Simply Supported Girder Bridge On Elastic Long Pillow Without A Frantic Jumble Track Vertical Dynamic Characteristics Analysis

Solid-bed tack with removable resilient ties (STR-D) is a new form of damping track which appears during the development of high-speed railway and urban rail transit, it combines the technological advantages of both long sleeper buried type and elastic supporting block type ballastless track, and overcomes their shortcomings. China’s research of elastic long sleeper track is relatively little, let alone the research of STR-D on bridge. This paper carries out a number of research of STR-D on bridge using the drop wheel-set experiment theory and transient analysis theory of ANSYS software, it’s conclusions can provide guidances in design, laying, maintenance and repair of STR-D on bridge.According to double elastic characteristics of STR-D and drop wheel-set experiment theory, this paper analyzes damping performance of STR-D and determines reasonable range of stiffness of structure under rail and sleeper. This paper analyzes the change of wheel-rail force in different wheels of the same vehicle under a certain speed and the change of wheel-rail force in a certain wheel under different speeds, by using multi-body kinematics theory to establish vehicle-line system. This paper establishes a complete finite element model of STR-D on bridge to firstly conduct a modal analysis of this kind of structure to determine whether it meets relevant provisions of the natural frequency of bridge, and then to separately analyze the influences on dynamic response in various parts of the structure due to the change of train speed, stiffness of structure under rail and sleeper.Calculation and analysis shows:STR-D is a fine damping type ballastless track structure. Reasonable range of stiffness of structure under rail and sleeper are60-120kN/mm and80-180kN/mm. Changing the stiffness of structure under rail and sleeper will infect dynamic response in various parts of the structure. With the raising in train speed, the wheel-rail force in wheel will increase, and so will the dynamic response in various parts of the structure.This paper’s research results can provide guidances in design, laying, maintenance and repair of STR-D on bridge.