Thermal Stress of Concrete Structure Subjected to Non-linear Temperature Variation

Abstract:

For investigating the thermal stresses in reinforced concrete structures under the non-linear temperature gradient,an analytical procedure of space structures was presented with the aid of the user-programmable features of ANSYS based on the relaxation-method and the gird-method in sectional analysis.Reinforcing and cracking were also taken into account.In order to study the thermal stresses of the Shanghai south railway station,the temperature variations in the annular girders were measured on site.A simplified formula was proposed to calculate the temperature gradient based on the surveyed data.The forementioned procedure was used to analyze the thermal effect of the main structure.The analytical results show that the temperature load due to solar radiation has a remarkable effect on the concrete structures.

Key words:reinforced concrete structure; thermal stress; non-linear temperature variation; cracking