Deformation Pre-set Value Control Technology of Hyperbolic Diagonal Intersecting Grid Cylinder Cooling Tower Construction
The form and stress state of large complex steel structures are dramatically affected by construction technology.To ensure that the structural molding form is close to the design form within a certain deviation,and the bearing requirements of the structure is met with regard to the combination of structural additional internal force and design load after the construction is completed,a fine pre-set value research on the construction process of large complex steel structure is necessarily carried out.For a hyperbolic diagonal intersecting grid cylinder cooling tower project,this paper proposes and compares the two construction methods of no support bed-jig and temporary support bed-jig set up at the bottom.The forward iteration method is adopted to calculate the structural deformation pre-set value,the changes of radial displacement between the layers of the cooling tower are elaborated and explained,meanwhile,the effect of the iteration times on the calculation of structural deformation pre-set value and the efficiency of the calculation is explored.The results show that the use of the support bed-jig at the bottom is helpful in reducing the overall deformation of the structure with only self-weight,the molding form is closer to the design configuration with the aid of the support bed-jig.The radial displacement of different floors of the structure is related to the self-weight of the members,the supports and the reinforcing layer.The difference between the one-time calculation and the forward iteration(9 times)is about 3%at most,the forward iteration applied in the analysis of this type of structure is feasible with considering the acceptable efficiency and accuracy.
万方数据
维普
