Abstract
Having a predominant pulse is the main feature for pulse-like ground motions differing from others. To investigate the influence of the predominant pulse on the inelastic displacement ratios of pulse-like ground motions, the wavelet analysis method is used to extract the predominant pulse. The results indicate that the inelastic displacement ratios of the pulse-removed parts obtained by subtracting the extracted pulse from the original pulse-like ground motions are close to the results of non-pulse-like ground motions. The ratio of the energy of the extracted pulse to the energy of the original ground motion is used to represent the pulse intensity. The results indicate that the pulse period determines the locations in which the inelastic displacement ratios would have noticeable increments, and the pulse intensity determines the degree of the increments. Besides, the effects of five commonly used parameters (PGV, PGD, PGV/PGA, Arias intensity Ia, and soil condition) on the inelastic displacement ratios of pulse-like ground motions and their relations to the pulse period and the pulse intensity are studied. Finally, a new model, in which the influence of pulse intensity is considered, to predict the inelastic displacement ratios of pulse-like ground motions is proposed.
Highlights
Displacement rather than force is starting to become an essential demand parameter for the design, evaluation, and rehabilitation of structures [1, 2]
Inelastic displacement ratio, which is defined as the ratio of the maximum inelastic displacement of a single-degree-offreedom (SDOF) system to the maximum elastic displacement of the same system, provides a simple procedure for estimating the maximum lateral inelastic displacement demand of a structure from its corresponding maximum elastic displacement demand [3,4,5]
The predominant pulse is the main reason causing the difference of the inelastic displacement ratios for pulse-like ground motions differing from others; further studies are needed to analyze the relations of the commonly used parameters to the pulse period and the pulse intensity
Summary
Displacement rather than force is starting to become an essential demand parameter for the design, evaluation, and rehabilitation of structures [1, 2]. Further studies are needed to investigate the key factors that can affect the degree of the increments and to include this effect into the prediction equations for the inelastic displacement ratios of pulse-like ground motions. Investigating the effects of some ground motion parameters on the inelastic displacement ratios of pulse-like ground motions is very meaningful in some relevant areas, such as the ground motion selection for the seismic design of structures in the near-fault zone. The predominant pulse is the main reason causing the difference of the inelastic displacement ratios for pulse-like ground motions differing from others; further studies are needed to analyze the relations of the commonly used parameters to the pulse period and the pulse intensity. To facilitate the use in practice, a new prediction equation is proposed to estimate the mean inelastic displacement ratios of pulse-like ground motions. e pulse intensity is included in the equation as a parameter to control the degree of the increments of the inelastic displacement ratios at medium periods
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