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Lange G.,Deutsches Institute For Bautechnik
3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings | Year: 2010

EOTA Technical Report TR 0201 is the technical basis for assessment of metal anchors in concrete under fire exposure for European technical approvals. The current version of 2004 offers a simplified design method based on experience and an experimental determination of resistance under fire exposure. After 5 years of experience with application of TR 020, suggestions arise for the amendment of TR 020. The prequalification of resistance under fire exposure is restricted to anchorages which are qualified for cracked concrete. The reliability of anchors for use in cracked concrete is checked in tests with 1000 crack movements. It should be checked if anchors which are not qualified in these crack movement tests can also be used under fire exposure. Therefore, currently the cracks in concrete due to fire should be investigated and compared with bending cracks. It is assumed that cracking under fire exposure is mostly caused by moisture within the concrete. Dense concrete of high strength is sensitive to spalling and micro-cracking of the member. The aim of the investigation is to compare the behaviour of anchors under bending cracks and cracks caused by fire. For post-installed rebars with injection systems no harmonised regulations of determination for the fire resistance classes exist. Expert's reports based on different methods are presented by manufacturers. DIBt is preparing a proposal for a harmonised assessment of post-installed rebars under fire exposure for European technical approvals.


Misiek T.,Karlsruhe Institute of Technology | Kruger H.,Karlsruhe Institute of Technology | Kathage K.,Deutsches Institute For Bautechnik | Ummenhofer T.,Karlsruhe Institute of Technology
Proceedings of SDSS' Rio 2010: International Colloquium Stability and Ductility of Steel Structures | Year: 2010

Trapezoidal sheeting made of stainless steel can be used for applications with high requirements on visual appearance or corrosion resistance. The calculation of the load-bearing capacity of thinwalled structures including trapezoidal sheeting normally follows the procedures of EN 1993-1-3 and similar codes. EN 1993-1-4 complements this standard concerning thin-walled structures made of stainless steel. This standard relies on many publications on thin-walled structures made of stainless steel. But unfortunately these publications almost all focus on thin-walled beams and columns and therefore some topics that are specific to trapezoidal sheeting are not recognized. The results of the presented research results on the load-bearing behaviour of thin-walled trapezoidal sheeting made of stainless steel are closing this gap: With the proposed additions to the existing design formulae, the complete calculation of the load-bearing capacity of trapezoidal sheeting made of stainless steel is possible. © (2010) by COPPE - Federal University of Rio de Janeiro All rights reserved.


Misiek T.,Karlsruhe Institute of Technology | Kapplein S.,Karlsruhe Institute of Technology | Kathage K.,Deutsches Institute For Bautechnik
Proceedings of SDSS' Rio 2010: International Colloquium Stability and Ductility of Steel Structures | Year: 2010

Fixings of different thin-walled building components differ in load-bearing behaviour and loadbearing capacity, even if identical screw fasteners are used. This is most pronounced for fixings under tensile loading. In this case, the differences are caused by the differences in geometry and material properties of the thin-walled building components, leading to differences in local deformation behaviour and therefore local stressing. We discuss the influence of parameters such as geometry and material on load-bearing behaviour and pull-trough resistance of fixings with screw fasteners. A comparison between the different thin-walled building components is made, also focusing on the difference between sheeting made of steel and made of aluminium. The conclusions of this discussion have to be taken into account when designing test set-ups for the determination of the characteristic resistance values of such connections. A short review of the new ECCS-Recommendations dealing with testing of fixings is done. For thin-walled trapezoidal sheeting and corrugated sheeting design equations can be obtained by evaluating a huge number of test results. These equations are presented and compared with theequations in design codes. For sandwich panels, a equation allowing analysing the influence of material and geometrical parameters on the load-bearing resistance is presented. © (2010) by COPPE - Federal University of Rio de Janeiro All rights reserved.


