Abstract:To investigate the seismic behavior of vertically irregular high-rise buildings utilizing a double-story isolation system. Considering that the vertical irregular high-rise structure is easy to be damaged due to the amplification effect of the seismic response during the earthquake, a double-layer isolation structure control system is proposed. This study presented the design of the 24-story vertically irregular high-rise frame shear wall structure, and the finite element model of the double-story isolation structure was established. Additionally, models of the base isolation structure, the mid-story isolation structure, and the aseismic structure were also established for comparative analysis. The dynamic time history analysis of these models was carried out under rare earthquakes By means of numerical simulation. The study findings demonstrate that the best seismic isolation effect was achieved by using double-story isolation system, followed by base isolation structure, and again by mid-story isolation structure. Compared to the aseismic structure, the implementation of the double-story isolation system results in the 1.25-fold increase in the natural period of the structure, with the minimum period ratio. Moreover, it reduces the inter-story displacement angle by approximately 74.3%, diminishes the top-floor acceleration by around 82.3%, decreases the base shear force by approximately 59.68%, mitigates the bottom-floor overturning moment by about 68.89%, and reduces the top-floor torsion angle by about 89.68%. The use of double-story isolation structure system can effectively reduce the overall seismic response of the structure and effectively control the torsional response of the structure.