Energy-based Seismic Design Method And Application In Seismic Evaluation Of Tall Building Hybrid Structure

In China, tall building hybrid structures (TBHS), which are composed with steel frames and concrete core-tubes (shear-walls), have been widely applied. It is rational to research the seismic response of the TBHS. Presently, the seismic design has been shifted from force-based design to energy-based design. In this thesis, combined with the research project "Research on the behavior of the tall building hybrid structure" financed by the Natural Science Foundation of China (NSFC), several key problems on performance-based design are studied.1. A parametric study is presented on the influence of 3 mathematical modeling of viscous damping on seismic-energy dissipation analysis of TBHS. The study shows that the input energy is not affected by the type of damping model selected, but the ratio of hysteretic to input energy (RHIE) is sensitive to the damping model. The RHIE for the Rayleigh and stiffness-proportional damping model are decreased with the increase of fundamental period of structure, and the period has little influence on the ratio for the mass-proportional damping model. The RHIE for the mass-proportional damping model is the biggest one, with the increase of peak ground velocity to acceleration ratio, the RHIE for the Rayleigh and stiffness-proportional damping model will be close to mass-proportional damping model.2. Seismic responses of different height TBHS are evaluated by using Park-Ang damage mode. A new damage index is proposed for measuring the damage potential of earthquake ground motion records which includes the effects of characteristic parameters of ground motions to structures of different period.3. A parameter study is carried on input energy spectra of linear SDOF system under 42 earthquake ground motions in this paper. It is found that the input energy spectra can be estimated from the pseudo-velocity spectra with a damping factor of 0.5%. A simple analytical procedure is developed for calculating the input energy spectra of linear SDOF system, it can be employed in an energy-based seismic design procedure for determining the required energy dissipation capacity of a structural system.4. The addition of input energy of the first 3 equivalent SDOF systems can accurately calculate the input energy of elastic MDOF system. The inelastic input energy of hybrid structures is relation to the equivalent period of structures. A simple...