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See detailDesign of point fitted insulating glass units
Tibolt, Mike UL

Doctoral thesis (2015)

Today’s building façades are not imaginable without the building material glass. Modern architects capitalise the transparency and the load carrying capacity of glass elements in the design of filigree ... [more ▼]

Today’s building façades are not imaginable without the building material glass. Modern architects capitalise the transparency and the load carrying capacity of glass elements in the design of filigree and light-flooded structures. Priority is thereby given to the maximal transparency and the energy efficiency of the glass façade. In fact, the strategy paper “EU 2020” formulated by the European Union has an important impact on the design of glass façade and the energy efficiency will be a focal point in the design of glass façades in future. The optimal combination of transparency and energy efficiency is achieved by using point fitted insulation glass units. Their application in glass façades becomes therefore indispensable in the future. <br />Currently, three different point fitting systems for point fitted insulation glass units exist. They however present several disadvantages concerning their installation procedure and the tightness of the glazing cavity. Additionally, a general design concept for point fitted insulation glass does currently not exist. In consequence, point fitted insulation glass is a non-regulated construction product and requires an approval in individual cases from the national building authorities. <br />A model to proof the structural integrity of a developed point fitted insulation glass unit with a suitable point fitting system and edge seal system is proposed. A state of the art investigation reveals the Fischer undercut anchor to be the most suitable type for the application in insulation glass. A novel design concept for point fitted insulation glass with undercut anchors is developed. The concept considers the determination of the climate loads and proposes a verification procedure for each structural element of the insulation glass unit. For this purpose, an existing climate load model for linearly supported insulation glass is analytically extended to the static system of point fitted insulation glass units with undercut anchors. For the verification of the connection undercut anchor in glass, an existing design method for point fitted single and laminated glazing is extended to point fitted insulation glass. Component tests are conducted on the Fischer anchor and its ultimate load bearing capacity in glass is determined. A calibrated numerical model of the proposed point fitted insulation glass unit with the Fischer anchor is developed for parametric studies. Large scale tests on the proposed new point fitted insulation glass unit are run with the aim to verify the numerical model, the climate load model and the extended design method and to proof the structural integrity of the entire unit. Finally a new point fitted insulation glass unit with a suitable point fitting type and a corresponding novel design concept is developed. [less ▲]

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See detailThe stress peak at the borehole of point-fitted IGU with undercut anchors
Tibolt, Mike UL; Odenbreit, Christoph UL

in Journal of Facade Design and Engineering (2015), 2(1-2), 33-66

The highest transparency in glass facades is obtained with point fitted glass units. Point fitted insulating glass units minimize thermal bridging and lead to glass facades with better energy efficiency ... [more ▼]

The highest transparency in glass facades is obtained with point fitted glass units. Point fitted insulating glass units minimize thermal bridging and lead to glass facades with better energy efficiency. Though, insufficient knowledge is present to offer a design method for point fittings in insulating glass. Therefore research has been carried out to extend the existing SLG-design-method (Linear superposition of local and global stress components) of Beyer for point fitted single and laminated glass to insulation glass units. This paper presents the first results of this research campaign. Load bearing tests on point fittings in single glazing have been conducted. A finite element model of the point fitting is calibrated by strain comparison. A test campaign for the deviation of a material law for silicone, used as secondary sealant in the edge seal system, is presented. The verified FE-model is implemented in a selected insulation glass unit, and the influence of the edge distance of the point fitting, as well as the edge bond stiffness and geometry on the stress peak at the borehole is investigated. In addition, the size of the so called ‘local area’ is adjusted for insulation glass units. [less ▲]

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See detailAnalytical extension of a climate load model for undercut point fitted IGU
Tibolt, Mike UL; Hechler, Oliver UL; Odenbreit, Christoph UL

in Louter, Christian; Bos, Freek; Belis, Jan (Eds.) et al Challenging Glass 4 & COST Action TU0905 Final Conference (2014)

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See detailExperimental investigations and numerical modeling of point-fitted glass panes
Tibolt, Mike UL; Odenbreit, Christoph UL; Hechler, Oliver UL

in ICSA2013 - Conference book (2013, July)

The highest transparency of façades is to be obtained by the use of point-fitted glass units. To comply with the demand for energy efficiency the use of insulating glass units is required. However ... [more ▼]

The highest transparency of façades is to be obtained by the use of point-fitted glass units. To comply with the demand for energy efficiency the use of insulating glass units is required. However, insufficient knowledge is present for point fittings in insulating glass which is a drawback of this kind of construction. Therefore research has been carried out to extend an existing design-method, the SLG-method, to insulating glass. In this paper, first, experimental investigations in point-fitted single glass units and the results are presented. Secondly, a numerical model is introduced which has been calibrated to this test data. This model will subsequently be extended to other geometries and the stress peaks at the borehole as well as the size of the local area for the SLG-method will be determined. Therefore this paper presents the preparation process for the application of the SLG-method for insulation glass units. [less ▲]

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See detailNumerical investigation of insulation glass units with undercut point fittings
Tibolt, Mike UL; Odenbreit, Christoph UL; Hechler, Oliver UL

in European COST Action TU0905 - Book (2013, April)

The highest transparency in glass façades is obtained with point fitted glass units. Point fitted insulating glass units minimize thermal bridging and lead to glass façades with better energy efficiency ... [more ▼]

The highest transparency in glass façades is obtained with point fitted glass units. Point fitted insulating glass units minimize thermal bridging and lead to glass façades with better energy efficiency. Though, insufficient knowledge is present to offer a design method for point fittings in insulating glass. Therefore research has been carried out to extend the existing SLG-design-method of Beyer for point fitted single and laminated glass to insulation glass units. This paper presents first results of this research campaign. Load bearing tests on point fittings in single glazing have been conducted. An FEA-model of the point fitting is calibrated by the test data according to the method of Kasper. By means of this verified FEA-model, the influence on the stress peak at the borehole of the edge distance of the point fitting as well as the edge bond is investigated. In addition, the size of the so called “local area” is adjusted for insulation glass units. [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 ▲]

Detailed reference viewed: 145 (18 UL)