Temperature Measurement and Temperature Stress Analysis of Ballastless Track Slab

Research purposes: The regulation of all-day temperature variation on general-slab and frame-slab is presented through temperature measurement of ballastless track slab.The regulation of all-day temperature gradient of slab is given.The temperature effect on the slab is analyzed and researched for purpose of instructing the design.Research conclusions:Through measurement,the maximum temperatures of the upper surface and the lower surface of slabs are respectively 16 ℃ and 3 ℃ higher than the local maximum temperature.The temperature difference in the top-bottom surfaces of slab is between 10 ℃ and 13 ℃.The temperature gradient of the slab profile is approximately 0.5 ℃/cm,approaching the linear variation.A calculation model of thermal warping stress of slab is established.Upon calculation,the warping stresses and warping deformations of general-slab are smaller than those of frame-slab,and the warping deformations of general-slab and frame-slab are 0.82 mm and 0.61 mm respectively.The maximum longitudinal warping stresses of general-slab and frame-slab are respectively 1.81 MPa and 1.51 MPa,and the maximum transverse warping stresses of general-slab and frame-slab are 0.75 MPa and 0.58 MPa respectively.