Push-out tests on demountable shear connectors of steel-concrete composite structures

Andras Kozma, Christoph Odenbreit, Matthias Volker Braun, Milan Veljkovic, Martin Nijgh

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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The deconstruction of steel-concrete composite structures in buildings and the later separation of the materials is a labour- and cost intensive work. The shear studs are welded on the steel beam and imbedded in the concrete deck and a large amount of cutting work becomes necessary. As a result, recycling is difficult and the potential for reusing entire elements is lost. The carbon footprint of composite structures could be decreased by application of the principles of “design for deconstruction and reuse”.

This paper presents a desk top study and corresponding laboratory experiments on demountable shear connectors that facilitate recyclability and even provide the potential for reusing complete structural elements. In the Laboratory of Steel and Composite Structures of the University of Luxembourg 15 push-out tests have been carried out using different bolted connection systems suitable for multiple uses in order to verify their performance focusing on shear strength, stiffness, slip capacity, ductility and ability of demounting. The investigated systems included pre-stressed and epoxy resin injection bolts, solid slabs and composite slabs with profiled decking. The results showed that the tested demountable shear connections could provide higher shear resistance than conventional shear connections.

The critical failure mode is shear failure of the bolts, while there was no visible damage observed on the connected members. Most of the tested connections could fulfil the ductility requirement according to by Eurocode 4. The application of epoxy resin in the hole clearance resulted in lower slip capacity. The outcome provides an important basis for the justification of the forthcoming enhancement and validation of numerical models of the demountable shear connections.

The failure behaviour, the observed damages and the resulting ability of the elements for re-use are discussed in detail.
Original languageEnglish
Title of host publicationProceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018
EditorsV. Albero, A. Espinos, C. Ibabez, A. Lapuebla, M.L. Romero
Place of PublicationValencia
PublisherUniversitat Politecnica de Valencia
Number of pages8
ISBN (Print)978-84-9048-601-6
Publication statusPublished - 29 Jun 2018
Event12th International Conference on Advances in Steel-Concrete Composite Structures - València, Spain
Duration: 27 Jun 201829 Jun 2018
Conference number: 12


Conference12th International Conference on Advances in Steel-Concrete Composite Structures
Abbreviated titleASCCS 2018
Internet address


  • Demountable shear connectors
  • push-out tests
  • metal decking
  • circular economy
  • shear capacity
  • experimental study


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