Analyses of the loadbearing behaviour of deep-embedded concrete dowels, CoSFB

The development of the “CoSFB-Betondübel” is presented in this paper. The “CoSFB-Betondübel” is a deep-embedded concrete dowel connecting in situ concrete with a steel section to assure composite action and thus allow for composite beam design. The loadbearing behaviour and parameters influencing this behaviour were determined through experimental tests. Special focus was given to the influence of the ratio of the resistance of the concrete dowel to the concrete compression class. The evaluation of the results concluded in a National Technical Approval [1]. Further investigations were performed via FE analysis in ABAQUS. Further, 3D models with non-linear material and geometry were prepared and validation undertaken. In addition, a real application example of CoSFB is shown

Development of an innovative type of shear connector dedicated to fully embedded steel-concrete composite columns – experimental and numerical investigations

[EN] A shear connection in steel-concrete composite columns is established in the normal case with headed shear studs. However, this type of connector was developed for composite beams and in terms of composite columns, a wide range for an optimisation still can be identified due to the different geometries of steel profiles, concrete and reinforcement. The presented paper shows investigations on a new type of shear connector with a direct application to composite columns and with a potential for a fully automatic fabrication process. The proposed new type of shear connection is made out of reinforcement bars welded to the external surfaces of the steel profile’s flanges. The experimental campaign consisted of 12 composite push-out tests with a column section geometry. The analysed specimens included centrally embedded HEB120 steel profiles into 340x1000x450mm concrete blocks. All the tests have been categorized into 4 groups. One group per connector was defined (including group without mechanical connector). Each group had 3 identical specimens. Surface treatment conditions, reinforcement arrangement, used materials and test layout were the same in all executed tests. The acquired results showed a good performance of the proposed solutions and allowed to identify the different load-bearing behaviour. After the test execution, the specimens were opened and the failure pattern have been investigated. The testing campaign was supported by numerical simulations performed with the finite element software code Abaqus®. In the developed models, a new approach to simulate the steel-concrete bond was implemented.The MultiCoSteel research project is running in a collaboration with the industrial partner ArcelorMittal. It is funded by the National Research Fund, Luxembourg, FNR AFR-PPP PhD Grant (Call 2016-1), Proj. Ref. 11283614. Numerical experiments presented in this paper were carried out using the HPC facilities of the University of Luxembourg – http://hpc.uni.lu.Chrzanowski, M.; Odenbreit, C.; Obiala, R.; Bogdan, T.; Braun, M.; Degee, H. (2018). Development of an innovative type of shear connector dedicated to fully embedded steel-concrete composite columns – experimental and numerical investigations. En Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018. Editorial Universitat Politècnica de València. 427-434. https://doi.org/10.4995/ASCCS2018.2018.6970OCS42743

Influence of transverse loading onto push-out tests with deep steel decking

This paper presents the results of 20 push-out tests on shear stud connectors, placed centrally in the ribs of 58 mm and 80 mm deep steel decking. The tests were designed to investigate the realistic load–slip behaviour of the shear connectors and the influence of transverse loading. The tests considered two different stud diameters and the effect of concentric and eccentric transverse loading. In addition, the influence of a second layer of reinforcement, thewelding procedure and the number of shear connectors in each rib have been considered. The observed influence of these parameters on the load–slip behaviour is presented and explained with regard to material properties and load-bearing models. In addition, the test results are compared with the current analytical approaches,which are shown to be non-conservative in some cases, because the presented deck shapeswere not well considered in the development and calibration of EN 1994-1-1

Design for disassembling, reuse, and the circular economy: a demonstration building, “Petite Maison”. (LAC23.B3)

peer reviewedAbstractFor sustainability purposes, steel reuse at the material, structural element, and structure levels has been proposed and encouraged in recent years. Designing for deconstruction or disassembly is identified as one key strategy. A recent RFCS (Research Fund for Coal and Steel) project – REDUCE – has investigated the methodology and opportunities to design and facilitate the reuse of composite structures in steel frames. Furthermore, a demonstration building – the Pavilion “Petite Maison” – has been constructed using the solutions developed within REDUCE. The “Petite Maison” is located in Esch‐sur‐Alzette, Luxembourg, and it contributes to Esch2022, European Capital of Culture, by promoting circularity, reuse, and sustainability. It is open to public visits and is planned to be deconstructed with elements being tracked for reuse. This paper presents the design concept of the structural system of the “Petite Maison”, proposals of standard and modular elements and kits, and the analyzing methods for adaptable steel connections and demountable shear connections that are applied in the system

Geometric decomposition tools for parallel computing

Abstract unavailable please refer to PD

Numerical simulation of the load bearing behaviour of concrete dowels in slim-floor construction – CoSFB

In this paper the current status of an ongoing research on composite slim-floor beams (SFB) with concrete dowels (CoSFB) is presented, Fig. 1. Using commercial software ABAQUS [1], a 3D solid model with non-linear material laws has been developed to simulate the load bearing behaviour of concrete dowels numerically. The model was validated by the results of experimental investigations, which have proven a high stiffness of the concrete dowels under service loads and their ductile behaviour in reaching the load bearing resistance [2], [3]. Further, in comparison to traditional shear studs, the thickness of the concrete cover above the upper flange of composite SFB with concrete dowels can be reduced to a minimum, which leads to an optimized floor thickness and overall to a more economic construction. Main parameters defining the FE model, which influence the load bearing capacity, the behaviour and failure of the shear connection were identified and described in this paper. Available results and analysis from the parametric study are described. Wide range of results obtained from the numerical study will be used to derive an analytical model to allow predicting the load bearing resistance of the system