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See detailNumerical simulation of the load bearing behaviour of concrete dowels in slim-floor construction – CoSFB
Braun, Matthias Volker UL; Obiala, Renata UL; Odenbreit, Christoph UL

in Eurosteel 2017 (2017, September 13)

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 ... [more ▼]

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. [less ▲]

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See detailDevelopment of a new push test for Eurocode 4
Hicks, Stephen; Ciutina, Adrian; Odenbreit, Christoph UL

in 8th International Conference on Composite Construction in Steel and Concrete (2017, July 30)

The standard push test specimen in the current version of Eurocode 4 does not provide any information on what modifications should be made when profiled steel sheeting is introduced. Whilst the lack of ... [more ▼]

The standard push test specimen in the current version of Eurocode 4 does not provide any information on what modifications should be made when profiled steel sheeting is introduced. Whilst the lack of information was intended to encourage innovation, this has sometimes lead to test results implying that stud connectors possess a lower resistance and ductility than assumed in current Standards. From full-scale beam and companion push tests in Europe, it has been shown that modifying the push test through the introduction of a normal force to the face of the test slabs provides comparable load-slip performance to that encountered within a beam. Within the work programme for developing the second generation of Eurocodes, this paper presents part of the background to Sub-task 1 of SC4.T3, whose aim is to develop an improved push test for Eurocode 4 when stud connectors are welded within profiled steel sheeting. [less ▲]

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See detailSilicone sealants: A Finite Fracture Mechanics failure model for non-linear materials
Rosendahl, Philipp L.; Staudt, Yves UL; Odenbreit, Christoph UL et al

in 14th International Conference on Fracture (ICF 14) (2017, June)

A finite fracture mechanics failure model for hyperelastic silicone sealants is presented. The model is in very good agreement with simple shear tests of different adhesive joint geometries.

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See detailServiceability performance of steel–concrete composite beams
Lawson, R.Mark; Lam, Dennis; Eleftherios, Aggelopoulos et al

in Proceedings of the Institution of Civil Engineers : Structures and Buildings (2017), 170(2), 98--114

The use of steel–concrete composite beams in which wide-flanged steel beams act compositely with a concrete or steel–concrete composite slab above is well established in building construction. However ... [more ▼]

The use of steel–concrete composite beams in which wide-flanged steel beams act compositely with a concrete or steel–concrete composite slab above is well established in building construction. However, for composite beams with low degrees of shear connection between the beam and slab, significant additional deflections can occur due to slip in the shear connectors. A design formula is presented for the effective stiffness of composite beams taking account of the stiffness of the shear connectors, which is compared to measured deflections of six symmetric composite beams and an 11 m span composite beam of asymmetric profile. It is shown that... [less ▲]

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See detailMechanical model to predict the resistance of the shear connection in composite beams with deep steel decking
Odenbreit, Christoph UL; Nellinger, Sebastian UL

in Steel Construction (2017), 10(3), 248-253

The resistance of a typical shear connection with headed shear studs in a composite beam is analysed for the normal case in accordance with EN 1994-1-1. The reducing effect of a trapezoidal metal decking ... [more ▼]

The resistance of a typical shear connection with headed shear studs in a composite beam is analysed for the normal case in accordance with EN 1994-1-1. The reducing effect of a trapezoidal metal decking to the ultimate loadbearing capacity is considered with empirically derived reduction factors and equations that were developed between the late 1970s and early 1980s. The RFCS research project ”DISCCO“ investigated the shear stud resistance with novel types of steel decking. In many cases, the shear resistance predicted by EN 1994-1-1 was not reached in tests. In the respective experiments with composite beams and deep decking, a concrete cone failure mode was identified and not a pure shear failure of the stud. This failure mode acted in combination with the loadbearing capacity of the shear stud, which formed one or two plastic hinges in the shaft depending on the actual geometry. Based on these observations, new equations have been developed to predict the shear connection's resistance with more accuracy. The yield hinge mechanism of the shear stud, which was developed by Lungershausen, was extended by the aforementioned loadbearing component ”concrete cone“. The formulae consider the geometry of the stud and the steel decking and the material strength of the stud and the concrete. The statistical evaluation of the equations developed demonstrates good agreement with test results. [less ▲]

