Bolted and welded connectors for the rehabilitation of composite beams

Pathirana, SW; Uy, B; Mirza, O; Zhu, X

Bolted and welded connectors for the rehabilitation of composite beams

Pathirana, SW Uy, B Mirza, O Zhu, X

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Constructional Steel Research, 2016, 125, pp. 61-73
Issue Date:: 2016-10-01

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Field	Value	Language
dc.contributor.author	Pathirana, SW
dc.contributor.author	Uy, B
dc.contributor.author	Mirza, O
dc.contributor.author	Zhu, X https://orcid.org/0000-0001-5083-9320
dc.date.accessioned	2022-02-23T21:10:52Z
dc.date.available	2022-02-23T21:10:52Z
dc.date.issued	2016-10-01
dc.identifier.citation	Journal of Constructional Steel Research, 2016, 125, pp. 61-73
dc.identifier.issn	0143-974X
dc.identifier.issn	1873-5983
dc.identifier.uri	http://hdl.handle.net/10453/154818
dc.description.abstract	Recent research studies revealed that blind-bolts can be used to strengthen existing composite steel-concrete beams more efficiently and effectively than welded stud connectors. In the general retrofitting operation procedure, the holes created in the concrete slab of composite beams to fix shear connectors are finally backfilled with grout. However, it is clear from a review of the open literature that very few studies have been conducted on the behaviour of shear connectors in grout in retrofitted composite beams. This paper investigates the load-slip behaviour of blind-bolt and welded stud connectors in grout under retrofitted conditions both experimentally and numerically. A series of push-out test experiments was carried out based on the Eurocode 4. The behaviour of retrofitted push-out test specimens during the testing was simulated using Finite Element (FE) models. The concrete and grout properties were modelled by specifying damage criteria using the concrete damage plasticity (CDP) option available in ABAQUS. The effects of height:diameter ratio of the connectors and grout strength on the shear capacity of blind-bolt and welded stud connectors were verified using parametric FE analyses. A modified design equation was proposed to estimate the ultimate shear capacity of bolted connectors in grout. The shear connector properties such as shear resistance, stiffness, ductility and failure modes have been compared and discussed in detail by using the experimental and FE results. These results provide an extended understanding of the feasibility of utilising blind-bolts for retrofitting substandard composite beams.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Journal of Constructional Steel Research
dc.relation.isbasedon	10.1016/j.jcsr.2016.06.003
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0915 Interdisciplinary Engineering, 1202 Building
dc.subject.classification	Civil Engineering
dc.title	Bolted and welded connectors for the rehabilitation of composite beams
dc.type	Journal Article
utslib.citation.volume	125
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	closed_access	*
dc.date.updated	2022-02-23T21:10:50Z
pubs.publication-status	Published
pubs.volume	125

Abstract:

Recent research studies revealed that blind-bolts can be used to strengthen existing composite steel-concrete beams more efficiently and effectively than welded stud connectors. In the general retrofitting operation procedure, the holes created in the concrete slab of composite beams to fix shear connectors are finally backfilled with grout. However, it is clear from a review of the open literature that very few studies have been conducted on the behaviour of shear connectors in grout in retrofitted composite beams. This paper investigates the load-slip behaviour of blind-bolt and welded stud connectors in grout under retrofitted conditions both experimentally and numerically. A series of push-out test experiments was carried out based on the Eurocode 4. The behaviour of retrofitted push-out test specimens during the testing was simulated using Finite Element (FE) models. The concrete and grout properties were modelled by specifying damage criteria using the concrete damage plasticity (CDP) option available in ABAQUS. The effects of height:diameter ratio of the connectors and grout strength on the shear capacity of blind-bolt and welded stud connectors were verified using parametric FE analyses. A modified design equation was proposed to estimate the ultimate shear capacity of bolted connectors in grout. The shear connector properties such as shear resistance, stiffness, ductility and failure modes have been compared and discussed in detail by using the experimental and FE results. These results provide an extended understanding of the feasibility of utilising blind-bolts for retrofitting substandard composite beams.

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http://hdl.handle.net/10453/154818