Evaluation of the damping modification factor for structures subjected to near-fault ground motions

Pu, Wuchuan; Kasai, Kazuhiko; Karoki, Kabando Erastus; Huang, Bin

doi:10.1007/s10518-016-9885-8

Cited by 35 publications

(9 citation statements)

References 21 publications

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“…This quantity is plotted versus the ratio T/T p , as shown in Figure 9 for RotD50 (a) and FN (b) pulse-like waveforms. This approach to represent the residuals was also adopted by many authors [27][28][29][30][31]. The introduction of the ratio T/T p leads evident that the mean curve of the residuals has the typical bell-curve shape with a "bump" centered close to ratio T/T p = 1.…”

Section: Narrowband Amplification Factormentioning

confidence: 99%

An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records

et al. 2020

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Near-source effects can amplify seismic ground motion, causing large demand to structures and thus their identification and characterization is fundamental for engineering applications. Among the most relevant features, forward-directivity effects may generate near-fault records characterized by a large velocity pulse and unusual response spectral shape amplified in a narrow frequency-band. In this paper, we explore the main statistical features of acceleration and displacement response spectra of a suite of 230 pulse-like signals (impulsive waveforms) contained in the NESS1 (NEar Source Strong-motion) flat-file. These collected pulse-like signals are analyzed in terms of pulse period and pulse azimuthal orientation. We highlight the most relevant differences of the pulse-like spectra compared to the ordinary (i.e., no-pulse) ones, and quantify the contribution of the pulse through a corrective factor of the spectral ordinates. Results show that the proposed empirical factors are able to capture the amplification effect induced by near-fault directivity, and thus they could be usefully included in the framework of probabilistic seismic hazard analysis to adjust ground-motion model (GMM) predictions.

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Section: Narrowband Amplification Factormentioning

confidence: 99%

An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records

et al. 2020

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“…A considerable number of studies on the derivation of damping modification factors have been published; only the researches that have most influenced this work are reported herein [Lin, Chang 2003, 2004Atkinson, Pierre 2004;Lin et al 2005;Bommer, Mendis 2005;Cameron, Green 2007;Stafford et al 2008;Casarotti et al 2009;Cardone et al 2009;Hatzigeorgiou 2010;Hao et al 2011;Sheikh et al 2013;Rezeian et al 2014;Bradley 2015;Mollaioli et al 2014;Mavroeidis 2015;Benahmed et al 2016;Pu et al 2016;Palermo et al 2016]. These works examine the influence of a number of issues: fundamental period of the construction, input duration, distance from the site to the hypocenter, magnitude of the earthquake, soil type, forward-directivity effect (near-fault), among others.…”

Section: State-of-the-art Of Research On Damping Modification Factorsmentioning

confidence: 99%

Generating damping modification factors after artificial inputs in scenarios of local records scarcity

Almansa

2018

Bull Earthquake Eng

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150 to 250 words)The damping modification factors are utilized to alter the design spectral ordinates for constructions whose damping differs significantly from 5%, this being the level that is routinely considered by most codes. Such factors are habitually evaluated after suites of historical inputs representing the local seismicity. However, such records may not be readily available, due either to moderate seismicity or to limited seismological network; in such cases, representative artificial accelerograms might be used instead. This paper proposes a methodology for establishing damping modification factors after artificial inputs generated to match the 5% design spectra; this approach can be used for countries, regions or cities. The proposed methodology is based on performing dynamic analyses on underdamped and overdamped SDOF linear systems by using the aforementioned selected accelerograms. Although previous studies have highlighted the differences among factors generated after natural and artificial inputs, it has been observed that such discrepancies are mainly due to the longest significant (Trifunac) duration of the artificial accelerograms. Therefore, the artificial inputs are generated as their duration fits those of the available local strong motion records. An application to Colombia is presented; the results are compared with those for some available Colombian records. The sensitivity of the calculated factors to the soil type, period and seismic zone is investigated; matching expressions are provided. Such expressions are compared with the prescriptions of major design codes and with other studies. The suitability of the proposed formulation is further verified in an example on an isolated hospital building.

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“…In addition to the work of Alavi and Krawinkler, 8 Kalkan and Kunnath, 4 and Sehhati et al, 10 the importance of pulse period (T p ) or the ratio of structural period (T) to pulse period for the seismic design and evaluation of structures under NF ground motions have been demonstrated in several studies. [13][14][15][16][17][18][19] The seismic design and evaluation of structures refer to design spectra, 13 strength reduction factor, 13,14 damping modification factor, 15,16 and seismic responses. [17][18][19] For example, through normalizing the response spectra abscissas of NF ground motions with respect to T p , Mavroeidis et al 13 showed that specifications of design spectra and reduction factors become feasible for NF ground motions.…”

Section: Introductionmentioning

confidence: 99%

Power responses of a building subjected to pulse‐like ground motions

Lin

2021

Earthq Engng Struct Dyn

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Compared with non-pulse-like ground motions, pulse-like ground motions are usually near-fault motions with forward directivity or fling-step effect. These pulse-like ground motions are characterized by prominent velocity pulses. The impact force caused by such velocity pulses is generally more destructive than the inertia force induced by ground accelerations. The impact force infuses substantial energy into structures within a rather short period. The power responses of buildings are thus crucial for understanding the risk potential posed by pulselike ground motions. This study innovatively defines the power responses of a building as the product of story shear and inter-story velocity. It investigates the power responses of a vertically irregular three-story building subjected to two ensembles of pulse-like and non-pulse-like ground motion records. The results show that power demand is a competent measure that reflects the effect of pulselike ground motions on building structures.

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Evaluation of the damping modification factor for structures subjected to near-fault ground motions

Cited by 35 publications

References 21 publications

An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records

An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records

Generating damping modification factors after artificial inputs in scenarios of local records scarcity

Power responses of a building subjected to pulse‐like ground motions

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