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INTERRELATION BETWEEN NEW HILBERT-HUANG TRANSFORM-BASED SEISMIC INTENSITY PARAMETERS AND STRUCTURAL DAMAGE

. In this study, new proposed seismic intensity parameters based on Hilbert-Huang Transform (HHT) analysis are presented and associated with the seismic damage potential. The HHT is a procedure utilized to gain a better insight into complex seismic signals. Its use to the process of a seismic excitation leads to the evaluation of Hilbert Spectrum (HS). From the investigation of Hilbert Spectrum, derived from velocity-time histories, new frequency-related parameters are evaluated. A first application of the suggested new parameters reveals the interrelation between them and the structural damage of two reinforced concrete frame structures. The results are compared with the corresponding ones obtained from conventional seismic parameters with well-known seismic structural damage interrelation. Park-Ang global structural damage index (DI PA,global ) is used to describe the postseismic structural damage. Thus, a set of recorded seismic accelerograms from all over the word is applied on a seven-story reinforced concrete frame structure, and the values of DI PA,global index are evaluated through nonlinear dynamic analyses and considered subsequently as numerical reference values. Two statistical methods, namely correlation analysis, and multiple linear regression analysis, are applied to the set of conventional parameters and the set of new parameters separately to confirm their interrelation with the caused structural damage. The numerical results validate the significant ability of the proposed HHT-based new seismic intensity parameters to approximate the postseismic structural damage, which presented to be equal to this attained from the established parameters.