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RISConditional Simulation of Spatially Varying Multicomponent Nonstationary Ground Motions: Bias and Ill Condition
Publisher: ASCE
Abstract: The application of the spectral representation method to the conditional simulation of ground motions can break down because of nonconvergence in inverting the conditioning covariance matrix, and the time-averaged power ...
Time–Frequency Spectral Representation Models to Simulate Nonstationary Processes and Their Use to Generate Ground Motions
Publisher: ASCE
Abstract: In the present study, two new models are proposed to model nonstationary stochastic processes with time-frequency-dependent spectra and coherence. The models are developed based on the discrete orthonormal S-transform and ...
On the Gaussian and Nongaussian Characteristics of Nonstationary Seismic Ground Motions
Publisher: ASCE
Abstract: In earthquake engineering, seismic ground motions are most often modelled as a nonstationary Gaussian process. A few studies indicated that seismic ground motions should be treated as a nonstationary non-Gaussian process, ...
Low-Frequency Characteristics of Vibrations Induced by Transient Unloading of In Situ Stress and Its Influence on Safety of a Deeply Buried Tunnel
Publisher: ASCE
Abstract: High in situ stress is a typical geological characteristic of tunnel excavation in hydropower projects in Southwest China. First, the spectrum characteristics of the vibration induced by the blasting load and transient ...