Keywords :
circular economy; composite structures; demountable composite beam; demountable shear connectors; experimental tests; Beam tests; Circular economy; Composite beam; Composites structures; Demountable composite beam; Demountable shear connector; Experimental test; Large-scales; Shear connector; Shear studs; Civil and Structural Engineering; Building and Construction; Mechanics of Materials; Metals and Alloys
Abstract :
[en] The circular economy approach has been introduced to the construction sector to design out waste, reduce carbon emissions and energy use in production of primary materials and achieve resource efficiency. ‘Design for deconstruction’ is increasingly important for a sustainable economy, especially for composite structure that is deemed as resource-efficient in the first cycle of use. With this background, research has been conducted to facilitate the use of demountable composite beams in steel-framed structures. This article presents the results of two 6 m full-scale composite beam tests with prefabricated composite slabs. Demountable shear connectors were used, which have been newly developed within the frame of an EU project. The nominal degree of shear connection of the composite beam specimens was 0.37, which was slightly below the required 0.4 specified in EN1994-1-1 for welded shear studs. Based on the experimental observations, it can be demonstrated that (1) the tested demountable composite beam produced higher resistance but lower stiffness values than a comparable reference composite beam with welded shear studs; (2) the beam specimens showed a good plastic behaviour with high ductility despite the non-ductile nature of the applied demountable shear connectors. Remarks on the demountability of the developed demountable composite beams are provided.
Funding text :
The research leading to these results is a part of a common project of the Steel Construction Institute LBG, University of Luxembourg, University of Bradford, Lindab S. A., Tata Steel IJmuiden BV, Stichting Bouwen met Staal, Delft University of Technology and AEC3 LTD. The project was supported by the Research Fund for Coal and Steel [grant no. 710040, 2016].Among the aforementioned pieces of research work, the project REDUCE (funded by the Research Fund for Coal and Steel (RFCS) of the European Commission) [ 15 ] has provided a holistic approach and guidance on the design for deconstruction of steel‐concrete composite structures in commercial and residential buildings. A respective design guidance on the demountable composite construction systems for UK practice [ 16 ] has been published based on the findings of REDUCE. One objective of the research work was to assess the composite action of the newly developed demountable shear connectors in push‐out and full‐scale beam tests, observe the modes of failure and obtain the respective structural behaviour at ultimate limit state. The demountable shear connection also allows for the replacement of bolts, should any bolt be damaged. Two experimental tests on full‐scale demountable composite beams are presented. Remarks on the demountability of the system are also provided.The research leading to these results is a part of a common project of the Steel Construction Institute LBG, University of Luxembourg, University of Bradford, Lindab S. A., Tata Steel IJmuiden BV, Stichting Bouwen met Staal, Delft University of Technology and AEC3 LTD. The project was supported by the Research Fund for Coal and Steel [grant no. 710040, 2016].
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