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See detailEnergy performance assessment of an existing double-skin façade: measurements and simulation
Carton, Julien UL; Scholzen, Frank UL; Thomas, Sébastien et al

in Energy Forum - Solar Building Skins, 06 - 07 December 2012, Italy (2012, December)

An existing office building with an active double skin façade in Luxembourg has been analyzed. In the first step in-situ measurements have been performed. For this purpose outside, inside and cavity ... [more ▼]

An existing office building with an active double skin façade in Luxembourg has been analyzed. In the first step in-situ measurements have been performed. For this purpose outside, inside and cavity conditions have been measured for representative summer and winter conditions. In a second step, a thermal simulation using TRNSYS was performed. The simulation model has been compared to the time limited series of measurements and thus has been validated for some of the annual meteorological conditions. Then the model has been extrapolated to a whole year in order to assess the energy performance of the given façade. Further a parametric study of alternative façades has been carried out based on the validated simulation model to assess their own performances. For the given case study building, the double skin concept energetically performs well compared to other concepts with non outside (non weather exposed) solar protection, but worse than an external solar protection. The thermal comfort level in the rooms has also been determined by simulation - the calculated room averaged comfort level is quite optimal, but further investigations regarding the local comfort close to the glazed façades still have to be achieved. [less ▲]

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See detailDevelopment of material law for silicone to simulate structural adhesive connections
Dias, Vincent UL; Odenbreit, Christoph UL; Hechler, Oliver UL et al

in Jens Schneider, Bernhard Weller (Ed.) Engineered Transparency Handbook (2012, October)

Recently developed adhesive materials enable the transfer of high loads between glass and other materials for structural use. However, for a numerical simulation, the description of the non-linear ... [more ▼]

Recently developed adhesive materials enable the transfer of high loads between glass and other materials for structural use. However, for a numerical simulation, the description of the non-linear behaviour of the adhesives must still be improved. Therefore extensive experimental investigations have been carried out on a structural elastomer and a material constitutive model has been derived based on the experimental results. Via numerical studies, the new constitutive model has been validated and assessed by comparison to test data and existing models. [less ▲]

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See detailDetermination of Adhesives Properties for Non-linear Numerical Simulation of Structural Steel-Glass Connections
Dias, Vincent UL; Odenbreit, Christoph UL; Hechler, Oliver UL

in Bos, Louter, Nijsse, Veer (Ed.) Handbook of the Challenging Glass 3 conference (2012, June)

In the construction of façades, connections between glass and glass as well as other materials with varying properties, e.g. metals, are currently designed with, inter alia, the application of adhesives ... [more ▼]

In the construction of façades, connections between glass and glass as well as other materials with varying properties, e.g. metals, are currently designed with, inter alia, the application of adhesives. The related analytical evaluation of the load bearing characteristics of these kinds of assemblies requires the correct determination of the adhesives’ properties; knowledge in this field is still incomplete. Therefore an extensive test campaign on the load bearing and displacement behaviour of common structural silicone and UV-acrylic was carried out with the aim, to identify appropriate models to describe their properties under quasi-static loading and for their implementation in numerical analyses. The test program, comparisons between the different adhesive materials and a summarised outcome will be presented in this paper. [less ▲]

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See detailDesign concept for point fitting of insulation glass units
Hechler, Oliver UL; Tibolt, Mike UL; Odenbreit, Christoph UL et al

in VI International Congress on Architectural Envelopes - Book (2012, June)

The façade significantly influences the energy efficiency of the building. However, in addition to high insulating properties, modern architecture demands a high transparency for natural illumination and ... [more ▼]

The façade significantly influences the energy efficiency of the building. However, in addition to high insulating properties, modern architecture demands a high transparency for natural illumination and the compliance with inner comfort criteria in the building. The increasing use of glass can be seen as the architectural intention to combine those well-being and energetic principles. The highest transparency can be achieved with point-fitted glass units. Though, insufficient knowledge is present to use point fittings for insulation glass units, which are required to comply with the demand for energy-efficiency. Therefore, research has been carried out to investigate in the load bearing mechanism of different point-fitted insulating glass units in order to find an innovative point fitting connection system for insulating glass units to the steel substructures. This paper presents results of this research campaign and provides information on how to design point-fitted insulating glass units. [less ▲]

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See detailInvestigations into the Safety Level of Marine Steel Sheet Pile Structures with Consideration of Corrosion
Odenbreit, Christoph UL; Osório, Paulo; Van Baars, Stefan UL et al

in Proceedings of the 20th Australasian Coastal and Ocean Engineering Conference 2011 and the 13th Australasian Port and Harbour Conference 2011 (2011, October)

