CORRELATIONS BETWEEN THE DISPLACEMENT RESPONSE SPECTRA AND THE PARAMETERS CHARACTERISING THE MAGNITUDE OF THE GROUND MOTION

摘要：

Within a Displacement-Based Seismic Design approach, the seismic input is described through displacement design spectra. Until now, these spectra are commonly obtained from the corresponding pseudo-acceleration design spectra, widely used in a Force-Based Seismic Design approach, and are therefore affected by uncertainties regarding the schematization of pseudo-acceleration spectra.In this paper, the relationships between earthquake ground motion parameters and displacement spectra have been faced starting afresh to provide an updated schematization of the spectra which consciously accounts for the most representative ground motion parameters.First, in order to identify the fewest independent parameters which best describes the seismic input, for each record, different earthquake ground motion parameters have been computed and compared to each other through correlation analyses. The results indicate that the parameters Peak Ground Acceleration (PGA), Peak Ground velocity (PGV) and Peak Ground Displacement (PGD) are both necessary and sufficient to exhaustively characterize the seismic input.Second, on the basis of the well-established tripartite earthquake elastic response spectrum, analytical relationships have been derived between the PGA, PGV and PGV parameters and the average amplification factors of the structural response.Finally, simple formulas are proposed for the displacement spectrum which account for the PGA, PGV and PGD. Comparison with common code displacement spectra which accounts for the PGA only show that, to best capture the trend of real earthquake spectra and to avoid both over- and under-estimations, it is fundamental to take into account at least the PGV (if not also the PGD).

关键词： earthquake ground motion parameters displacement spectra linear regression tripartite earthquake response spectrum peak ground acceleration peakground velocity

作者: T. Trombetti S. Silvestri G. Gasparini M. Righi C. Ceccoli

作者单位: Associate Professor, DISTART Dept. of Structural Engineering , University of Bologna, Italy Ph.D Researcher, DISTART Dept. of Structural Engineering , University of Bologna, Italy Professional Engineer, Studio Silvestri, Modena, Italy Full Professor, DISTART Dept. of Structural Engineering , University of Bologna, Italy

会议类型: 国际会议

会议名称: 14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)

会议地点: 北京

会议语种:英文

在线出版日期: 2008-10-12（万方平台首次上网日期，不代表论文的发表时间）