Experimental Study on Mechanical Properties of Bonded Rebars in Continuous Slab Ballastless Track of High-speed Railway

The anchorage technology of bonded rebars is one of the key technologies for deformation control of continuous ballastless track. In order to study the mechanical properties of the anchorage system of bonded rebars for high-speed railway CRTSⅡ slab ballastless track, a test load system based on multifunctional testing machine was designed, and test concrete blocks simulating the properties of concrete materials and reinforcement of ballastless track structure on site were manufactured. The mechanical performance tests on pull-out and shear resistance of test block under the mode of graded loading were carried out. The test results show that, in the pull-out tests and shear tests, the concrete substrate of base plate (bearing layer) with lower strength is damaged prior to the track plate due to the great difference in the strength of concrete substrate. The pull-out limit damage is characterized by the cone damage on the concrete substrate with the bonded rebars as the cone axis. The shear limit damage is characterized by the shear crack damage of the concrete substrate at the bonded rebars. The ultimate bearing capacity increases with the increase of the concrete strength grade. Under the design test conditions, the pull-out bearing capacity of the two-point bonded rebars is 1.25~1.60 times that of single point bonded rebars. The shear bearing capacity of the two-point bonded rebars is 1.12~1.43 times that of single point bonded rebars. © 2022, Department of Journal of the China Railway Society. All right reserved.