In this paper, several reliability analyses of a sheet pile wall in a marine environment were performed, in which the influence of a wide range of corrosion models was assessed. The influence of the ... [more ▼]

In this paper, several reliability analyses of a sheet pile wall in a marine environment were performed, in which the influence of a wide range of corrosion models was assessed. The influence of the corrosion was compared in structures with different conditions (two different sheet pile profiles were used, as well as two values of the sheet pile length and also two different values of the surcharge). To perform the reliability analyses, the First Order Reliability Method (FORM) was used and reliability analyses were performed using a combination of different programs. The effect that the variation of the coefficient of variation v of the probability distributions has on the measured level of safety is not linear. For certain ranges of v, the influence on the safety level is not very significant, whereas in other ranges it causes an abrupt reduction of the safety, meaning that access to data of thickness loss due to corrosion of good quality (that represent reality as accurately as possible) is very important to avoid erroneous conclusions about the safety. [less ▲]

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See detailFailure Probability of Marine Steel Sheet Pile Structures with Special Consideration of the Corrosion Impact
Osório, Paulo; Odenbreit, Christoph UL; Van Baars, Stefan et al

in OCEANS 2011 IEEE - Spain (2011, June 06)

In this paper, several reliability analyses of a sheet pile wall in a marine environment were performed, in which the influence of a wide range of corrosion models on its safety was assessed. The First ... [more ▼]

In this paper, several reliability analyses of a sheet pile wall in a marine environment were performed, in which the influence of a wide range of corrosion models on its safety was assessed. The First Order Reliability Method (FORM) was used and the reliability analyses were performed using a combination of different programs. The effect that the variation of the coefficient of variation CoV of the probability distributions has on the measured level of safety is not linear. For certain ranges of CoV, the influence on the safety level is not very significant, whereas in other ranges it causes an abrupt reduction of the safety, meaning that the access to good quality data of the corrosion-rate is important to avoid erroneous conclusions about the safety. A design procedure to include the effect of corrosion in the safety of the structure was also developed. [less ▲]

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See detailCorrosion effects onto the safety of steel sheet pile walls in marine environment
Osório, P.; Odenbreit, Christoph UL; Greger, M. et al

Scientific Conference (2011)

Corrosion of steel sheet piles in marine environment is a highly complex phenomenon, with a high degree of uncertainty associated. The present model for prediction of corrosion in the Eurocodes (EN 1993-5 ... [more ▼]

Corrosion of steel sheet piles in marine environment is a highly complex phenomenon, with a high degree of uncertainty associated. The present model for prediction of corrosion in the Eurocodes (EN 1993-5), defines zones of different aggressiveness, and suggests values that depend on the temporal horizon of the structure. However, the model is made to be applied to any structure in marine environment, independently of the specific conditions that may be present in each case. This paper shows results of the application of a new multi-factorial model to predict corrosion to two sheet pile walls designed according to the Eurocodes in two different scenarios. The results show that in one of the situations, the level of safety of the sheet pile is below the acceptable limit of safety given by the Eurocodes. That suggests that the corrosion model of EN 1993-5 must be applied with caution and with knowledge of its limitations. [less ▲]

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See detailDetermination of the material shear strength without shear box brittle bonded material
Rodrigues, D.; Odenbreit, Christoph UL; Greger, M. et al

Scientific Conference (2010, September 06)

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See detailVersuche zur Tragfähigkeit von Ankerplatten mit einbetonierten Kopfbolzendübeln in schmalen Stahlbetonstützen
Fromknecht, Stephan; Odenbreit, Christoph UL; Dorka, Uwe

in Beton- und Stahlbetonbau (2010), 105(6), 362--370

Müssen große Lasten von Stahl‐ in Betonbauteile eingebracht werden, sind Ankerplattendetails mit aufgeschweißten Kopfbolzendübeln oft praktikable Lösungen. Dies gilt auch für die Befestigung von ... [more ▼]

Müssen große Lasten von Stahl‐ in Betonbauteile eingebracht werden, sind Ankerplattendetails mit aufgeschweißten Kopfbolzendübeln oft praktikable Lösungen. Dies gilt auch für die Befestigung von Stahlträgern an Stützen aus Stahlbeton. Hier können die Ankerplatten z. B. bauseits an der Schalung befestigt und mit dem Ortbeton einbetoniert werden. Die Dimensionierung dieser Einbauteile kann, wie auch die Berechnung von nachträglich installierten Befestigungsmitteln, derzeit nach Europäischen Technischen Zulassungen (ETA) erfolgen. Im Unterschied zu nachträglich installierten Befestigungen ist für die Ankerplatte mit einbetonierten Kopfbolzendübeln eine rechnerische Nutzung der Tragfähigkeit der Bewehrung möglich. Allerdings führen die diesbezüglichen Regelungen – im Vergleich zu den in... [less ▲]

