A novel method of searching appropriate ranges of base isolation design parameters through entropy-based classification

Huang, Pei Chiung; Wan, Shiuan; Yen, Jia Yih

doi:10.1002/stc.259

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…önerilen metotlardan bir tanesi izolasyon parametrelerinin belirli koşullara göre optimize edilmesidir. İzolasyon parametrelerinin en uygun çözümü için veri madenciliği [11], uygunluk kriteri metodu [12], yapay sinir ağları [13], stokastik analizi [14] gibi farklı yöntemlerin kullanıldığı birçok çalışma bulunmaktadır. Bu çalışmaların haricinde problemlerin global optimum noktalarını bulmak için geliştirilmiş yarı-sezgisel algoritmaların kullanıldığı çalışmalar da yapılmıştır.…”

Section: Sismikunclassified

Optimization of Linear Seismic Isolation Parameters via Crow Search Algorithm

Çerçevik¹,

Avşar²

2020

Pamukkale J Eng Sci

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Bu çalışmada, karga arama algoritması (CSA) kullanılarak sismik izolatörlü bir yapının izolasyon parametrelerinin optimizasyonu yapılmıştır. Bir kayma çerçevesi modeli ele alınarak tabanına izolasyon sistemi yerleştirilmiştir. Amaç, izolatör deplasman limitlerinin aşılmadan en düşük tepe ivmesini veren izolasyon sisteminin belirlenmesidir. Optimizasyon işlemleri için Matlab programı, yapısal analiz için ise SAP2000 programı kullanılmıştır. İki programın ortak çalışması için açık uygulama-programlama arayüzünden (OAPI) yararlanılmıştır. Yapısal analizler zaman tanım alanında yakın ve uzak saha etkilerine sahip gerçek deprem kayıtları kullanılarak yapılmıştır. Çalışma kapsamında ele alınan sismik izolatörlü yapının gerçekleştirilen doğrusal analizleri sonucunda izolatör deplasmanları sınırlandırılarak optimum izolatör periyodu ve sönüm oranı belirlenmiştir. Analizler farklı izolatör deplasman limitleri ve sönüm oranı aralıkları için yapılmıştır. Farklı deplasman limitleri ve sönüm oranı aralıklarında belirlenen optimum sonuçlar, deplasman üst limitine ulaşılarak elde edilmiştir. Yüksek sönüm oranının kat ivmelerinde artışa neden olması nedeniyle optimum izolasyon parametreleri genellikle en büyük sönüm oranı değerinde bulunmamıştır. Dolayısıyla, en düşük kat ivme değerlerinin elde edilmesi için optimum izolasyon sistem parametrelerinin belirlenmesi gerekmektedir. Kullanılan karga arama algoritması ile elde edilen optimum izolatör parametreleri benzer bir çalışmanın sonuçları ile kıyaslanarak geçerlilikleri ortaya konmuştur.

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Section: Sismikunclassified

Optimization of Linear Seismic Isolation Parameters via Crow Search Algorithm

Çerçevik¹,

Avşar²

2020

Pamukkale J Eng Sci

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“…However, obtaining the best performance from a seismic isolation system requires a true optimization employing an optimization scheme which takes into account the possibility of the structure being subjected to both near-fault and far-fault earthquakes. Besides other alternative proposals such as the use of an NSGA-II non-dominated sorting genetic algorithm (Pourzeynali and Zarif 2008) or the use of Shannon entropy, which is a data-mining method that can classify the proper and improper ranges of isolation system parameters (Huang, Wan, and Yen 2009), harmony search (HS) optimization (Geem, Kim, and Loganathan 2001)-a metaheuristic algorithm which, to the best of authors' knowledge, has not been considered in the optimization of seismic isolation systems before-may provide a viable solution. HS is a memory-based random search optimization method that uses a stochastic random Downloaded by [Florida Atlantic University] at 10:33 21 November 2014 search that can handle optimization problems with discrete variables .…”

Section: Introductionmentioning

confidence: 99%

Optimization of seismic isolation systems via harmony search

Niğdeli

Bekdaş

Alhan

2013

Engineering Optimization

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In this article, the optimization of isolation system parameters via the harmony search (HS) optimization method is proposed for seismically isolated buildings subjected to both near-fault and far-fault earthquakes. To obtain optimum values of isolation system parameters, an optimization program was developed in Matlab/Simulink employing the HS algorithm. The objective was to obtain a set of isolation system parameters within a defined range that minimizes the acceleration response of a seismically isolated structure subjected to various earthquakes without exceeding a peak isolation system displacement limit. Several cases were investigated for different isolation system damping ratios and peak displacement limitations of seismic isolation devices. Time history analyses were repeated for the neighbouring parameters of optimum values and the results proved that the parameters determined via HS were true optima. The performance of the optimum isolation system was tested under a second set of earthquakes that was different from the first set used in the optimization process. The proposed optimization approach is applicable to linear isolation systems. Isolation systems composed of isolation elements that are inherently nonlinear are the subject of a future study. Investigation of the optimum isolation system parameters has been considered in parametric studies. However, obtaining the best performance of a seismic isolation system requires a true optimization by taking the possibility of both near-fault and far-fault earthquakes into account. HS optimization is proposed here as a viable solution to this problem.

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“…Huang et al . used entropy‐based classification (EBC), a data mining tool, to modify the preliminary ranges of design parameters in base‐isolated models. They not only developed proper strategies (increasing or decreasing tendencies of the systems' parameters) but also found appropriate cutting points for the parameters' preliminary design ranges.…”

Section: Introductionmentioning

confidence: 99%

The strategies on base isolation parametric design through modified entropy-based classification approaches

Huang

Wan

Yen

et al. 2013

Struct. Control Health Monit.

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SUMMARY A modified base‐isolated design strategy is proposed and shown to effectively protect precision machinery system against extreme earthquakes. Preliminary presumed range of design parameter in base‐isolated machinery systems could be narrowed down via entropy‐based classification (EBC) by finding an appropriate cutting point for a proper design range. The designs for the modified parametric ranges through EBC effectively raise isolator's energy‐absorbing ability. However, in this pervious work, when all the possible cases are considered to modify the designs of the base‐isolated system, the examined parametric ranges might be a little large. If only one cutting point from EBC is used, some uncertainties in a large parametric range could make imprecise design strategies. Accordingly, modified EBC (MEBC) is introduced in this study for finding more cutting points. Simply speaking, MEBC is the use of EBC more than once. However, some additional limitations must be redefined for EBC to reduce the influence of uncertainty data. A case study is practically presented in this study. Designs for a lead rubber bearing's base‐isolated machinery model located at Central Science Park in Taiwan are made. Ten excitations of Chi‐Chi earthquake from different stations nearby the park are considered. In the results, they are verified that appropriate design strategies from MEBC could raise isolator's energy‐absorbing ability and lower machinery's maximum deformation. Copyright © 2013 John Wiley & Sons, Ltd.

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A novel method of searching appropriate ranges of base isolation design parameters through entropy-based classification

Cited by 10 publications

References 18 publications

Optimization of Linear Seismic Isolation Parameters via Crow Search Algorithm

Optimization of Linear Seismic Isolation Parameters via Crow Search Algorithm

Optimization of seismic isolation systems via harmony search

The strategies on base isolation parametric design through modified entropy-based classification approaches

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