Dynamic Performance Analysis Of CRTS Ⅲ Slab Track On Bridge

CRTS III slab track is a new non-ballasted track structure, This ballastless track structure set as unit on bridges, using self-compacting concrete instead of CA mortar as the fill layer under the plate. Meanwhile, in order to strengthen the connection between the slab and self-compacting concrete, U-section steel bar is set between them. Two convex plates are set on the base plate to transfer lateral and longitudinal force, and movements of the slab are limited. Since it is the first time for the ballastless tracks used in our country, nothing to learn from experience. Therefore, deep study of orbital dynamics, optimizing the kinetic parameters of ballastless track structure is very important.On the basis of the collection, analysis, absorbing domestic and foreign studies, this article researches in and discusses with dynamic performance of bi-block ballastless track on earth roadbed using vehicles-track vertical coupling dynamics, with the aid in general large-scale finite element dynamics analysis software ANSYS/LS-DYNA establishment bridge-vehicles-track vertical coupling model. Mainly include the following:Collect, collate the relevant domestic and international research of slab track the status quo, and introduced the CRTS III slab ballastless track structure characteristics. Describes the type of track irregularity, the United States, Germany and China the spectrum of track irregularity;local track irregularity waveform parameters and common local track irregularity waveform.Take the Passenger-line's simple beam and continuous beam of the CRTS III slab ballastless track for dynamics calculation and comparison, obtain the results of body, bogie, wheel vertical acceleration is little difference, Therefore, in terms of comfort, both simple beam and continuous beam, not much different;The simple beam's vertical acceleration and displacement of rails, track panels and bridge than continuous beam's, The CRTS III slab ballastless track's dynamic performance of continuous beam is better.Take the CRTS III slab ballastless track of Changkun-line,Chenggui-line and Chengguan-line's 32m simple beam to comparative analysis of dynamic,The CRTS III slab ballastless track at the side of the bridg's vibration and displacement is relatively large. So in design, reinforcement measures should be taken. Also known the better bending stiffness of the bridge, the better dynamic characteristics of track.This paper selects 0.60 m,0.63 m,0.65 m,0.68 m,0.70 m five fastener spacing take to dynamic calculate and compare, The results suggest that the CRTS III slab ballastless track of the fastener spacing to take 0.63m-0.65m.