Displacement damping modification factors for pulse-like and ordinary records

Mollaioli, Fabrizio; Liberatore, Laura; Lucchini, Andrea

doi:10.1016/j.engstruct.2014.07.046

Cited by 39 publications

(14 citation statements)

References 37 publications

(73 reference statements)

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“…Moreover, a stiffness-proportional damping matrix of the superstructure is considered, by applying a viscous damping ratio S=1% to the fundamental vibration period of the base-isolated structures [26]. To take into account the uncertainty in the selection of the seismic intensity measure [27] and code-mandated damping modification factor [28] to be adopted for base-isolated structures subjected to near-fault earthquakes, two series of analyses are carried out on the selected ground motions applied with and without the scaling factor described in Section 4.…”

Section: Numerical Resultsmentioning

confidence: 99%

Nonlinear Dynamic Behaviour of Base-Isolated Buildings With the Friction Pendulum System Subjected to Near-Fault Earthquakes

Mazza¹,

Sisinno²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Section: Numerical Resultsmentioning

confidence: 99%

Nonlinear Dynamic Behaviour of Base-Isolated Buildings With the Friction Pendulum System Subjected to Near-Fault Earthquakes

Mazza¹,

Sisinno²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…'den büyük olduğu durumlarda, Mollaioli ve diğ. 'nin [26] (veya Hubbard and Mavroeidis'in, [4]) ve Lin ve Chang'in [9] önerdikleri B değerleri Hatzigeorgiou'nun yönteminden elde edilen değerlerden daha başarılı tahminlerde bulunmaktadır. %10 sönüm oranı için, Mollaioli ve diğ.…”

Section: Lin and Chang 2004unclassified

A new approach for estimation of damping reduction factor of oriented ground motion records in an average sense

Ozdemir¹,

Bayhan²

2019

Pamukkale J Eng Sci

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Bu çalışma, sönüm azaltma katsayısının, yer hareketinin yönüne bağlı değişimini incelemektedir. Bu amaçla, seçilen orijinal yer hareketlerinin, birbirine dik yatay bileşenleri, maksimum yer hızlarına göre gruplandırılmış ve bu yatay bileşenler, 0°'den 180°'ye kadar, 10°'lik artımlarla döndürülmüştür. Orijinal ve döndürülmüş kayıtlara ait sönüm azaltma katsayıları, %10, %20 ve %30 sönüm oranları için hesaplanmıştır. Daha sonra, sönüm azaltma katsayısındaki değişimi, yer hareketinin yönüne bağlı olarak hesap etmek amacıyla, basitleştirilmiş yeni bir yöntem önerilmiştir. Sonuçlar, yer hareketi yönünün, sönüm azaltma katsayısının hesabında önemli bir parametre olduğunu ve bu çalışmada önerilen yöntemin, periyot ve sönüm oranından bağımsız olarak, sönüm azaltma katsayısını ortalama bazda hesaplanması bakımından oldukça başarılı olduğunu göstermiştir. This study investigates the dependence of damping reduction factor on ground motion orientation. For this purpose, orthogonal horizontal components of selected as-recorded ground motions, clustered according to their peak ground velocity values, were rotated from 0 o to 180 o with increments of 10 o. Damping reduction factors of all the rotated and original records were computed for damping ratios of %10, %20 and %30. Then, a new simplified method is proposed to estimate the variation in damping reduction factor due to ground motion orientation. The results indicate that ground motion orientation is a significant parameter in computation of damping reduction factor and proposed method is quite satisfactory in estimating damping reduction factor in an average sense regardless of the period and damping ratio.

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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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Displacement damping modification factors for pulse-like and ordinary records

Cited by 39 publications

References 37 publications

Nonlinear Dynamic Behaviour of Base-Isolated Buildings With the Friction Pendulum System Subjected to Near-Fault Earthquakes

Nonlinear Dynamic Behaviour of Base-Isolated Buildings With the Friction Pendulum System Subjected to Near-Fault Earthquakes

A new approach for estimation of damping reduction factor of oriented ground motion records in an average sense

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

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