Application of modified energy method in the nonlinear cyclic behavior of structures

Structural elements exhibit cyclic behavior or hysteresis under seismic loads; therefore, the analysis of this type of response is of great importance in Earthquake Engineering. On the other hand, due to the complexity of this nonlinear behavior and the absence of an explicit function to express the...

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Autores principales:	mohammad Jalili Sadr Abad, Mussa Mahmoudi, reza Mollapour Asl
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2019
Materias:	cyclic behavior modified energy method elasto plastic behavior seismic analysis time history analysis Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/4e0f7328467d4015bcc286f890c095ba
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spelling	oai:doaj.org-article:4e0f7328467d4015bcc286f890c095ba2021-11-08T15:52:22ZApplication of modified energy method in the nonlinear cyclic behavior of structures2476-39772538-261610.22065/jsce.2018.109272.1400https://doaj.org/article/4e0f7328467d4015bcc286f890c095ba2019-11-01T00:00:00Zhttps://www.jsce.ir/article_61780_82a4ed9874dce9c9b276c19b35117217.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Structural elements exhibit cyclic behavior or hysteresis under seismic loads; therefore, the analysis of this type of response is of great importance in Earthquake Engineering. On the other hand, due to the complexity of this nonlinear behavior and the absence of an explicit function to express the restoring-force regarding deformation, the modeling and analyzing of the phenomenon of hysteresis is one of the most complex problems in nonlinear dynamics of structures. In this research, the modified energy method is used as a numerical method to analyze this type of systems. To achieve the objectives of this research, a brief review on elastoplastic hysteresis models is initially considered. Then, by formulating the energy equilibrium equations for single-degree freedom structures with nonlinear material-cyclic behavior, the computer-implemented algorithm of this method is presented in a step-by-step manner. A simple single-degree-of-freedom example with bilinear-elastic stiffness under free vibration using the proposed method is provided for the reader's familiarity with the concept of the proposed method. Subsequently, a one-story structure and a multiple-degrees-of-freedom system with elastoplastic behavior are analyzed using the given method, and conventional numerical methods are utilized to verify the results. In general, the results of this study showed that this method has a good accuracy compared to other techniques in the analysis of hysteresis behavior of structures. In addition, this approach decreases the order in the governing equation of the problem; and, there is no need to define the additional adjustable parameters in numerical solution. On the whole, the presented technique with simplicity in computer execution can be used by creating a physical sense in the analyst to calculate the response of hysteresis structural systems.mohammad Jalili Sadr AbadMussa Mahmoudireza Mollapour AslIranian Society of Structrual Engineering (ISSE)articlecyclic behaviormodified energy methodelasto plastic behaviorseismic analysistime history analysisBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 6, Iss شماره 3, Pp 137-158 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	cyclic behavior modified energy method elasto plastic behavior seismic analysis time history analysis Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	cyclic behavior modified energy method elasto plastic behavior seismic analysis time history analysis Bridge engineering TG1-470 Building construction TH1-9745 mohammad Jalili Sadr Abad Mussa Mahmoudi reza Mollapour Asl Application of modified energy method in the nonlinear cyclic behavior of structures
description	Structural elements exhibit cyclic behavior or hysteresis under seismic loads; therefore, the analysis of this type of response is of great importance in Earthquake Engineering. On the other hand, due to the complexity of this nonlinear behavior and the absence of an explicit function to express the restoring-force regarding deformation, the modeling and analyzing of the phenomenon of hysteresis is one of the most complex problems in nonlinear dynamics of structures. In this research, the modified energy method is used as a numerical method to analyze this type of systems. To achieve the objectives of this research, a brief review on elastoplastic hysteresis models is initially considered. Then, by formulating the energy equilibrium equations for single-degree freedom structures with nonlinear material-cyclic behavior, the computer-implemented algorithm of this method is presented in a step-by-step manner. A simple single-degree-of-freedom example with bilinear-elastic stiffness under free vibration using the proposed method is provided for the reader's familiarity with the concept of the proposed method. Subsequently, a one-story structure and a multiple-degrees-of-freedom system with elastoplastic behavior are analyzed using the given method, and conventional numerical methods are utilized to verify the results. In general, the results of this study showed that this method has a good accuracy compared to other techniques in the analysis of hysteresis behavior of structures. In addition, this approach decreases the order in the governing equation of the problem; and, there is no need to define the additional adjustable parameters in numerical solution. On the whole, the presented technique with simplicity in computer execution can be used by creating a physical sense in the analyst to calculate the response of hysteresis structural systems.
format	article
author	mohammad Jalili Sadr Abad Mussa Mahmoudi reza Mollapour Asl
author_facet	mohammad Jalili Sadr Abad Mussa Mahmoudi reza Mollapour Asl
author_sort	mohammad Jalili Sadr Abad
title	Application of modified energy method in the nonlinear cyclic behavior of structures
title_short	Application of modified energy method in the nonlinear cyclic behavior of structures
title_full	Application of modified energy method in the nonlinear cyclic behavior of structures
title_fullStr	Application of modified energy method in the nonlinear cyclic behavior of structures
title_full_unstemmed	Application of modified energy method in the nonlinear cyclic behavior of structures
title_sort	application of modified energy method in the nonlinear cyclic behavior of structures
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2019
url	https://doaj.org/article/4e0f7328467d4015bcc286f890c095ba
work_keys_str_mv	AT mohammadjalilisadrabad applicationofmodifiedenergymethodinthenonlinearcyclicbehaviorofstructures AT mussamahmoudi applicationofmodifiedenergymethodinthenonlinearcyclicbehaviorofstructures AT rezamollapourasl applicationofmodifiedenergymethodinthenonlinearcyclicbehaviorofstructures
_version_	1718441658649935872

Application of modified energy method in the nonlinear cyclic behavior of structures

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