建筑抗震设计规范反应谱长周期段取值研究OA北大核心

With continuous studies on the characteristics of ground motions,the adverse effects of long-period ground motions on long-period building structures have attracted widespread attention.However,there is still a dearth of considerations for long-period ground motions in current design codes,and the rationality of design response spectra in the long-period section needs to be validated using a large number of ground motions with long-period components.Therefore,standing on the current design response spectra and the statistical characteristics of natural long-period ground motions,a comparative analysis was conducted between the response spectra of natural ground motions and design response spectra.The results show that,in the long-period section,the spectral values of current design response spectra are obviously larger,and the shapes of velocity and displacement spectra are different from the statistical characteristics of natural ground motions.It is found that the Shanghai design response spectra extend the end period point from 6 to 10 s,which can cover longer-period structures,and the seismic isolation design response spectra change the shape of the descending section from a combination of curve and line to an entire curve,which is more in line with the characteristics of natural ground motions.The case study results show that the long-period structural responses based on design response spectra are consistent with the spectral values with different seismic fortifications,proving again that proposing a more accurate long-period design response spectra are critical for seismic design of long-period building structures.