Study on The Influence of Negative Temperature Gradient of U-shaped Girder of Rail Transit in Winter

Abstract

To study the influence of negative temperature gradient of U-shaped girder of rail transit in winter season, a U-shaped rail transit girder was researched in Qingdao. The temperature self-stress of the mid-span section were observed for a 48-h period during the winter. The temperature stress were obtained which caused by vertical and transverse temperature gradient at maximum temperature difference time. The temperature effects caused by different temperature gradient models were analyzed and compared with actual results using a finite element model. The results show that, given the temperature effect, the compressive stress of the mid span section of the structure is small, the web and bottom slab have a greater longitudinal tensile stress which should be considered in the design.