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See detailDesign of single-span beams for SLS and ULS using semi-continuous beam-to-column joints. Part 2: Composite beams with variable bending stiffness and joints according to EN 1993-1-8
Duarte Da Costa, Job UL; Braun, Matthias Volker UL; Obiala, Renata UL et al

in Steel Construction (2017), 10(2),

The objective of this article is to facilitate the use of semi-continuous joints by providing ready-to-use tables and charts for design, which also permit the benefits accruing from the use of semi ... [more ▼]

The objective of this article is to facilitate the use of semi-continuous joints by providing ready-to-use tables and charts for design, which also permit the benefits accruing from the use of semi-continuous composite beams to be directly identified. The relevant features for the design of composite beams, such as bending moment distribution, maximum deflection and natural frequency, are derived analytically. The influence of semi-continuous steel joints on the performance of single-span composite beams is analysed. The article concludes with an example of the use of a new slim-floor beam type – the composite slim-floor beam (CoSFB). The tables and charts derived are applied in this example with the intention of demonstrating the advantages of using semi-continuous joints in combination with composite beams. The present article extends the design of semi-continuous steel beams presented in the previous article on this subject. [less ▲]

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See detailInfluence of transverse loading onto push-out tests with deep steel decking
Nellinger, Sebastian UL; Odenbreit, Christoph UL; Obiala, Renata UL et al

in Journal of Constructional Steel Research (2017), 128

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 ... [more ▼]

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. [less ▲]

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See detailShort-span composite beam tests to evaluate stud resistances
Nellinger, Sebastian UL; Eggert, Florian; Kuhlmann, Ulrike et al

in Proceedings of the Institution of Civil Engineers. Structures and Buildings (2017)

The results of a parametric study on ten short-span composite beam tests with small degrees of shear connection between 12 and 46% are presented. The beam tests were conducted using composite slabs with ... [more ▼]

The results of a parametric study on ten short-span composite beam tests with small degrees of shear connection between 12 and 46% are presented. The beam tests were conducted using composite slabs with two modern forms of profiled steel sheeting. Important parameters of the shear connection, such as stud diameter, number of studs per rib, reinforcement pattern, welding procedure and concrete strength, were varied. All the test configurations were selected in accordance with a previously conducted study on the behaviour of shear connectors in push-out specimens. A comparison of the bending resistance of the beam tests and the calculated plastic bending resistance is presented. The shear connector resistances were taken either from the push-out test results or from the analytical methods of Konrad, EN 1994-1-1 and Nellinger. Evaluation of the push-out and beam test results showed that the current shear connector resistances in EN 1994-1-1 insufficiently predict the observed concrete failure modes and resistances in the presence of modern forms of steel decking. New approaches to the shear connector resistance proposed by Konrad and Nellinger led to more accurate predictions of the shear resistance of headed studs and the plastic bending resistance of the composite beam tests. [less ▲]

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See detailShear Connections in Composite Flexural Members of Steel and Concrete
Leskelä, M.; Aribert, J-M.; Ciutina, A. et al

Report (2017)

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See detailNumerical simulation and Identification of the Failure Criterion for Structural Silicone
Staudt, Yves UL; Odenbreit, Christoph UL; Schneider, Jens

Speeches/Talks (2016)

In civil engineering, silicone sealants are widely used in structural sealant glazing applications as an adhesively bonded connection between the glass panels and the building substructure. The current ... [more ▼]

In civil engineering, silicone sealants are widely used in structural sealant glazing applications as an adhesively bonded connection between the glass panels and the building substructure. The current design concept does not take into account the actual stress state and the actual failure mechanism. Therefore, no information about the exact failure probability can be given. Alternative approaches, such as the Finite Element Analysis, also have major disadvantages due to the presence of singularities. Therefore, a method from Finite Fracture Mechanics, calibrated with experimental investigations on bulk material, is applied on silicone sealants, focusing on the shear failure mechanism. The procedure is validated using small scale tests such as simple shear and torsion tests. [less ▲]

