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The research progress on the energy-based seismic design methodology by authors in recent years is presented. Firstly, the relation between energy-based seismic design methodology and traditional seismic design method is discussed. This work points out that a critical condition to realize an energy-based seismic design is that the structure should have a rational damage/energy-dissipation mechanism. Based on this condition, a framework of energy-based seismic design is proposed. Secondly, the energy spectra for energy-based seismic design, including the spectral input energy EI, cumulative hysteresis energy ratio EH/EI for single-degree-of-freedom (SDOF) system, and the relations between energy spectra of SDOF and MDOF systems are briefly introduced. According to the energy spectra, the method to determine the total dissipated energy EH is proposed, which further leads to the method to calculate the dissipated energy EH at the desired positions by using MPA. Therefore, the seismic design of structural elements can be performed based on the elemental dissipated energy EH, the strength demands and the deformation demands. Finally, the application of the proposed energy-based seismic design methodology is demonstrated by the seismic design of a steel braced frame. [ABSTRACT FROM AUTHOR]

Factors affecting seismic base shear and the minimum requirements of seismic base shear for modal response spectrum analysis in the seismic codes of the United States, New Zealand, Canada and Europe were presented. Comparing the factors that were considered in seismic shear factor between the Chinese and American seismic codes and discussion about influence of higher-mode response on seismic base shear of long-period structure, it turns out that seismic shear factor should meet two necessary conditions. Firstly, seismic shear factor associated with the response spectrum shape (determined by site class etc. ). Then, seismic shear factor reflecting the effects of higher-mode and complied with the monotonicity criterion. According to the research report of the SEOAC, the amended seismic shear factor calculation formulae that can avoid the shortcomings of the original one in Chinese 'Code for seismic design of buildings' (GB 50011--2010) was provided. The comparative analysis shows that, the amended seismic shear factor calculation formulae can better reflect the characteristics of seismic base shear and further increase the scope of engineering application. It can provide a reference for the future revision of the seismic code. [ABSTRACT FROM AUTHOR]