Atmospheric temperature change and solar radiation are the main factors causing thermal expansion and contraction of R/C buildings. In this paper, the effect of the above factors is investigated using non-steady-state heat conduction analysis and three dimensional elastic analysis, and the temperature for thermal stress analysis of the A-wing of the Faculty of Engineering, Hokkaido University is estimated. The thermal movement obtained from the estimated temperature shows a good agreement with the measured movement. Structural damage of 1-story frames subjected to repeated temperature change is also discussed.