摘要
为研究CRTSⅢ型板式轨道体系中轨道板与充填层形成复合板的复合受力性能,利用与实际工程相同的材料及工艺制作一个足尺CRTSⅢ型板式轨道体系模型,沿横向切割形成单承轨台和双承轨台的轨道板-自密实混凝土(SCC)充填层复合板试件,对试件开展复合板的横向三点弯曲静载试验研究,得到横向弯矩作用下轨道板与充填层的应力分布、变形发展规律及破坏形态。结果表明,横向弯矩作用下复合板试件的受力破坏表现出明显的两阶段特征:界面滑移之前轨道板与充填层能整体协同受力和变形;界面发生滑移后,轨道板与充填层表现出叠合受力的特征。轨道板板底粗糙度、门形筋数量是决定轨道板与充填层界面黏结滑移行为和复合受力性能的两个关键因素。
To investigate the cooperative working performance of the composite plate formed by track slab and self compacting concrete(SCC)infilling layer in CRTS III slab ballastless track system,a full-scale CRTS III slab ballastless track system model was fabricated using the identical materials and construction technology as those applied in the construction of actual project.The full-scale model was divided into composite plate specimens of track slab-SCC infilling layer with one or two sleepers along the transverse profiles.Transverse three-point bending static load test was conducted on these composite plate specimens to obtain the characteristics of the distribution of stress and deformation of track slab and infilling layer,as well as the failure model of the composite plate subjected to transverse bending from this experiment.The experimental result indicates that the mechanical performance of the track slab-SCC composite plate subjected to transverse bending exhibits significant two-phase characteristics,namely the overall cooperative working and deformation phase before the bond slip on the interface of these two layers,and the independent working and deformation phase as the laminated slab after the bond slip on the interface.The roughness of bottom surface on track slab and the ratio of shear reinforcement on the interface are found to be significant factors influencing the bond-slip behavior of the track slab-SCC interface and the cooperative working performance of the composite plate.
作者
刘晓春
余志武
金城
贺晨
卢朝辉
LIU Xiaochun;YU Zhiwu;JIN Cheng;HE Chen;LU Zhaohui(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory of High Speed Railway Construction Technology,Changsha 410075,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2018年第12期153-160,共8页
Journal of the China Railway Society
基金
国家自然科学基金(U1434204)
湖南省自然科学基金(14JJ3027)
中南大学创新驱动计划(2015CXS014)
关键词
无砟轨道
叠合结构
轨道板
自密实混凝土
黏结滑移
ballastless track
composite structure
slab track
self compacting concrete
bond slip
