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RSPMatchBi: a program for spectral matching two-component ground motions

Grant, DN; (2010) RSPMatchBi: a program for spectral matching two-component ground motions. In: (Proceedings) SECED Young Engineers Conference.

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Abstract

Response spectral matching is a technique whereby real recorded ground motions are modified to match a target spectrum to provide consistent input for response history analysis. The program RSPMatch2005, developed by Hancock and co-workers, adds wavelet functions to a single-component seed ground motion, such that multiple period and damping values can be matched, without adding significant energy content to the record. RSPMatch2005 can only operate on one component at a time, and therefore does not consider how bidirectional demand varies with orientation of the ground motion. A new program, RSPMatchBi, is presented that considers two horizontal ground motion components simultaneously. The program modifies the two components such that the resulting ground motion matches both a peak-rotated target spectrum, and the spectrum orthogonal to the peak (referred to as major and minor axis spectra, respectively). The orientation of the major and minor axes are period-dependent, and this dependency is preserved by the spectral matching process. It is shown in an example application that the new program can effectively match the major and minor axis spectra of the record to two individual target spectra, where the two targets are either representative of expected major and minor axis demand, or of the mean demand. The latter may be used to derive effectively orientation-independent ground motions.

Type:Proceedings paper
Title:RSPMatchBi: a program for spectral matching two-component ground motions
Event:SECED Young Engineers Conference
Location:London, UK
Additional information:keywords: By me, Ground motion, Orientation/Components, RspMatch, Scaling, Selection, Spectral matching, Wavelets
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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