摘要
近年来,我国铁路的运输格局发生了较大变化:一方面,建成了大量的高速铁路,铁路钢桥跨度不断增大,同时出现了大量新型构造细节;另一方面,既有铁路将逐步以货运为主,钢桥面临着轴重增加和运量增大的挑战。此外,我国将新建轴重30 t级专用重载铁路,在轴重显著增加的情况下,钢桥构造细节的疲劳问题也更为严峻。疲劳一直是钢桥研究领域中一项重要的课题,在新的运输形势下,新型构造细节的疲劳设计以及既有钢桥的疲劳评估,均成为目前铁路钢桥研究中需要更加重视的课题之一。本文从铁路钢桥疲劳设计方法、设计荷载、性能试验和寿命评估等角度出发,对铁路钢桥疲劳研究现状进行了分析,提出了需要进一步研究的关键技术问题。
In recent years,change happened in China＇s railway transportation pattern.On the one hand,a number of high speed railways have been built.The span of the railway steel bridge kept increase.At the same time,a large number of new structural details emerged.On the other hand,the existing railway used for passengers and freight will gradually give priority to freight transportation.Steel bridge is faced with the challenges of the increase of axle load and traffic volume.In addition our country will build special heavy haul railway carrying axle load up to 30 t.With significant increase in axle load,the fatigue problem of structural details of steel bridge is getting more and more serious.Fatigue has always been an important subject in the research field of steel bridge.In the new transport situation,fatigue design of the new structural details and fatigue assessment of the existing steel bridges have become one of the issues that need to be paid more attention.In this paper from the aspects of fatigue design methods,design load,performance test and life assessment of railway steel bridge,the current status of fatigue in railway steel bridge is analyzed and the key technical problems that need to be further studied are put forward.
出处
《铁道建筑》
北大核心
2015年第10期19-25,共7页
Railway Engineering
基金
中国铁路总公司科技研究开发计划项目(2013G010-A)
关键词
铁路钢桥
疲劳设计荷载
疲劳性能
疲劳寿命评估
Railway steel bridge
Fatigue design load
Fatigue performance
Fatigue life assessment
