The Research Of Temperature Stress Of Concrete-Filled Steel Tubular Arch Bridge

The article used the the method that calculated concrete filled steel tubular (CFST) structure temperature stress, analysised factors which can affect temperature stress of the CFST arch bridge ,and finally we can conclude that the change of steel pipe wall thickness and the weld to the steel pipe is not also remarkable influence on temperature stress; and through finite element method(FEM),verified with the Heilongjiang the Yilan Mudanjiang Bridge actual parameter, provided an effective method to construct model; at the same time, it also analysised the effect of solar radiation to arch bridge structure temperature distributed, provided a program process of computation temperature stress.The article summarized the difference among many current developed countries bridge design codes, including Chinese old bridge code, and calculates the Yiwu-binwang Bridge with these codes, and compares with the result of real bridge of simulating the actual temperature to compute with the FEM, the result that using the Chinese old bridge code is smaller than real condition, and the result of Chinese current norm is obviously bigger. So the difference is worth paying attention to design bridge; it is better that the real bridge parameters are used to compute the temperature stress, so we can get that the result is accorded the actuality. If we don't have, we can compute the temperature stress with norm of English bridge. Chinese bridge norm needs probing.The article finally through analyzing of the Zhejiang YiwuBinwang bridge temperature load, obtained the CFST arch bridge temperature stress rules with the temperature load which is including from top to bottom and from margin to core of arch-rib when the temperature value, steel pipe wall thickness value and marking value of concrete change. The rule is that the axial force, bending moment, as well as the shearing force elevates along with the change of temperature increases, so the control section stress which is linear relationship is. The article further proved the change of steel pipe wall thickness and marking value of concrete is not remarkable influence on temperature stress and internal force of arch rib's control section. In actual project, determination the thickness of steel pipe wall and the value of concrete marking needs not to consider the temperature load.