摘要
无砟轨道预应力混凝土梁受收缩徐变的影响,会产生后期徐变变形,引起桥梁的上拱和下挠,并且随着时间的延续这种变形增大,导致轨道的不平顺。对广深港客运专线跨沙湾水道(112+2×168+104)m连续刚构模拟计算施工过程,研究成桥后不同的铺轨时间对主梁徐变变形的影响,分析得知铺轨时间对徐变变形影响较大。考虑徐变及温度引起的主梁初始变形对该桥进行车桥耦合振动分析,结果表明动力性能满足要求。
Later deformation will occur at the pre-stressed concrete girder of ballastless track due to the influence of concrete creep,which will lead to hogging and sagging of the bridge.Moreover,this kind of deformation may increase gradually with the increase of time and finally lead to non-smoothness of the track.This article,simulates the whole construction process of the continuous rigid frame bridge with span arrangement(112+168+168+104)m on Guangzhou-shenzhen-Hongkong Passenger-dedicated Railway spanning over Shawan Watercourse,researches the influence on main girder creep deformation of different track laying time after bridge construction being finished,and comes to the conclusion that the laying time of track has bigger influence on the creep deformation.In addition,for this bridge,coupled vibration analysis of vehicle-bridge is made by considering the initial deformation caused by creep and temperature,and the results show that the dynamical performance can meet the requirements.
出处
《铁道标准设计》
北大核心
2012年第10期38-42,共5页
Railway Standard Design
基金
铁四院院控科研项目(2008K07)
关键词
无砟轨道
连续刚构
徐变变形
车桥耦合
ballastless track
continuous rigid frame
creep deformation
coupling of vehicle and bridge
