Research projects

Some research projects

REDUCE: Reuse and Demountability Using Steel Structures and the Circular Economy

The project will provide methodologies, tools and guidance to assist in design for deconstruction, particularly of composite steel structures for multi-storey buildings. This will lead to new shear connection systems for demountable composite construction, based on push tests and beam tests to verify composite action and to develop design rules. The whole life benefits of reusable structures will be quantified using LCA and circular economy indicators. Opportunities for greater standardisation and the use of BIM will be explored to facilitate deconstruction. A demonstration of demountability of the developed system is planned. Guidance on design for deconstruction and reuse will be prepared. The research is a common project of Steel Construction Institute, University of Luxembourg, University of Bradford, Lindab, Tata Steel, Bouwen met Staal, Delft University of Technology and AEC3.

Funded by the European Comission’s Research Fund for Coal and Steel
Research Assistant: András KOZMA
Ongoing (07.2016 – 07.2020)

---

SRCon2: Requirements on the Rotation Capacity of Semi-Continuous Composite Joints

Since linear elastic analysis of continuous composite beams results in high hogging moments at supports and low sagging moments at mid-span, EN 1994-1-1 allows for a certain amount of redistribution of moments provided that the joints are rigid and full-strength, and ignores semi-continuous beams altogether. On the other hand, a plastic analysis is only allowed when the joints possess sufficient rotation capacity. But no practical analytical method is given to evaluate neither the rotation capacity nor the required rotation. EN1994-1-1, Section 8.3.1 (2) indicates only that “... The rotation capacity of a composite joint may be demonstrated by experimental evidence.”
In this research project, using the results from experimental test campaigns and numerical simulations, the aim is to capture the fully nonlinear behavior of composite beams and joints realistically with the target is to propose a method, representing this behavior that gives reliable estimation of the needed values for plastic analysis of beams and joints, i.e. deflections at mid-span, rotation at the joint, and distribution of stiffness, shear, and moment along the beam.

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Ali AZIM AZARY
Ongoing (01.2019 - present)

---

SRCon: Semi-Rigid, Partial-Strength Composite Connections with Composite Slim Floor Beams

In this research project experimental test campaign comprising eight full-scale beam-to-column joints with composite slim-floor beams was executed, accompanied with finite element simulations with the software Abaqus to investigate in-depth the conducted experiments and to analyse the behaviour of additional composite joints with different reinforcement properties. In the end, an analytical model was developed to calculate the rotation capacity of composite joints is derived, which offers an improvement of the current design rules for the joints.

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Job Duarte DA COSTA
05.2014 – 04.2018

PhD-Thesis: Structural properties of steel-concrete composite joints
URL:http://orbilu.uni.lu/handle/10993/36322

---

ShearCon: Identification of the shear connection failure mechanism in modern composite beams

Because of their empirical nature, current design rules of EN 1994-1-1 for the prediction of the shear capacity of the headed stud shear connectors with profiled steel sheeting deliver unsafe results, especially for modern geometries of the decking. The project ShearCON is aimed at identifying and understanding the mechanical behaviour of the aforementioned shear connectors in order to provide a clear overview of the load-bearing mechanisms with the support of experimental tests (push-out tests), numerical and analytical models.

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Valentino VIGNERI
Ongoing (02.2017 – Present)

---

COMINO: Development of an innovative U-shaped steel-concrete composite beam solution: Experimental and numerical studies

An innovative solution of steel-concrete composite beam was developed taking into consideration the fire situation and the construction stage. The beam is composed of a U-shaped steel part connected to a reinforced concrete part. The U-shaped beam withstands the construction loads without any temporary propping system. When casting concrete, the steel beam is filled at the same time as the slab, this allows considerable time savings on site. In exploitation stage, the beam behaves as a steel-concrete composite beam. The connection between the two materials is made by welded headed studs on the lower part of the U-shaped beam. In fire situations, the composite beam satisfies conventional fire stability durations due to the longitudinal reinforcements inside the concrete downstand part with sufficient covers. Two experimental tests were carried out at the Laboratory of the University of Luxembourg; one with the steel beam only to show the lateral torsional buckling of the beam and a second with the steel-concrete composite beam to characterize its mechanical behaviour. Analytical methods of design based on EN 1993 and EN 1994 were proposed. Numerical models were validated with the tests and simulations were performed with different geometries to validate the analytical methods of design.

