Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory

This article investigates the effect of the roof cover and the stressed skin action on the optimal design of curved portal frames. According to stressed skin effect, diaphragm is carrying part of the horizontal force of structure and the remaining part is carried out by the frames. Therefore, interi...

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Autores principales:	afsaneh shahpouri arani, Behrouz Ahmadi-Nedushan, Hoseinali Rahimi Bondarabadi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2019
Materias:	"curved portal frames" "optimal design" "stressed skin effect" "equivalent spring theory" "genetic algorithm" Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/464fcaffc593457097f2357f417d3c13
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spelling	oai:doaj.org-article:464fcaffc593457097f2357f417d3c132021-11-08T15:52:34ZOptimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory2476-39772538-261610.22065/jsce.2017.91588.1261https://doaj.org/article/464fcaffc593457097f2357f417d3c132019-06-01T00:00:00Zhttps://www.jsce.ir/article_53994_33282e822e5f7d213bff5015431e42b7.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616This article investigates the effect of the roof cover and the stressed skin action on the optimal design of curved portal frames. According to stressed skin effect, diaphragm is carrying part of the horizontal force of structure and the remaining part is carried out by the frames. Therefore, interior frames are designed for lower forces which, in turn, results in a lighter structure. Stressed skin effect is modelled using the equivalent spring theory. A program which links Sap2000 and genetic algorithm was developed that provides the best sections which result in the minimum weight of structure. Designs are performed by using the allowable stress design and stress skin effect. Seven curved portal frames with different span dimensions, lengths, number of frames and column heights are considered and optimally designed for roof cover with thickness of 0.5 mm and 0.7mm. The objective function is defined as the weight of the structure and the problem consists of eight design variables. The results show that consideration of the stressed skin effect results in a reduction of weight by more than 20% and that increasing the height of column results in 10% reduction of the weight. Moreover, it was observed that increasing the length of the span results in a 5% reduction in weight. Effects of increasing the number of frames and changing the length of the structure are negligible and are only about 1 or 2 percent of reduction in weight. Increase in the thickness of the roof cover sheet about 0.2 mm results in a decrease of the weight by about 3%.afsaneh shahpouri araniBehrouz Ahmadi-NedushanHoseinali Rahimi BondarabadiIranian Society of Structrual Engineering (ISSE)article"curved portal frames""optimal design""stressed skin effect""equivalent spring theory""genetic algorithm"Bridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 6, Iss شماره ویژه 1, Pp 59-76 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	"curved portal frames" "optimal design" "stressed skin effect" "equivalent spring theory" "genetic algorithm" Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	"curved portal frames" "optimal design" "stressed skin effect" "equivalent spring theory" "genetic algorithm" Bridge engineering TG1-470 Building construction TH1-9745 afsaneh shahpouri arani Behrouz Ahmadi-Nedushan Hoseinali Rahimi Bondarabadi Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
description	This article investigates the effect of the roof cover and the stressed skin action on the optimal design of curved portal frames. According to stressed skin effect, diaphragm is carrying part of the horizontal force of structure and the remaining part is carried out by the frames. Therefore, interior frames are designed for lower forces which, in turn, results in a lighter structure. Stressed skin effect is modelled using the equivalent spring theory. A program which links Sap2000 and genetic algorithm was developed that provides the best sections which result in the minimum weight of structure. Designs are performed by using the allowable stress design and stress skin effect. Seven curved portal frames with different span dimensions, lengths, number of frames and column heights are considered and optimally designed for roof cover with thickness of 0.5 mm and 0.7mm. The objective function is defined as the weight of the structure and the problem consists of eight design variables. The results show that consideration of the stressed skin effect results in a reduction of weight by more than 20% and that increasing the height of column results in 10% reduction of the weight. Moreover, it was observed that increasing the length of the span results in a 5% reduction in weight. Effects of increasing the number of frames and changing the length of the structure are negligible and are only about 1 or 2 percent of reduction in weight. Increase in the thickness of the roof cover sheet about 0.2 mm results in a decrease of the weight by about 3%.
format	article
author	afsaneh shahpouri arani Behrouz Ahmadi-Nedushan Hoseinali Rahimi Bondarabadi
author_facet	afsaneh shahpouri arani Behrouz Ahmadi-Nedushan Hoseinali Rahimi Bondarabadi
author_sort	afsaneh shahpouri arani
title	Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
title_short	Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
title_full	Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
title_fullStr	Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
title_full_unstemmed	Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
title_sort	optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2019
url	https://doaj.org/article/464fcaffc593457097f2357f417d3c13
work_keys_str_mv	AT afsanehshahpouriarani optimaldesignofcurvedportalframewithconsiderationofstressedskinactionusingtheequivalentspringtheory AT behrouzahmadinedushan optimaldesignofcurvedportalframewithconsiderationofstressedskinactionusingtheequivalentspringtheory AT hoseinalirahimibondarabadi optimaldesignofcurvedportalframewithconsiderationofstressedskinactionusingtheequivalentspringtheory
_version_	1718441654760767488

Optimal design of curved portal frame with consideration of stressed skin action using the equivalent spring theory

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