Optimal damping between two adjacent elastic structures

Luco, J. Enrique; Barros, F.C.P. de

doi:10.1002/(sici)1096-9845(199807)27:7<649::aid-eqe748>3.0.co;2-5

Cited by 119 publications

(53 citation statements)

References 3 publications

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“…Luco and De Barros [10] calculated the optimal number of interconnecting dampers uniformly distributed over two structures to minimize the transfer function amplitude of the top displacement of the taller building. Zhang and Xu [11] found the optimal values of visco-elastic dampers to reduce the maximum seismic response to values below the random seismic response.…”

Section: Introductionmentioning

confidence: 99%

Bi̇ti̇şi̇k Ni̇zam Yapilarin Çarpişmasini Önlemek İçi̇n Bi̇r Hedef Sönüm Orani Ve Rölati̇f Deplasman Düşünülerek Opti̇mum Sönümleyi̇ci̇ Yerleşi̇mi̇

Aydın¹,

Öztürk²,

Dikmen³

2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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In this study, viscous dampers are optimally placed between two adjacent structures with the aim of preventing pounding. Governing equations are derived in time domain for the optimization problem. Target damping ratios are obtained for the coupled system and used as active constraints in the numerical optimization stage. The damping coefficients of the dampers are chosen as design variables, and the sum of the damping coefficients is minimized under the constraints. An algorithm featuring numerical optimization and time history analysis is put forward to test the candidate optimal design under the earthquake loads of interest. The relative displacements are checked at all storey levels to ensure that they remain below the target values. Two 4-storey adjacent shearbuilding models are used in numerical examples to validate the proposed method. The appropriate number and locations of linear viscous dampers between adjacent structures are determined, and their effects on structural behaviour are evaluated.Keywords: Pounding, target damping ratio, added dampers, optimal passive control, prevent collision BİTİŞİK NİZAM YAPILARIN ÇARPIŞMASINI ÖNLEMEK İÇİN BİR HEDEF SÖNÜM ORANI VE RÖLATİF DEPLASMAN DÜŞÜNÜLEREK OPTİMUM SÖNÜMLEYİCİ YERLEŞİMİ ÖZBu çalışmada, bitişik nizam iki yapı arasına, sönümleyiciler çarpışmayı önlemek için optimum olarak yerleştirilir. Optimizasyon problemi için yönetici denklemler zaman tanım alanında türetilir. Hedef sönüm oranı girişimli sistem için bulunur ve sayısal optimizasyon aşamasında aktif kısıtlamalar kullanılır. Sönümleyicilerin sönüm katsayıları tasarım değişkeni olarak seçilir ve sönüm katsayılarının toplamı kısıtlamalar altında minimize edilir. Deprem yükleri altında aday optimum tasarımı test etmek için zaman tanım alanında analizleri ve sayısal optimizasyonu içeren bir algoritma gösterilir. Bütün katlarda rölatif deplasmanların hedef değerlerin altına düşüp düşmediği kontrol edilir. Amaçlanan metodun geçerliliğini göstermek için 4 katlı bitişik nizam kayma çerçeveleri sayısal örnek olarak kullanılır. Bitişik yapıların arasına lineer viskoz sönümleyicilerin uygun yerleri ve sayıları hesaplanır ve onların yapısal davranış üzerindeki etkileri araştırılır.Anahtar Kelimeler: Çekiçleme, hedef sönüm oranı, ek sönümleyiciler, optimum pasif kontrol, çekiçlemenin önlenmesi * Corresponding author / Sorumlu yazar.

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Section: Introductionmentioning

confidence: 99%

Bi̇ti̇şi̇k Ni̇zam Yapilarin Çarpişmasini Önlemek İçi̇n Bi̇r Hedef Sönüm Orani Ve Rölati̇f Deplasman Düşünülerek Opti̇mum Sönümleyi̇ci̇ Yerleşi̇mi̇

Aydın¹,

Öztürk²,

Dikmen³

2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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“…Enrique Luco and De Barros (1998) investigated the optimal viscous damping connecting two adjacent shear beams of different heights. For that purpose, they derived the continuous equations (in space) assuming uniformly distributed parameters for each of the beams.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior and Design of Wall–EDD–Frame Systems

Lavan

Abecassis

2015

Front. Built Environ.

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Walls and frames have different deflection lines and, depending on the seismic mass they support, may often possess different natural periods. In many cases, wall-frame structures present an advantageous behavior. In these structures, the walls and the frames are rigidly connected. Nevertheless, if the walls and the frames were not rigidly connected, an opportunity for an efficient passive control strategy would arise: connecting the two systems by energy dissipation devices (EDDs) to result in wall-EDD-frame systems. This, depending on the parameters of the system, is expected to lead to an efficient energy dissipation mechanism. This paper studies the seismic behavior of wall-EDD-frame systems in the context of retrofitting existing frame structures. The controlling non-dimensional parameters of such systems are first identified. This is followed by a rigorous and extensive parametric study that reveals the pros and cons of the new system versus wall-frame systems. The effects of the controlling parameters on the behavior of the new system are analyzed and discussed. Finally, tools are given for initial design of such retrofitting schemes. These enable both choosing the most appropriate retrofitting alternative and selecting initial values for its parameters.

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“…For passive controls, many strategies have been studied for both high-and low-rise adjacent buildings. Gurley et al [4] and Sugino et al [5] have each studied the case of adjacent tall structures with passive devices, while Luca and De Barros [6], Xu et al [7] have studied connecting low-to medium rise structures with passive devices. Mitigating seismic response of adjacent structures connected with active control devices has been investigated by Seto and Mitsuta [8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic analyses of adjacent buildings connected by fluid viscous dampers

Uz¹,

Hadi²

2009

WIT Transactions on the Built Environment

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Building structures are often built close to each other because of lack of available land in metropolitan cities. In this study, the effectiveness of fluid viscous dampers is investigated in terms of the reduction of displacement, acceleration and shear force responses of adjacent buildings. The specific objectives of this investigation are carried out in three parts namely: (1) to formulate the equations of motion for the two adjacent buildings connected with viscous dampers; (2) to find out the effectiveness of fluid viscous dampers in consideration of the threedimensional vibration mitigation analysis when the dampers are connected at all the floors, using both a response spectrum analysis and a time-history analysis; and (3) to investigate the optimal placement of the fluid viscous dampers instead of placing them at all the floors in order to minimise the cost of the dampers. Results show that by using fluid dampers to connect the adjacent buildings of different fundamental frequencies can effectively reduce earthquake-induced responses of either building if damper properties are appropriately selected. Analysis results of this study show that placing fluid viscous dampers at selected floors will result in a more efficient structural system to mitigate earthquake effects.

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Optimal damping between two adjacent elastic structures

Cited by 119 publications

References 3 publications

Bi̇ti̇şi̇k Ni̇zam Yapilarin Çarpişmasini Önlemek İçi̇n Bi̇r Hedef Sönüm Orani Ve Rölati̇f Deplasman Düşünülerek Opti̇mum Sönümleyi̇ci̇ Yerleşi̇mi̇

Bi̇ti̇şi̇k Ni̇zam Yapilarin Çarpişmasini Önlemek İçi̇n Bi̇r Hedef Sönüm Orani Ve Rölati̇f Deplasman Düşünülerek Opti̇mum Sönümleyi̇ci̇ Yerleşi̇mi̇

Seismic Behavior and Design of Wall–EDD–Frame Systems

Dynamic analyses of adjacent buildings connected by fluid viscous dampers

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