Refined Calculation and Demonstration for Sunshine Temperature Difference Effect of Long Span Continuous Beam

Abstract

Abstract The continuous rigid frame bridge of Jiagai River Bridge is (100 + 192 + 100) m, with a main span of 192m, which will break the historical record of 176m of Chaoyang Jialing River Bridge and become the largest continuous rigid frame bridge of single track railway in China. The single track railway continuous rigid frame bridge has the characteristics of large load, poor stability and high prestress requirements. The temperature difference in sunlight will produce temperature deformation and emperature stress in the concrete box girder bridge, which will affect the linear monitoring measurement results. In particular, the sunshine temperature difference will produce nonlinear temperature gradient in the vertical and transverse direction of the cross section of the statically indeterminate box girder bridge, resulting in the generation of temperature self stress and temperature secondary stress. This kind of temperature stress is often large, which leads to the cracking of concrete and even endangers the normal operation in the future. This paper studies the calculation of temperature field, temperature stress and temperature deformation of concrete box girder caused by solar radiation, and compiles a program to realize the visual calculation of sunshine temperature effect.