,寿命为17年;(2)在列车荷载作用下,道床板寿命由两端向中间阶梯式下降,道床板最不利位置出现在跨中道床板板底,底座板寿命由桥梁两端和桥梁跨中向桥塔附近减小,最不利位置出现在桥塔附近底座板板底;(3)在列车荷载、温度荷载和温度梯度荷载作用下,道床板最不利位置出现在桥梁跨中,底座板最不利位置出现在桥塔附近;(4)气候条件对无砟轨道结构影响较大,桥梁所处城市位置越往南,轨道结构寿命越长,广州地区气候下道床板和底座板寿命分别为哈尔滨的3倍和2.1倍;(5)本研究成果可为主跨超过200 m的大跨度桥梁与无砟轨道适应性问题提供参考。
Research purposes:China’s high-speed railways have developed rapidly in recent years.The adaptability of long-span bridges with more than 200 m main span and ballastless track becomes one of the key issues in the design of ballastless track.In order to study the fatigue damage characteristics of ballastless track on long-span bridge under the coupling of train load,temperature load and temperature gradient load,taking a(35+40+60+300+60+40+35)m hybrid girder cable-stayed bridge from Nanchang to Zhangzhou Passenger Dedicated Line as an example,the fatigue damage law of the ballastless track structure on the bridge under the coupling of train load,temperature load and temperature gradient load is discussed.Research conclusions:(1)Under the train load,the most unfavorable position of the rail appears in the middle of bridge span,and the life is 17 years.(2)Under the train load,the life of the track bed slab is gradually lowered from the two ends to the middle,and the most unfavorable position of the track bed slab appears at the bottom of the plate on the middle bridge span.The life of the base plate is reduced from the two ends of the bridge and the middle of the bridge to the vicinity of the bridge tower,and the most unfavorable position appears at the bottom of the base plate near the bridge tower.(3)Under the action of train load,temperature load and temperature gradient load,the most unfavorable position of the track bed slab appears in the middle of bridge span,and the most unfavorable position of the base plate appears near the bridge tower.(4)The climatic conditions have a great influence on the structure of the ballastless track.The more south the city where the bridge is located is,the longer the life of track structure is.The life of the track bed slab and the base plate under the climate in Guangzhou is 3 times and 2.1 times that in Harbin respectively.(5)The research results can provide reference for the adaptability of long-span bridges with more than 200 m main span and ballastless track.
作者
闫斌
闫晗
黄杰
娄平
YAN Bin;YAN Han;HUANG Jie;LOU Ping(Central South University,Changsha,Hunan 410075,China)
出处
《铁道工程学报》
EI
北大核心
2020年第11期43-48,55,共7页
Journal of Railway Engineering Society
基金
国家重点研发计划项目(2017YFB1201204)
中国铁路总公司科技研究开发计划课题(2015G001-G)。
关键词
铁道工程
斜拉桥
无砟轨道
Miner法则
疲劳
track engineering
cable-stayed bridge
ballastless track
Miner rule
fatigue
