Simultaneous optimization of force and placement of friction dampers under seismic loading

Miguel, Letícia Fleck Fadel; Miguel, Leandro Fleck Fadel; López, Rosalía Rodríguez

doi:10.1080/0305215x.2015.1025774

Cited by 48 publications

(25 citation statements)

References 36 publications

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“…3 Equação de um sistema dinâmico sujeito a uma excitação sísmica A equação de movimento de um sistema, com n GDL, sujeito a uma excitação sísmica em sua base pode ser expressa por [13] e [4]:…”

Section: Densidade Espectral De Potênciaunclassified

“…Após a obtenção do sinal, no domínio do tempo, ainda, é necessário normalizar esses valores, de forma que o valor de pico de aceleração do solo 4 esteja de acordo com as características do solo da região em estudo.…”

Section: Geração Da Excitação Sísmicaunclassified

“…Com tais características, vários métodos para a geração de abalos sís-micos foram desenvolvidos ao longo dos anos. Um dos métodos, que tem sido muito bem aceito pela comunidade científica e, em vista disso, adotado em vários trabalhos (por exemplo: [4], [5] e [6]) é o que utiliza a função densidade espectral de potência de Kanai-Tajimi [7] e [8] para a geração do sinal sísmico no domínio da frequência. Com o espectro de potência de Kanai-Tajimi, a aceleração do solo é simulada por meio de um processo estocástico estacionário de ruído branco Gaussiano através do filtro de Kanai-Tajimi.…”

Section: Introductionunclassified

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Geração de uma excitação sísmica através do espectro de Kanai-Tajimi

Chiesa

Miguel

2017

RBCA

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Resumo: O presente artigo apresenta os resultados da implementação de uma rotina computacional, no programa MATLAB R , para a geração de uma excitação sísmica e análise da resposta dinâmica de um edifício, com n graus de liberdade, sujeito a esse tipo de carregamento. Define-se a excitação sísmica como um processo estocástico estacionário unidimensional, passando por um processo de ruído branco Gaussiano através do filtro de Kanai-Tajimi, cuja função densidade espectral de potência permite a geração da aceleração do solo no domínio da frequência. A aceleração do solo é, então, passada para o domínio do tempo gerando um acelerograma sísmico artificial. De posse do acelerograma resolve-se, com a aplicação do método de Newmark, a equação de movimento dinâmico estrutural e encontram-se os deslocamentos, velocidades e acelerações referentes a cada andar do edifício. Por fim, uma análise dos valores máximos, em módulo, dos deslocamentos, acelerações e dos deslocamentos relativos entre os andares é ilustrada. Os resultados encontrados estão condizentes com a literatura confirmando, assim, a eficiência da rotina implementada.Palavras-chave: Excitação sísmica. Kanai-Tajimi. MATLAB R . Abstract:This paper presents the results of a computational routine implementation in the MATLAB R software for the generation of a seismic excitation and dynamic response analysis of a building, with n degrees of freedom, subject to this loading type. The seismic excitation is defined as an one-dimensional stochastic process, that is simulated undergoing by a Gaussian white noise process through a Kanai-Tajimi filter, which the power spectral density function generates the ground acceleration in the frequency domain. The ground acceleration is passed to the time domain generating an artificial seismic accelerogram. With the artificial seismic accelerogram and the application of the Newmark method, the structural dynamic motion equation is solved and the displacements, velocities and accelerations in each building floor are found. Finally, an analysis of the maximum values, in modulus, of the displacements, accelerations and drift is illustrated. The results are in agreement with the literature, confirming the efficiency of the implemented routine.

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Section: Densidade Espectral De Potênciaunclassified

Section: Geração Da Excitação Sísmicaunclassified

Section: Introductionunclassified

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Geração de uma excitação sísmica através do espectro de Kanai-Tajimi

Chiesa

Miguel

2017

RBCA

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“…For this reason, continuous function 2 ( 2 V) = tanh( 2 V) with 2 = 1 × 10 50 was implemented, which was proposed by Mostaghel and Davis [23] and represents discontinuity of Coulomb friction force, where 2 is parameter that controls level of accuracy of function representing friction force. The continuous function 2 was already used in previous studies, for example, [14][15][16][17][18][19]22].…”

Section: Optimization Problemmentioning

confidence: 99%

“…In literature it is possible to find several papers about optimization of Tuned Mass Dampers (TMD), as, for instance, [7][8][9][10][11][12][13]. On the other hand, few works about optimization of friction dampers are found in literature, for example, [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A New Assessment in the Simultaneous Optimization of Friction Dampers in Plane and Spatial Civil Structures

Ontiveros-Pérez

Miguel

2017

Mathematical Problems in Engineering

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This paper presents a methodology to improve installation of friction dampers in civil structures subjected to artificial and real earthquakes using a metaheuristic optimization technique. The Firefly Algorithm is used in this work and it is linked with a computational routine based on Finite Differences Method to solve simultaneous optimization of friction dampers problem. The methodology is implemented for two kinds of structures: a 2D steel frame building and a 3D concrete frame building. The scope of this study is to reduce two different objective functions: (i) the maximum displacement at the top of a structure and (ii) maximum interstorey drift. The results showed that the methodology was able to reduce two objective functions and it can be recommended as an efficient tool to project optimal fiction dampers.

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Effectiveness of friction dampers on the seismic behavior of high rise building VS shear wall system

Armali

Damerji

Hallal

et al. 2019

Engineering Reports

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after first online publication: Majd Armaly's surname has been corrected from 'Majd Armali' to 'Majd Armaly'] The increase in population especially in third world countries demands taller, more flexible, and lighter buildings. Most of these countries are subjected to a high risk of earthquakes, which requires more control of building seismic response. However, several techniques exist to minimize the vibrations induced by an earthquake shock. This paper will discuss the effectiveness of using friction dampers as a passive dissipative device and proposes some design optimization of the number and position of dampers in the building. Friction dampers offer a supplemental damping in conjunction with appropriate stiffness, offering an innovative and attractive solution for the seismic response control of tall structures in risky areas. The originality of this work is in the detailed seismic study of an asymmetric reinforced concrete (RC) building, located in a risky seismic zone and using real earthquake seismic waves. The seismic response of this dissipative structural method is compared with the response of the conventional method (shear wall system) for the high rise building. To accomplish this objective, a nonlinear modal time history analysis using the El Centro earthquake record for a 40-storey RC high rise building, is performed with four different damper type formats using ETABS software. To illustrate the response improvement by dampers, storey accelerations, storey displacements, base shear forces, and storey drifts are compared with a conventional fixed base system (shear wall system) for the same building. Results show that using an optimum position and number of dampers, a tall building can remain operational during a seism.

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Simultaneous optimization of force and placement of friction dampers under seismic loading

Cited by 48 publications

References 36 publications

Geração de uma excitação sísmica através do espectro de Kanai-Tajimi

Geração de uma excitação sísmica através do espectro de Kanai-Tajimi

A New Assessment in the Simultaneous Optimization of Friction Dampers in Plane and Spatial Civil Structures

Effectiveness of friction dampers on the seismic behavior of high rise building VS shear wall system

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