Seismic collapse assessment of a hybrid cold-formed hot-rolled steel building

Kildashti, K; Samali, B; Mortazavi, M; Ronagh, H; Sharafi, P

Seismic collapse assessment of a hybrid cold-formed hot-rolled steel building

Kildashti, K Samali, B Mortazavi, M

Ronagh, H Sharafi, P

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Constructional Steel Research, 2019, 155, pp. 504-516
Issue Date:: 2019-04-01

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Field	Value	Language
dc.contributor.author	Kildashti, K
dc.contributor.author	Samali, B
dc.contributor.author	Mortazavi, M https://orcid.org/0000-0001-5123-7903
dc.contributor.author	Ronagh, H
dc.contributor.author	Sharafi, P
dc.date.accessioned	2022-08-16T01:36:55Z
dc.date.available	2022-08-16T01:36:55Z
dc.date.issued	2019-04-01
dc.identifier.citation	Journal of Constructional Steel Research, 2019, 155, pp. 504-516
dc.identifier.issn	0143-974X
dc.identifier.issn	1873-5983
dc.identifier.uri	http://hdl.handle.net/10453/160290
dc.description.abstract	This paper investigates seismic collapse potential of a hybrid cold-formed hot-rolled system in order to quantify the response modification factor (R-factor) through a procedural method proposed in FEMA-P695. A series of hot-rolled steel (HRS) knee-braced frames in conjunction with cold-formed steel (CFS) stud walls are proposed to resist lateral and gravity loads. ASCE7-16 does not provide seismic performance factors for this hybrid HRS/CFS structural topology in lightweight steel construction and as a result, more sophisticated assessment is needed to measure reasonable seismic performance. A nonlinear numerical model that simulates post-peak response of HRS knee-braced frames is calibrated with experimental data. Post-buckling behaviour of CFS studs are measured according to various techniques in terms of finite strip method (FSM), finite element method (FEM) and AISI-S136-16 analytical formulations. The modelling approach is implemented into nonlinear analytical models of a six-storey steel building which is designed in accordance with ASCE7-16, ANSI/AISC360-16, and AISI-S316-16. A suite of twenty-two bidirectional far-field ground motions are chosen from PEER/NGA database subset and scaled to conditional mean spectrum (CMS) relevant to Urban California region. A set of nonlinear static analysis as well as incremental dynamic analysis (IDA) is conducted to measure collapse fragility and seismic performance of the building. It is concluded that initially assumed R-factor for the proposed structural system maintains the collapse prevention criterion as recommended by FEMA-P695 and is appropriate to be considered for design purposes.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Journal of Constructional Steel Research
dc.relation.isbasedon	10.1016/j.jcsr.2019.01.010
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 0915 Interdisciplinary Engineering, 1202 Building
dc.subject.classification	Civil Engineering
dc.title	Seismic collapse assessment of a hybrid cold-formed hot-rolled steel building
dc.type	Journal Article
utslib.citation.volume	155
utslib.for	0905 Civil Engineering
utslib.for	0915 Interdisciplinary Engineering
utslib.for	1202 Building
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	in_progress	*
dc.date.updated	2022-08-16T01:35:49Z
pubs.publication-status	Published
pubs.volume	155

Abstract:

This paper investigates seismic collapse potential of a hybrid cold-formed hot-rolled system in order to quantify the response modification factor (R-factor) through a procedural method proposed in FEMA-P695. A series of hot-rolled steel (HRS) knee-braced frames in conjunction with cold-formed steel (CFS) stud walls are proposed to resist lateral and gravity loads. ASCE7-16 does not provide seismic performance factors for this hybrid HRS/CFS structural topology in lightweight steel construction and as a result, more sophisticated assessment is needed to measure reasonable seismic performance. A nonlinear numerical model that simulates post-peak response of HRS knee-braced frames is calibrated with experimental data. Post-buckling behaviour of CFS studs are measured according to various techniques in terms of finite strip method (FSM), finite element method (FEM) and AISI-S136-16 analytical formulations. The modelling approach is implemented into nonlinear analytical models of a six-storey steel building which is designed in accordance with ASCE7-16, ANSI/AISC360-16, and AISI-S316-16. A suite of twenty-two bidirectional far-field ground motions are chosen from PEER/NGA database subset and scaled to conditional mean spectrum (CMS) relevant to Urban California region. A set of nonlinear static analysis as well as incremental dynamic analysis (IDA) is conducted to measure collapse fragility and seismic performance of the building. It is concluded that initially assumed R-factor for the proposed structural system maintains the collapse prevention criterion as recommended by FEMA-P695 and is appropriate to be considered for design purposes.

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http://hdl.handle.net/10453/160290