Stranghoner N.,University of Duisburg - Essen | Schiborr M.,University of Duisburg - Essen | Glienke R.,Fraunhofer Anwendungszentrum Grossstrukturen in der Produktionstechnik | Wanner M.-C.,Fraunhofer Anwendungszentrum Grossstrukturen in der Produktionstechnik | Ulbrich D.,Deutsches Institute For Bautechnik
Stahlbau | Year: 2013

Slip-resistant connections in steel structures permit bolted connections with low slip and deformation, which are mainly used in structures, in which deformations of the connections would limit the serviceability of the structures. Typical applications can be found in radio masts, bridges and towers of wind turbines, which are loaded by fatigue. Essential characteristics of these connections are the slip factor and the preload in the bolts. The new execution standard for steel structures, DIN EN 1090-2, provides in contrast to DIN 18800-7 the possibility of considering different surface treatments by various classes and with Annex G, it provides a detailed test method to determine the slip factor taking into account possible creep effects. The differences in the testing methodology in comparison to the TL/TP-KOR- Stahlbauten are in the details and can lead to unfavourable slip factors. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Ulbrich D.,Deutsches Institute For Bautechnik | Primke-Engel R.,Ingenieurburo Primke Engel | Blunk C.,Fraunhofer Anwendungszentrum Grossstrukturen in der Produktionstechnik | Glienke R.,Fraunhofer Anwendungszentrum Grossstrukturen in der Produktionstechnik
Stahlbau | Year: 2013

Mechanical joints in metallic light weight structures. Construction is not possible without joining single parts to components and at the end to the final structure. There exist multifarious kinds of connections whose suitability mainly depends on the characteristic of raw material the structural parts are made of. This article especially deals with joints in metallic light weight structures. Beside the typical connections in metal structures like welding, bolting and riveting in metallic light weight structures further kinds of connections can be found like standing seam, clinch, punch rivet or cartridge fired pin connections. Describing all these single methods would go beyond the scope of this article. That is why only the predominant part of all connections with so called pencil-shaped fastening elements like screwed connections, blind riveted connections and connections with cartridge fired pins will be dealt with. Furthermore the scope of application will be shown, advantages and disadvantages will be compared, the determination of characteristic values or resistance will be shortly explained and advices for calculation and execution will be given. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Kathage K.,Deutsches Institute For Bautechnik | Feldmann M.,RWTH Aachen | Kopp M.,RWTH Aachen | Pak D.,RWTH Aachen | And 5 more authors.
Composite Construction in Steel and Concrete VII - Proceedings of the 2013 International Conference on Composite Construction in Steel and Concrete | Year: 2013

Composite dowels are known as powerful shear connectors in steel-concrete-composite girders. More and more they are used in practice especially for prefabricated composite bridges. Advantages over headed studs are in particular the increased strength, the sufficient deformation capacity even in high strength concrete and the simple application in steel sections without upper flange. However, missing provisions in standards for composite dowels with the economic clothoid and puzzle shape have led to retentions of clients and delays in the approval process. Hence, the aim of the recently finished German research project P804 founded by FOSTA-Research Association for Steel Application was to solve open questions concerning these innovative shear connectors and to prepare a general technical approval available for any design office and construction company. In this paper design concepts for ultimate limit state and fatigue limit state, structural design principles and instructions for production and construction are presented and background information are given. © ASCE.


Breitschaft G.,Deutsches Institute For Bautechnik
Bauingenieur | Year: 2011

The Eurocodes are a comprehensive set of standards for the design in the field of construction on which work has been performed for over thirty years throughout Europe. In their current version the Eurocodes consist of 58 standard parts. Regarding these Eurocode parts 41 National Annexes have been completed at present, so that now the Eurocodes can be released by the building authorities for application at least to a limited extent. Even if some National Annexes to the latest European standards are still missing, work is already carried out at European level on the next generation of these Eurocodes. In this connection the German side wants to for in particular a better user-friendliness of this nevertheless very extensive set of standards.


Adhesive bonding as a kind of joining method is wellestablished in many industrial sectors. Custom-designed different methods were developed to proof structural safety and serviceability of adhesive bonded constructions. Especially in vehicle manufacturing huge progresses were made in the last few decades. But applying methods of vehicle manufacturing on construction sector results in difficulties and seems to be unproductive. In construction sector it is practice to produce prototypes based on calculational proof in a short period of time. Costs for complex FE analyses and prototype testing are hard to calculate so this approach is seldom used. If the wish exists to intensify the use of adhesive bonded joints in steel construction proofing methods are to be developed for promising applications. In this paper it will be shown on two examples in the field of façade construction, that there are possibilities for a simplified calculational proof of adhesive bonded joints in steel construction. Subject matter are adhesive bonded joints for trapezoidal sheet façades and reinforced rectangular hollow profiles to be used as mullion profiles in mullion-transom-façades.

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