Funded by CIFRE, France in combination with CTICM, Paris and Université de Lorraine
Prof. Abdenhouad Khelil ; Research Assistant: Maxime TURETTA
Ongoing (09.2016 - 10.2019)

---

MultiCoSteel: Shear Transfer in Heavy Steel Concrete Composite Columns with Multiple Encased Steel Profiles

The project is dealing with the shear transfer in heavy steel-concrete composite columns with multiple encased steel profiles. In the conducted research, a focus was placed on two aspects of shear transfer: (1) local shear transfer at the steel-concrete interface and (2) global shear transfer between the embedded steel profiles. With reference to the current practice, gaps in the knowledge and in the available solutions have been identified. A complex interaction between the materials and lack of knowledge regarding composite behaviour in columns with multiple encased steel profiles opens opportunities to develop novel systems and design methods. The described objectives are investigated experimentally and by the FE numerical simulations. As an outcome, an analytical model for the resistance of the developed novel shear connectors and innovative mechanical engineering model for the description of the structural behaviour, as well as effective stiffness, of a composite member with more than one embedded steel profile are given.

Funded by the Fonds National de la Recherche Luxembourg
Research Assistant: Maciej CHRZANOWSKI
07.2015 – 07.2019

PhD-Thesis: Shear Transfer in Heavy Steel Concrete Composite Columns with Multiple Encased Steel Profiles
URL:http://orbilu.uni.lu/handle/10993/40011

---

CoSFB: Investigation of the Load-Bearing Behaviour of CoSFB-Dowels

A CoSFB-Dowel is an innovative shear connector for steel-concrete composite slim-floor beams. It consists of circular openings drilled in the web of the steel secton with reinforcement bars passing through and filled with normal concrete in-situ. This research projects focused on the identification of parameters influencing the load-bearing behavior in general and on parameters contributing to the load-bearing capacity of CoSFB-Dowels in detail.
Detailed analysis of Push-out test results along with finite element simulations led to an improved understanding of the overall load-bearing behaviour. Using the numerical model to identify and evaluate components contributing to stiffness and strength, a mechanical model with an analytical method was developed to evaluate the load-bearing capacity of CoSFB-Dowels.

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Matthias Volker BRAUN
2014 - 2018

PhD-Thesis: Investigation of the Load-Bearing Behavior of CoSFB-Dowels
URL: http://orbilu.uni.lu/handle/10993/36873

--- 

IsoFix: Life-cycle design of point-fitted insulation glass units

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Yves STAUDT
01.2014 – 01.2017

PhD-Thesis: Proposal of a Failure Criterion of Adhesively Bonded Connections with Silicone
URL:http://orbilu.uni.lu/handle/10993/34392

--- 

DISCCO: Development of Improved Shear Connection Rules in Composite Beams. New design rules for shear connector resistance in composite beams with deep rolled sheeting for resource efficient construction.

Funded by the RFCS
Research Assistant: Sebastian NELLINGER
07.2012 – 06.2015

PhD-Thesis: On the behaviour of shear stud connections in composite beams with deep decking
URL: http://orbilu.uni.lu/handle/10993/24468

--- 

IsoPoint2Steel: New, innovative discrete connections between insulating glass and steel for energy efficient building envelopes

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Mike TIBOLT
02.2011 - 01.2014

PhD-Thesis: Design of point fitted insulating glass units
URL: http://orbilu.uni.lu/handle/10993/20829

 

--- 

COSIGLASS: Development of an Adhesive Constitutive Material Law for the Assessment of the Load bearing Behaviour of Partial Bonded Composite Steel Glass Beams

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Vincent DIAS
12.2009 – 11.2013

PhD-Thesis: Development of adhesives constitutive material laws for the assessment of bonded steel to glass partial composite beams
URL: http://orbilu.uni.lu/handle/10993/12399

--- 

RELING: Identification of Material Thermal Stress Strain Behaviour for Simulation of Conditions in Reactors

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: David RODRIGUES
03.2007 – 02.2011

PhD-Thesis: Identification of material thermal stress-strain behaviour for simulation of conditions in metallurgical reactors
URL: http://orbilu.uni.lu/handle/10993/15625

--- 

NUSI: Numerical Simulation and Development of a Simplified Analysis Model for Semi-Rigid, Partial-Strength Composite Connections in Steel- and Concrete

Funded by the ArcelorMittal Chair of Steel Construction
Research Assistant: Christoph HAHN
12.2005 – 11.2009

PhD-Thesis: Zur Rotationskapazität von Verbundanschlüssen bei der Bemessung nach dem Fließgelenkverfahren
URL: http://orbilu.uni.lu/handle/10993/15666

---

OPTIMISED ANCHOR PLATES: Optimised Anchor Plates in Steel- and Composite Constructions with Regard to Construction Management and Load Bearing Capacity

Funded by the Fonds National de la Recherche Luxembourg
Research Assistant: Stephan FROMKNECHT
05.2005 – 04.2009

PhD-Thesis: Contribution to the Load-Bearing Capacity of Anchor Plates with Headed Studs in Reinforced Concrete Columns
URL: http://orbilu.uni.lu/handle/10993/15560