Research Progress on Mechanical Characteristics of Ballastless Track on Long-Span Bridges Under Shrinkage Creep

With the continuous development of science and technology, scholars at home and abroad have found that the shrinkage and creep of concrete will have a significant impact on long-span bridges, thereby causing cracks in the ballastless track on the bridge. Therefore, it is very necessary to conduct in-depth research on the effect of concrete shrinkage and creep on ballastless track on long-span bridges. The main purposes of this paper are: (1) to summarize the main shrinkage and creep models at home and abroad and their mechanisms of action, and to explain the main factors affecting concrete shrinkage and creep and the applicability of different models. (2) to summarize the research on the mechanical properties of ballastless tracks on long-span beam bridges, cable-stayed bridges and continuous rigid frame bridges under concrete shrinkage and creep. In addition, based on the existing research, considering the shrinkage and creep of the ballastless track itself, the research field of the mechanical properties between beams and tracks under the shrinkage and creep effect has certain significance.