Theoretical formulation for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace

Jouneghani, HG; Fanaie, N; Haghollahi, A

Theoretical formulation for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace

Jouneghani, HG Fanaie, N Haghollahi, A

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Publication Type:: Journal Article
Citation:: 2022, 45, (3), pp. 437-454
Issue Date:: 2022-11-10

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Field	Value	Language
dc.contributor.author	Jouneghani, HG
dc.contributor.author	Fanaie, N
dc.contributor.author	Haghollahi, A
dc.date.accessioned	2023-05-24T05:07:01Z
dc.date.available	2023-05-24T05:07:01Z
dc.date.issued	2022-11-10
dc.identifier.citation	2022, 45, (3), pp. 437-454
dc.identifier.issn	1225-4568
dc.identifier.uri	http://hdl.handle.net/10453/170430
dc.description.abstract	Elliptic braced simple resisting frame as a new lateral bracing system installed in the middle bay of frame in building facades has been recently introduced This system not only creates a problem for opening space from the architectural viewpoint but also improves the structural behavior Despite the researches on the seismic performance of lateral bracing systems there are few studies performed on the effect of the stiffness parameters on the elastic story drift and calculation of period in simple braced steel frames To overcome this shortcoming in this paper for the first time an analytical solution is presented for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace subjected to lateral load In addition for the first time in this study a precise formulation has been developed to evaluate the elastic stiffness variation in a steel frame equipped with a two dimensional single story single span elliptic brace using strain energy and Castigliano s theorem Thus all the effective factors including axial and shear loads as well as bending moments of elliptic brace could be considered At the end of the analysis the lateral stiffness can be calculated by an improved and innovative relation through the energy method based on the geometrical properties of the employed sections and specification of the used material Also an equivalent element of an elliptic brace was presented for the ease of modeling and use in linear designs Application of the proposed relation have been verified through a variety of examples in OpenSees software Based on the results the error percentage between the elastic stiffness derived from the developed equations and the numerical analyses of finite element models was very low and negligible Copyright 2022 Techno Press Ltd
dc.language	en
dc.relation.isbasedon	10.12989/scs.2022.45.3.437
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0913 Mechanical Engineering
dc.subject.classification	Civil Engineering
dc.title	Theoretical formulation for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace
dc.type	Journal Article
utslib.citation.volume	45
utslib.for	0905 Civil Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2023-05-24T05:06:59Z
pubs.issue	3
pubs.volume	45
utslib.citation.issue	3

Abstract:

Elliptic braced simple resisting frame as a new lateral bracing system installed in the middle bay of frame in building facades has been recently introduced This system not only creates a problem for opening space from the architectural viewpoint but also improves the structural behavior Despite the researches on the seismic performance of lateral bracing systems there are few studies performed on the effect of the stiffness parameters on the elastic story drift and calculation of period in simple braced steel frames To overcome this shortcoming in this paper for the first time an analytical solution is presented for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace subjected to lateral load In addition for the first time in this study a precise formulation has been developed to evaluate the elastic stiffness variation in a steel frame equipped with a two dimensional single story single span elliptic brace using strain energy and Castigliano s theorem Thus all the effective factors including axial and shear loads as well as bending moments of elliptic brace could be considered At the end of the analysis the lateral stiffness can be calculated by an improved and innovative relation through the energy method based on the geometrical properties of the employed sections and specification of the used material Also an equivalent element of an elliptic brace was presented for the ease of modeling and use in linear designs Application of the proposed relation have been verified through a variety of examples in OpenSees software Based on the results the error percentage between the elastic stiffness derived from the developed equations and the numerical analyses of finite element models was very low and negligible Copyright 2022 Techno Press Ltd

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http://hdl.handle.net/10453/170430