Abstract: This paper takes a complex high-rise building as the background and aims to study the mechanical behavior of its "weakly-correlated" structural form under special construction techniques. By establishing a refined finite element model， the construction process of the overall lifting of suspended floors was simulated using the equivalent load method， taking into account the influence of time-varying factors such as concrete shrinkage and creep， as well as the timing of construction loads. Based on this model， numerical simulations were conducted for the entire construction process， revealing the vertical deformation accumulation law of the suspended floors during the installation process from top to bottom layer by layer. The deformation of the suspended floors showed a significant non-uniform spatial distribution and was concentrated at the corners of the structure. At the same time， the deformation gradually increased with the decrease of floor levels， without exhibiting the layer-by-layer stacking effect of strongly-correlated structures. The analysis results indicate that the time-varying effect cannot be ignored in the deformation of the vertical components of the core tube， and reasonable construction adjustment measures can effectively optimize the internal forces of the components.