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See detailMultiCoSteel – Structural Behaviour of Heavy Composite Columns with Multiple Encased Steel Profiles for High Rise Buildings
Chrzanowski, Maciej UL; Odenbreit, Christoph UL

Speeches/Talks (2016)

The PhD resesarch project“MultiCoSteel” is foussed on the investigation of the beam theory for composite columns with multiple encased steel profiles to find the correct internal stress distributions and ... [more ▼]

The PhD resesarch project“MultiCoSteel” is foussed on the investigation of the beam theory for composite columns with multiple encased steel profiles to find the correct internal stress distributions and stiffnesses. The suitability of the Euler-Bernoulli Theory will be investigated as well as the truss theory and the Vierendeel theory. A complex interaction between steel and concrete materials and lack of knowledge regarding composite behaviour opens opportunities to develop, improve and optimise the system and the design method. Within this research project both aspects will be handled with the objectives; 1) to develop the new, easy-applicable and efficient type of shear connector for an application in composite columns with multiple-encased steel profiles and 2) to prove the design hypothesis of Vierendeel mechanism behaviour. The project is running with close collaboration of industrial partner - ArcelorMittal and it was successfully qualified to the FNR AFR-PPP PhD Grant. [less ▲]

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See detailInvestigation of Bonded Connections with Silicone under Shear Loading
Staudt, Yves UL; Odenbreit, Christoph UL; Schneider, Jens

in Bos, Freek; Louter, Christian; Belis, Jan (Eds.) Challenging Glass 5 - Conference on Architectural and Structural Applications of Glass, Ghent, 16 & 17 June 2016 (2016, June 16)

In façade applications, structural sealant glazing systems with a soft adhesive like silicones show a number of advantages especially regarding brittle adherends like glass sheets, as stress ... [more ▼]

In façade applications, structural sealant glazing systems with a soft adhesive like silicones show a number of advantages especially regarding brittle adherends like glass sheets, as stress concentrations in the adherends are avoided due to the large bonding area and the uniform load transfer. The application guideline for structural sealant glazing systems (European Technical Application Guideline ETAG 002) defines a simplified design concept for the silicone sealant, leading to high safety factors and restrictions in use. The material behaviour of the silicone sealant can be more accurately described using the Finite Element Method and hyperelastic material laws, but the results for the stresses at the edge area for a shear dominated loading are highly mesh dependent, due to the presence of a singularity and thus hampering the assessment of the realistic stress distribution. In this paper, shear tests on bonded connections with silicone, referring to the ETAG 002, are presented. Beside the overlap length and adhesive thickness of the specimen prescribed by the standard, two more overlap lengths and thicknesses are tested. For the experimental investigations, the force-deformation behaviour and the failure initiation, observed at the edge area, are recorded. Unlike for the adhesive length, an influence of the specimen thickness on the failure shear strain could be observed and predicted by the numerical simulations. A clear difference between the maximum load and the load at failure initiation was observed. [less ▲]

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See detailInvestigation of hybrid steel-glass beams with adhesive silicone shear connection
Odenbreit, Christoph UL; Dias, Vincent UL

in Steel Construction (2016), 9(3), 207-221

Glass is used in current construction applications mostly as a façade element, its structural role being only rarely exploited, despite its significant resistance to in-plane compression. A steel-glass ... [more ▼]

