Solar Radiation Affection on Concrete Box Girder Temperature Effect

Abstract:

The paper presents a discussion on the characteristics of the solar radiation intensity and solar radiation absorption coefficient.An analysis is made of the thermal behavior of a simply supported concrete box girder with the finite element program.The paper also presents an analysis on the affection of solar radiation absorption coefficient on the variant range of mid-span deflection,axial deformation and max tensile strain of the box girder.The corresponding conclusions are obtained in the form of equivalent temperature difference.For different concrete surface properties,the solar radiation absorption coefficient varies between 0.4 and 0.8.The calculating result shows that the solar radiation absorption coefficient greatly influences the deformation of concrete box girder.Light color and set-shaped steel formwork are proposed to be used to reduce the temperature effect in practical project.