Abstract
Ballastless track is a composite structure made of reinforced concrete materials, whose temperature characteristics can be easily influenced by ambient factors (air temperature and solar radiation). Based on an on-site test in Chengdu, temperature of track superstructure, air temperature and solar radiation intensity are obtained for CRTS I twin-block ballastless track. The relationship between ambient factors and temperature of track superstructure was conduct by the method of statistical analysis, the results show that temperature of track slab, and base plate, air temperature and solar radiation intensity all show a periodical change with the day. The average maximum difference between track slab’s temperature and air temperature is within 6 ℃, and the average difference between maximum and minimum temperature of base plate is only 1.34 ℃. The temperature gradient of track slab also shows a periodical change with the day. The maximum positive and negative temperature gradient of track slab are 92.12 and −28.55 ℃/m, and the average maximum of positive and negative temperature gradient are 50.58 and −14.56 ℃/m.
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