Design Ground Motion Library

Abstract

A Design Ground Motion Library (DGML) is being developed that will contain selected recorded acceleration time histories considered to be suitable for use by engineering practitioners for the time history dynamic analysis of various facility types in California and other parts of the Western United States. The DGML will include: (1) the electronic library of selected time histories and their associated ground motion parameters and supporting information on the earthquake source, travel path, and site characteristics; and (2) detailed guidelines for forming and scaling sets of time histories for applications. The characteristics of the seismic environment, including earthquake magnitude, faulting mechanism, source-to-site distance, nearfault directivity conditions, and site conditions, and the damaging characteristics of time histories are being incorporated into criteria for selecting and binning records for the library.

Spectral shape metrics and structural collapse potential

“…All records were downloaded from the PEER ground motion database [22]. For the purposes of this paper each horizontal component was treated as an independent record, for a total of 274 ground motions.…”

A Ground Motion Scaling Method considering Higher-Mode Effects and Structural Characteristics

“…where n p is the number of periods in the response spectrum. In this NRMSE calculation, more than 50 periods per log cycle of period were adopted as suggested (Powers et al 2004, Powers 2004. Figure 4c shows the NRMSEs computed between the averaged elastic response spectrum and the smooth response spectrum for the period ranging from the first to the second vibration modes (T 1X and T 2X ) of the three buildings.…”

ASCONA: Automated Selection of COmpatible Natural Accelerograms

“…Only accelerograms recorded on outcropping rock and in free-field condition are included in the ASCONA database and hence can be used in the selection. This is an important difference of the proposed approach with respect to other methodologies available in the literature, which use indifferently ground motions recorded on different soil types and/or select time histories compatible with response spectra for soils other than rock (e.g., Power et al 2004, Iervolino et al 2010).…”

“…With respect to its original version, the algorithm was modified to avoid having two components of the same record or more than a single record per event, for the reasons already discussed. This is another aspect characterizing the proposed procedure with respect to others available in the literature (e.g., Naeim et al 2004, Power et al 2004, Kottke and Rathje 2008, which allow the presence of multiple records from the same earthquake in the set of selected accelerograms.…”