以CRTSⅠ型板式无砟轨道桥隧过渡段为研究对象,对桥梁、板式无砟轨道施加节点温度荷载进行温度场模拟,分析其在整体温度升降和温度梯度共同作用下的温度变形.分别选取我国2条典型高速铁路实测轨道不平顺为随机不平顺,桥梁和轨道板因温度变形而产生的钢轨竖向变形作为附加轨道不平顺,评价列车以不同速度经过桥隧过渡段的车线动力性能.研究表明:当考虑桥梁活动支座存在一定程度的摩擦时,在正温差作用下,桥梁会发生上拱,轨道板会发生板中翘曲;负温差作用下,桥梁会发生下挠,而轨道板会发生四角上翘;在翘曲变形路段,列车动力学指标都有所增大,且随着车速的提高而增大,导致行车安全性和乘坐舒适性相应降低.%Taking the CRTSⅠ slab ballastless track in bridge-tunnel transition section as the research object,the temperature deformations of track slab under overall temperature change and temperature gradient were analyzed under the temperature f ield simulated by applying node temperature load to the bridge and slab. Selecting measured track irregularity of two typical high speed railways as random irregularity,the rail vertical deformation caused by temperature deformation of bridge and slab as additional rail irregularity,train-track dynamic behavior in bridge-tunnel transition section while train passed at different speeds was evaluated.The research shows that,when considering the existence of friction on the bridge bearing,the bridge will arch and the slab will warp under the positive temperature difference. The bridge will bend and the slab will upwarp at the four corners under the negative temperature difference.The train dynamic indexes increase in the warp deformation section,and with the increase of the train speed,the train dynamic indexes increase too,so the driving safety and riding comfort will reduce accordingly.
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