Analysis of Characteristics and Effect Factors of Bi-block Sleeper Ballastless Track Dynamic Stiffness

The track stiffness is one of important parameter of track dynamic characteristics.As a result of dynamic interaction between wheel and track,it is much more reasonable to evaluate track stiffness with dynamic stiffness.The track structural dynamics and frequency domain analysis is used to research the dynamic stiffness characteristics and affect from track parameter of bi-block sleeper ballsstless track.With frequency change,bi-block sleeper ballsstless track has a larger amplitude of variation in dynamic stiffness.While exciting frequency is 81 Hz,dynamic stiffness reaches the minimum 51 kN/mm,about 0.8 times as the static stiffness.Stiffness and damping of fastening have a significant impact on bi-block sleeper ballsstless track.