Wavelet analysis for the characterization of forward-directivity pulse-like ground motions on energy basis

Mollaioli, Fabrizio; Bosi, Anna

doi:10.1007/s11012-011-9433-1

Cited by 35 publications

(16 citation statements)

References 32 publications

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“…When the structure is located within an area close to the seismic fault, eg, within 30 km, 1 particularly high seismic demands are usually imposed. From the seismological perspective, numerous studies have been carried out by using analytical models to characterize the velocity pulses, [4][5][6] accounting for the pulse effects in seismic hazard analysis, 7,8 simulating pulse-like ground motions using stochastic approaches, 9,10 and classifying velocity pulses through automated algorithms. In contrast, the damage resulting from far-field ground motions is typically caused by the repeated cycles of inelastic deformation that accumulates in the structural components.…”

Section: Introductionmentioning

confidence: 99%

“…3 During the past two decades, near-fault pulse-like ground motions have been extensively studied by the seismology and earthquake engineering communities. From the seismological perspective, numerous studies have been carried out by using analytical models to characterize the velocity pulses, [4][5][6] accounting for the pulse effects in seismic hazard analysis, 7,8 simulating pulse-like ground motions using stochastic approaches, 9,10 and classifying velocity pulses through automated algorithms. [11][12][13] From the engineering perspective, the effects of pulse-like ground motions on various structures have been investigated, including idealized single (or multi)-degree-of-freedom (SDOF) systems, 14,15 seismically base-isolated structures, 16,17 bridge structures, 18,19 and some other special buildings or elements.…”

Section: Introductionmentioning

confidence: 99%

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Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

Chang

Luca

Goda

2019

Earthq Engng Struct Dyn

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Summary Near‐fault ground motions can impose particularly high seismic demands on the structures due to the pulses that are typically observed in the velocity time‐histories. The velocity pulses can be further categorized into either a distinct acceleration pulse (acc‐pulse) or a succession of high‐frequency, one‐sided acceleration spikes (non‐acc‐pulse). The different characteristics of velocity pulses imply different frequency content of the ground motions, potentially causing different seismic effects on the structures. This study aims to investigate the characteristics of the two types of velocity pulses and their impacts on the inelastic displacement ratio (CR) of single‐degree‐of‐freedom systems. First, a new method that enables an automated classification of velocity pulses is used to compile a ground motion dataset which consists of 74 acc‐pulses and 45 non‐acc‐pulses. Several intensity measures characterizing different seismological features are then compared using the two groups of records. Finally, the influences of acc‐pulses and non‐acc‐pulses on the CR spectra are studied; the effects of pulse period and hysteretic behavior are also considered. Results indicate that the characteristics of the two types of velocity pulses differ significantly, resulting in clearly distinct CR spectral properties between acc‐pulses and non‐acc‐pulses. Interestingly, mixing acc‐pulses and non‐acc‐pulses can lead to local “bumps” that were found in the CR spectral shape by previous studies. The findings of this study highlight the importance of distinguishing velocity pulses of different types when selecting near‐fault ground motions for assessing the nonlinear dynamic response of structures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

Chang

Luca

Goda

2019

Earthq Engng Struct Dyn

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“…Baker (2007) adopted continuous wavelet transform to extract velocity pulse and proposed a quantitative identification criterion for classifying one target ground motion as pulse-type or non-pulse-type. Yaghmaei-Sabegh (2010, 2012, Mollaioli (2012) and Xie et al (2012) have made some further researches based on the method of Baker (2007). Ghahari et al (2010) extracted velocity pulse using a decomposion method named "moving average filtering".…”

Section: Introductionmentioning

confidence: 99%

On Inelastic Response Spectra of Pulse‐type Ground Motion Based on Decomposition Method

Zhao

Xie

2015

Chinese J of Geophysics

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This article aims to investigate the influence of different frequency components on the amplitude parameters and inelastic response spectral characterizations of pulse-type ground motions. 53 pulse-type ground motions selected from 12 large earthquakes are utilized in this study. First, the high frequency components (HFC) and low frequency components (LFC) of these ground motions are obtained based on multi-scale decomposed method. To compare with the results obtained by traditional methods, the predominant component (PC) which can be used as the representation of the dominant velocity pulse and the residual component (RC) which is obtained by removing the PC from original ground motion are analyzed. Second, the comparison of the amplitude parameters and the inelastic response spectra between original ground motions and four kinds of ground motion components (HFC, LFC, PC, and RC) is performed in order to investigate the influence of ground motion components on the amplitude parameters and inelastic response spectral characterizations of the corresponding original ground motions. Finally, a harmonic ground motion model is used to explore the reasons for the special inelastic response spectral characterizations for pulse-type ground motions. Analysis results show that lowfrequency component is not only the major factor that influences the velocity and displacement amplitude of pulse-type ground motion but also can cause considerable influence on the acceleration amplitude of original ground motion. It is also the immediate causes of the larger inelastic displacement ratio and the smaller inelastic strength reduction factor for pulse-type ground motions. That will result in higher displacement and strength demands for building structure when the structure is subjected to pulse-type ground motions.

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“…It is well known that at locations close to the fault, forward directivity may produce large-amplitude velocity pulses, which may affect the response of structures [19][20][21][22][23][24][25]. In particular, Priestley [26] observed that in the presence of velocity pulses the effectiveness of damping might be reduced.…”

Section: Introductionmentioning

confidence: 99%

Displacement damping modification factors for pulse-like and ordinary records

Mollaioli

Liberatore

Lucchini

2014

Engineering Structures

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Wavelet analysis for the characterization of forward-directivity pulse-like ground motions on energy basis

Cited by 35 publications

References 32 publications

Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

On Inelastic Response Spectra of Pulse‐type Ground Motion Based on Decomposition Method

Displacement damping modification factors for pulse-like and ordinary records

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