Lifting optimization method and analysis of long-span steel structures based on precise closure
The sectional lifting construction of large-span steel structures needs to be closed to carry out the subsequent overall lifting.Determining a reasonable lifting method is the premise to ensure accurate closure.For the construction technology of sectional cumulative lifting of large-span steel structures,firstly,the stress and deformation characteristics of the structure during the closure construction process are analyzed and combined with the structural deformation preset value.The optimization method and corresponding numerical simulation method for the sectional lifting of long-span steel structures based on the deformation preset value and precise closure are proposed.Secondly,the sectional lifting optimization method based on deformation pre-adjustment and precise closure is verified and analyzed by a curved beam example.At last,the engineering application of the large span fish-bellied steel structure of Beijing Chaoyang Railway Station is analyzed.The results show that the segmented lifting optimization method based on deformation pre-adjustment value and precise closure is reasonable and accurate,and the method and analysis results can provide scientific reference for the construction of large-span space structure cumulative lifting.
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