An Improved Method for Nonstationary Spectral Matching

摘要: Seismic input to nonlinear dynamic analyses of structures is usually defined in terms acceleration time series whose response spectra are compatible with a specified target spectrum. Time domain spectral matching used generate realistic design discussed this paper.A new and improved adjustment function be modifying existing accelerograms while preserving the nonstationary character ground motion presented herein. The application wavelet ensures stability, efficiency speed numerical solution prevents drift resulting velocity displacement series. DOI: 10.1193/1.3459159 INTRODUCTION generally based on spectrum ob- tained from hazard analysis for return period. disaggregation haz- ard then determine controlling earthquake scenario magnitude distance. For many engineering applications, such as critical facilities or highly irregular buildings, more complex often con- ducted. Such requires form that consistent Design developed by initial consist em- pirical recordings past earthquakes representative event simulations event. Two approaches exist modi- fying spectrum: scaling matching. Scaling involves multiplying constant fac- tor so scaled equal exceeds spec- trum over period range. Spectral frequency content match at all periods. Although commonly practice, concept using seismic remains controversial two reasons. First, matches entire represents than one since may an en- velope multiple earthquakes. As result, it believed overestimate structural response. Second, have