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See detailStructural Reliability Analysis of Quay Walls with Steel Sheet Piles
Osório, P. UL; Odenbreit, Christoph UL; Vrouwenvelder, T.

in Reliability Analysis of Quay Walls with Steel Sheet Piles (2010)

This paper shows the first results of the reliability analysis of a steel sheet pile wall located in the Port of Hamburg, North of Germany. The wall was designed according to EAU 2004 and the First Order ... [more ▼]

This paper shows the first results of the reliability analysis of a steel sheet pile wall located in the Port of Hamburg, North of Germany. The wall was designed according to EAU 2004 and the First Order Reliability Moment (FORM) was used to perform the reliability analyses. Blum’s model of interaction soil/structure, which was used in the design of the wall, was also used in the reliability analyses. To have a basis of comparison, another model was used: the sub-grade reaction model, or beam in an elastic foundation model. The results show a fair approximation between both models in the outcome of the reliability analyses. The stochastic properties of the variables were based on the recommendations of the Joint Committee for Structural Safety (JCSS) and corrosion was also included in the analyses through a probabilistic model. The results show that the sheet pile wall has a probability of failure below the limit given by the Eurocode EN 1990 for a service life of 50 years. [less ▲]

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See detailBending Resistant Composite Joints for High Rotation Capacity.
Odenbreit, Christoph UL; Hahn, Ch

in Proceedings of IABSE Conference (2009)

In the last years mixed structures in steel and concrete gain more and more importance. These structures combine the advantages of steel constructions with the advantages of the concrete. The typical slab ... [more ▼]

In the last years mixed structures in steel and concrete gain more and more importance. These structures combine the advantages of steel constructions with the advantages of the concrete. The typical slab construction for those buildings insists in a concrete slab, which is carried by a steel beam. Both elements together result in the composite beam. The composite beam is connected to the column with the composite connection. The presented analysing model is valid for fixed, pinned and even for semi-rigid composite connections. It is related to the model by the study group COST C1. The Model helps to determine computational values for the stiffness, the load-carrying capacities and the rotation ability of composite joints. The model is based on the evaluation of 56 experiments at composite connections. [less ▲]

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See detailUntersuchungen über das Trag-und Dehnungsverhalten des Betongurtes bei Verbundanschlüssen
Odenbreit, Christoph UL; Jaspart, Jean-Pierre; Hahn, Christoph

in Stahlbau (2009), 78(1), 35-41

Due to the rising cost pressures in the construction industry, it is particularly important to choose efficient design methods to achieve economic structures. The use of the plastic hinge theory may lead ... [more ▼]

Due to the rising cost pressures in the construction industry, it is particularly important to choose efficient design methods to achieve economic structures. The use of the plastic hinge theory may lead to good results within the steel and composite construction industry because cross section- and system reserves can almost fully used. This means for the normal composite beam a redistribution of the bending moment from the support section to the field section. This redistribution causes an increase of the rotation at the composite connection. The presented tests show the influence of the reinforcement (type of reinforcement and reinforcement ratio) to the rotation capacity of the connection. The increased rotation requirements of composite connections in the area of plastic hinges should already be take in to account at planning state. [less ▲]

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See detailLoad-Deformation Behaviour of Shear Studs in Fatigue Loading at Mid-Lifetime
Odenbreit, Christoph UL

in Reliability, safety and diagnostics of transport structures and means 2008 (2008, September 25)

The behaviour of headed shear studs in fatigue loading in composite steel- and concrete constructions is presented. In contrast to the traditional way to conduct fatigue tests in a force-controlled manner ... [more ▼]

The behaviour of headed shear studs in fatigue loading in composite steel- and concrete constructions is presented. In contrast to the traditional way to conduct fatigue tests in a force-controlled manner, the tests have been conducted displacement-controlled. The evaluation of the test data with the Ramberg-Osgood equation allowed the creation of a shear force – slip amplitude diagram and its separation into an ‘elastic’ and a ‘plastic’ part for the long-term and the short-term behaviour. This diagram can be used to model the load-deformation behaviour of the shear studs in fatigue loading in composite bridges. [less ▲]

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See detailRamberg Osgood and Manson Coffin Relation for shear studs in fatigue loading
Odenbreit, Christoph UL

in 7th International Conference on Steel Bridges (2008)

