Study on longitudinal mechanical properties of slab ballastless track on bridge with rack railway
In order to study the longitudinal mechanical characteristics of CRTS III slab track laid on bridge with rack railway,a fine analysis model of rack-slab track-bridge was established based on the finite element theory and the plastic damage theory of concrete.The results show that the position of the end of the track plate on the uphill side is the most unfavorable position of the load.CRTS III slab track can be directly applied on the track line with slope less than 150‰,and the slab will cause local damage when the slope is greater than 150‰.When the overall temperature variation is 15-25℃,the damage of the slab is greater.The growth rate of longitudinal displacement of the track gradually decreases with the increase of the slope,and the displacement of the base has the largest growth rate.The maximum displacement of the track is about 1.6 mm when the slope is 150‰.The maximum compression of the groove of the base is 0.52 mm.In order to enhance the groove limiting ability,the cushion stiffness on the upper and lower slopes of the groove can be adjusted.The constraint between the track and the bridge is insufficient.For the relatively unstable layer,longitudinal stability measures such as increasing the chiseling degree of the bridge and adjusting the specifications of the embedded steel bars should be taken.
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