Complex Modal Shapes Superposition Response Spectrum Based Design Method for Seismically Isolated Structures in China

Seismic isolation technology has become a practical strategy for seismic-resistant design. Several studies have also been proposed to promote the applications of seismic isolation technology in structural engineering and the corresponding design procedures. This study introduces the newly issued Building Seismic Isolation Design Standards of China, in which the framework of an integrated direct design method(IDM) for seismically seismically isolated structures is proposed based on the concept of the Complex-mode-superposition response spectrum. The proposed method is different from the traditional two-stage seismic reduction coefficient design method. The new standard design spectrum for the seismically isolated building is given in the issued Standard. The dynamic history analysis method, the IDM, and the divisional design method(DDM) are employed to conduct the seismic isolation design using the seismically isolated benchmark model. The critical design parameters and analysis results from the China standard are reported and evaluated to facilitate the comprehensive comparisons of the seismic isolation design codes from various countries.