Analysis Of Construction Control For Long-span Concrete Filled Steel Tubular Arch Bridge

On the background of the scientific research items about long-span concrete filled steel tubular arch bridge:the huangshan taipinghu river bridge(a 336m span),This thesis is concentrated on long-span concrete filled steel tubular arch bridge for diagonal fastening and connecting by use of jacks and cables , the perfusion order of the construction of concrete filled and the structural stability,analisys on the shrinkageand creep of steel tube concrete and so on.1.By the computer simulation technique analysis of the segmental construction of concrete filled steel tubular arch bridge. This thesis studies the application of dynamic adjusting cables force and accurately calculating the magnitude of pre-evaluated height, the thesis introduces the optimization theory and method into the calculation of erecting arch ribs in the integrated construction technology of dynamic adjusting cables and controlling with pre-evaluated height.2.This thesis also analyzed the process filled concrete into the vacant steel tubular. This paper elicited the perfusion of this bridge and analyzed the influence on the distortion , internal force and stability of the structure by different order concrete filled. 3.The calculation modes of the coefficient of shrinkage and creep of the bulgy core concrete in steel tube are discussed.Based on a few reasonable hypotheses and the stress-strain relation of concrete by the "adjusting valid modulus depending on load time"method,a compact formula is reasoned out,which is applied to calculate the equivalent elastic modulus of the bulgy core concrete considering the affection of shrinkage and creep. So,the analysis of the affection on concrete filled steel tubular arch bridge by shrinkage and creep can be progressed by pole-girder FEM ,further more,the analysis precision is quite high.