Ain Shams Engineering Journal (Nov 2023)
Seismic response analysis of connected dual-tower isolated structure under three-dimensional earthquakes
Abstract
The study primarily concentrates on investigating the high-rise connected dual-tower frame-shear wall structure, aiming to enhance its vibration control and overall stability. Furthermore, it seeks to assess the effectiveness of the corridor system under rare earthquake conditions and analyze the flexibility of the composite isolation scheme. The specific research methodology involves proposing the installation of isolated layers on both sides of the corridor within the tower structure, utilizing composite three-dimensional isolation bearings in these layers. The corridor and tower are connected flexibly to create a structural control system that incorporates energy dissipation through isolation techniques. Additionally, nonlinear dynamic time-history analyses are conducted on three different structural configurations: the base-fixed dual-tower structure, the single-tower isolated structure, and the dual-tower isolated structure. The primary focus is on discussing the advantages of the dual-tower isolation system. The analysis indicates that both the conventional isolated scheme and the composite isolated scheme exhibit effective control over inter-story displacement and internal forces in the dual-tower structure. The composite isolated scheme demonstrates double-isolated effect of the seismic scheme when subjected to vertical seismic actions. The implemented composite isolated bearings successfully manage the seismic response of vertical displacement and vertical acceleration at the top floor of the tower, reducing the degree of seismic impact by 49.6% and 42.5% respectively, compared to traditional horizontal seismic conditions. By positioning the isolated layer lower, the impact of the corridor on the tower is reduced. The seismic gap between the corridor and the dual-tower provides reference values for designing the dual-tower isolated control system.
