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Conditioned simulation of local fields of earthquake ground motion
AbstractOver distances between supports of typical multi-support structures, high-frequency components of earthquake ground motions tend to be weakly correlated in space and low-frequency components of highly correlated. Random field theory, substantiated by empirical data from dense strong-motion arrays, allows engineering characterization of the stochastic input for seismic analysis of multi-support structures, in terms of frequency-dependent spatial correlation functions. The paper extends the methodology of “kriging” (linear estimation theory applied to random functions) to simulation of a local field of earthquake ground motions, consistent with given information about the motions' frequency content and space-time correlation, at an arbitrary set of locations on the free-field surface. Recorded motions may be specified at one or more locations, and the method produces compatible accelerograms at local-field points where the motion has not been recorded. Methodology is first developed for conditional simulation of quadrant symmetric space-time random fields; it is then extended to nonstationary fields and the application to earthquake ground motion simulation is illustrated through several examples.
Conditioned simulation of local fields of earthquake ground motion
AbstractOver distances between supports of typical multi-support structures, high-frequency components of earthquake ground motions tend to be weakly correlated in space and low-frequency components of highly correlated. Random field theory, substantiated by empirical data from dense strong-motion arrays, allows engineering characterization of the stochastic input for seismic analysis of multi-support structures, in terms of frequency-dependent spatial correlation functions. The paper extends the methodology of “kriging” (linear estimation theory applied to random functions) to simulation of a local field of earthquake ground motions, consistent with given information about the motions' frequency content and space-time correlation, at an arbitrary set of locations on the free-field surface. Recorded motions may be specified at one or more locations, and the method produces compatible accelerograms at local-field points where the motion has not been recorded. Methodology is first developed for conditional simulation of quadrant symmetric space-time random fields; it is then extended to nonstationary fields and the application to earthquake ground motion simulation is illustrated through several examples.
Conditioned simulation of local fields of earthquake ground motion
Vanmarcke, Erik H. (author) / Fenton, Gordon A. (author)
Structural Safety ; 10 ; 247-264
1991-01-01
18 pages
Article (Journal)
Electronic Resource
English
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