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Steel and Composite Structures
  Volume 36, Number 4, August25 2020 , pages 481-492
DOI: https://doi.org/10.12989/scs.2020.36.4.481
 


Mapped relationships between pier settlement and rail deformation of bridges with CRTS III SBT
Lizhong Jiang, Lili Liu, Wangbao Zhou, Xiang Liu, Chao Liu and Ping Xiang

 
Abstract
    To study the rail mapped deformation caused by the pier settlement of simply - supported bridges with China Railway Track System III (CRTS III) slab ballastless track (SBT) system under the mode of non-longitudinal connection ballastless track slab, this study derived an analytical solution to the mapped relationships between pier settlement and rail deformation based on the interlayer interaction mechanism of rail-pier and principle of stationary potential energy. The analytical calculation results were compared with the numerical results obtained by ANSYS finite element calculation, thus verifying the accuracy of analytical method. A parameter analysis was conducted on the key factors in rail mapped deformation such as pier settlement, fastener stiffness, and self-compacting concrete (SCC) stiffness of filling layer. The results indicate that rail deformation is approximately proportional to pier settlement. The smaller the fastener stiffness, the smoother the rail deformation curve and the longer the rail deformation area is. With the increase in the stiffness of SCC filling layer, the maximum positive deformation of rail gradually decreases, and the maximum negative deformation gradually increases. The deformation of rail caused by the pier settlement of common-span bridge structures will generate low-frequency excitation on high-speed trains.
 
Key Words
    pier settlement; CRTS III SBT system; geometrical morphology of rail surface; mapped relationships; principle of stationary potential energy; subgrade
 
Address
Lizhong Jiang:School of Civil Engineering, Central South University, Changsha 410075, China;
National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China
Lili Liu, Wangbao Zhou, Xiang Liu, Chao Liu and Ping Xiang:
School of Civil Engineering, Central South University, Changsha 410075, China
 

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