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.
维普
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