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See detailImprovement of Load Bearing Capacity in Design of Anchor Plates with Headed Shear Studs in Concrete Columns
Odenbreit, Christoph UL; Fromknecht, Stephan

in 2nd International Symposium on Connections between Steel and Concrete (2007)

A typical constructional solution for load bearing elements at the intersection between steel and concrete in high-rise- as well as multi-storey-buildings is the anchor plate in steel. Tests on the ... [more ▼]

A typical constructional solution for load bearing elements at the intersection between steel and concrete in high-rise- as well as multi-storey-buildings is the anchor plate in steel. Tests on the positive effects of reinforcement in constructions with small edge distances such as columns and wall edges show that the design solutions still can be improved compared to the regulations in technical approvals. The ambition of this research is the determination of the load flux between anchor plate, concrete and reinforcement, improved design and use of shear/tension hanger reinforcement, reduction of allowable edge distances and increase of allowable load in combination with reinforcement. Tests with different topologies of anchor plates and concrete structures were conducted. Explored are the ultimate forces in correlation to edge distance, anchorage reinforcement and load eccentricity. These forces are compared to ultimate allowable forces which are calculated according to current technical approvals for headed studs. [less ▲]

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See detailAspects of Steel Structures in Marine Environment including Corrosion Using Eurocode 3 and National Annex
Oke, Ashwini; Odenbreit, Christoph UL

in Aspects of Steel Structures in Marine Environment including Corrosion Using Eurocode 3 and National Annex (2007)

Steel structures in the marine environment like Steel Sheet Pile walls at quays and harbors, undergo continuous corrosion subjected to prolong sea water environment. The design of these steel structures ... [more ▼]

Steel structures in the marine environment like Steel Sheet Pile walls at quays and harbors, undergo continuous corrosion subjected to prolong sea water environment. The design of these steel structures currently is been practiced by using respective national annexure in alliance with the Eurocodes. But the correct statistical properties which fit into the semi-probabilistic safety concept of the Eurocodes still have to be determined. Steel Sheet pile retaining walls will obligatorily be analyzed according to the Eurocodes on and after the year 2010 [1]. Eurocodes 1 and 3 for load assumptions and structural steel design are introduced to various countries by building authorities even now. The work on Eurocodes 1997-1:2004 has been recently completed; to focus on the harmonization of all the national annexures and an economical design of steel sheet piles must guaranteed remain. The current paper highlights mainly upon the difference in the design aspects with special consideration to the usage of partial safety factor dealt in the Eurocodes, versus using initial practice of the respective national annexure and various geotechnical factors affecting the same. Analytical examples of typical cross sections of sheet piles will be evaluated using annexure and in conjunction with Eurocode and FEM packages. [less ▲]

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See detailManson-Coffin- and Ramberg-Osgood relation for headed shear studs in fatigue loading
Odenbreit, Christoph UL; Dorka, Uwe

in Improving Infrastructure Worldwide (2007)

Welded shear studs in composite bridges are subjected to statical as well as fatigue loading. To proof the fatigue resistance, the so-called Wöhler curves (S-N curves) have been established. The slip ... [more ▼]

Welded shear studs in composite bridges are subjected to statical as well as fatigue loading. To proof the fatigue resistance, the so-called Wöhler curves (S-N curves) have been established. The slip displacements in these bridges between concrete slab and steel girder however show that, the loading on the studs is more displacement than force controlled. Results on displacement-controlled fatigue push-out tests on shear studs are presented to describe the correlation between slip and bearable load cycles with the Manson-Coffin equation and the correlation between shear forces and slip with the Ramberg-Osgood equation. Both relations are combined to obtain an assessment of internal forces as well as displacements for the verification of the fatigue resistance. [less ▲]

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See detailCorrelation between stiffness of composite connections and adjacent composite beam
Odenbreit, Christoph UL; Hahn, Christoph

in 2nd International Symposium on Connections between Steel and Concrete (2007)

In the last years composite structures got more and more important for office as well as high rise buildings. Many test programs where started to study the load bearing behavior of these structures. This ... [more ▼]

In the last years composite structures got more and more important for office as well as high rise buildings. Many test programs where started to study the load bearing behavior of these structures. This paper concentrates on the stiffness behaviour of composite connections, the connecting link between beams or column and beam. The presented analysing model aims in determining the stiffness of composite connections in a practical manner. Therefore a new variable – the non-dimensional spring stiffness – is introduced. The non-dimensional stiffness is a characteristic value for one kind of composite connections, for example joints with endplates or joints with fins. The determination of the non-dimensional stiffness is based on the evaluation of 59 test results. [less ▲]

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See detailOptimised Anchor Plates
Dorka, U.; Fromknecht, S.; Maas, S. et al

Presentation (2007)

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