Analysis And Control Of Temperature Stress In Super-length Structures

Due to various kinds of long effects of nature environment, the temperature ofthe surface and inside of the concrete structure is changing all the time. Many factorsinfluence it, including geography and facing of the structure, season, intension of thesun radiation, air temperature changing, cloud, fog, rain and so on. Due to badlycapability of heat exchange of the concrete structure which exchange its heatconstantly with air around it by solar radiation, convection, conduction, the surfacetemperature of the structure rise or fall rapidly. However, the inside temperature isn抰change timely. Then large temperature gradients appear. Each parts of the structurehave different temperature condition. This leads large temperature strain which shallbrings great temperature stress when the strain is blocked by the restriction ofstructure.This thesis deducted the solution and analysis method of temperature profilesand thermal effects from the binary differential coefficient equation of heatconduction and the boundary condition which is necessary and considering the naturecondition including solar radiation, air temperature, winds. This analysis method iscorrect and has a certain extent precision after compared the results of the tests andthe calculation data.In the finality, the temperature profiles and thermal effects of the palestra areanalysed by this method and some useful conclusions are acquired which can bereferred by constructions.