Glass is used in current construction applications mostly as a façade element, its structural role being only rarely exploited, despite its significant resistance to in-plane compression. A steel-glass composite beam was built to investigate a hybrid steel-glass assembly and its loadbearing behaviour. To fulfil this objective, the existing types of steel-glass connection were evaluated, which allowed the possibilities offered by adhesive jointing to be highlighted. The selection of the adhesive, detailed in the present article, constituted a crucial aspect. An excessively soft connection does not transfer the shear loads between the glass and steel adherends, whereas an excessively stiff connection leads to failure of the glass. A two-component structural silicone was chosen and its properties were assessed with the help of an intensive test programme. As a result of this programme, a new quasi-incompressible hyperelastic material law was developed in order to represent the silicone elastomer behaviour. Numerical simulations were conducted in parallel to large-scale four-point bending tests on the adhesively bonded steel-glass composite beams. The aims were, on the one hand, to assess the bending stiffness of the steel-glass composite beam and, on the other, to validate the numerical simulations to conduct parametric studies. [less ▲]

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See detailDesign of single span beams in SLS and ULS using semi-continuous beam-to-column joints - Part 1: Beams with constant bending stiffness and joints according to EN 1993-1-8
Braun, Matthias Volker UL; Duarte Da Costa, Job UL; Obiala, Renata UL et al

in Steel Construction (2016), 9(1), 1-15

This article explains a method for determining how semi-continuous joints influence the deflection, natural frequency and bending moment distribution of single-span beams with constant inertia under ... [more ▼]

This article explains a method for determining how semi-continuous joints influence the deflection, natural frequency and bending moment distribution of single-span beams with constant inertia under uniformly distributed load. The method is adequate for simple hand calculations, allowing the structural engineer to assess potential savings already in the pre-design phase. Further, the economical potential of semi-continuous joints according to EN 1993-1-8 is demonstrated by an application example. [less ▲]

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See detailPush out test of novel deep steel decking-failure modes and influence of transversal loading
Odenbreit, Christoph UL; Obiala, Renata; Nellinger, Sebastian et al

in Association for Steel-Concrete Composite Structures (2015, December 03)

This paper presents the results of push-out test specimens on shear connectors for composite beams, which are placed centrally in the ribs of novel formed deep steel decking. These deck shapes have not ... [more ▼]

This paper presents the results of push-out test specimens on shear connectors for composite beams, which are placed centrally in the ribs of novel formed deep steel decking. These deck shapes have not been well considered in the development and the calibration studies of EN 1994-1-1. The presented tests have been designed to investigate the additional failure modes and the corresponding load-slip behaviour, with special consideration of the newly occurring failure modes in the rib. In addition, the vertical loading of the slab has been considered in the push-out tests by a transverse load, acting with the help of a supplementary hydraulic jack. The differences between a concentric and eccentric transverse loading and a constant and variable transverse loading was investigated in the test series. [less ▲]

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See detailEarly-Stage Assessment for Office Buildings concerning thermal comfort , energy efficiency amd sustainabilty
Degens, Anja UL; Scholzen, Frank UL; Odenbreit, Christoph UL

in 14th International Building Simulation Conference BS 2015 (2015, December)

The building facade greatly influences energy demand, internal comfort and environmental quality of office buildings. This paper shows the influence of relevant design parameters for highly glazed systems ... [more ▼]

The building facade greatly influences energy demand, internal comfort and environmental quality of office buildings. This paper shows the influence of relevant design parameters for highly glazed systems. In detail constructive and technical measures have been evalutated to optimise light weight composite and solid structures in European climate. The structure type and the glazing share indeed have some influence on the energetic and thermal behaviour of the building but the influence of the ventilation strategy is significantly higher. However, in case of an adequate ventilation strategy, the structure type becomes more decisive if a thermal optimisation, especially a reduction of the over-heating risk, shall be achieved. [less ▲]

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See detailHigh Rise Buildings in Steel - from Past to Present
Odenbreit, Christoph UL

in Infosteel (2015, November 10)

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See detailAnalyses of the loadbearing behaviour of deep-embedded concrete dowels, CoSFB
Braun, Matthias; Obiala, Renata UL; Odenbreit, Christoph UL

in Steel Construction (2015), 8(3), 167-173

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 ... [more ▼]

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. [less ▲]

Detailed reference viewed: 145 (20 UL)