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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Trautz, Martin; Herkrath, Ralf; Puppa, Giovanni Della; Buffart, Henry Tragverhalten von plattenartigen Tragelementen mit ein- und mehrlagigen Faltungen aus Feinblech Stahlbau 3/2013 208-213 Fachthemen

Kurzfassung

Der Einsatz von Feinblech für tragende Konstruktionen im Bauwesen ist bisher weniger weit verbreitet und beschränkt sich in Form von Halbzeugen auf Well- oder Falzbleche oder auf Sonderbauweisen wie etwa geodätische Kuppeln, hemisphärische, in Anlehnung an Polyedergeometrien gefaltete Hüllen aus dünnem Blech. Neben solchen räumlich gekrümmten Faltkonstruktionen, deren Lastabtragung - ähnlich Schalentragwerken - überwiegend über Normalkraftbeanspruchung erfolgt, sind auch biegebelastete Tragwerke aus gefalteten dünnen Blechen in Kombination mit ebenen Blechen in einer oder in mehreren Lagen als Leichtbaukonstruktion denkbar. Entscheidend für die Effizienz in Bezug auf das Tragverhalten solcher so genannter Faltleichtbauplatten ist einerseits die Wahl der Faltungstypologie und Faltungsausbildung hinsichtlich Faltungshöhe und -frequenz, andererseits die Wahl der Blechdicke. Letztere hängt von der lokalen Beulgefahr und den Spannungen ab. Um das statisch nutzbare Potential solcher biegebeanspruchter Tragelemente aus Feinblech auszuloten, werden im vorliegenden Artikel die Ergebnisse von Untersuchungen im Rahmen einer Parameterstudie an ein- und mehrlagigen Longitudinal- und Punktfaltungen auf ihre auf das Eigengewicht bezogene Tragfähigkeit vorgestellt, Konstruktionsgrundsätze abgeleitet und Einsatzmöglichkeiten aufgezeigt.

Load-bearing characteristics of plate-like elements with single and multi-layered folded structures of steel sheets.
The application of steel sheet for load-bearing constructions is currently rather uncommon. Nowadays, steel sheet for load-bearing constructions is only used for corrugated sheeting or for special constructions such as geodesic domes; hemispherical, folded envelopes made out of thin steel sheet that have been invented by the architect R. Buckminster Fuller. Beside these spatially-curved folding constructions, whose load is mainly transferred by axial force, bearing structures composed out of thin, folded sheets with one or more layers as a light-weight structure are also possible. Crucial for their load bearing behavior and their efficiency is on the one hand the choice of the folding typology regarding folding height and frequency and on the other hand the sheet thickness, which depends on the local load factor. The present article shows the potential of bending-loaded bearing structures by presenting the results of parametric studies. In the context of these parametric studies, single- and multi-layered longitudinal foldings and point foldings made of steel sheet have been examined towards their bearing capacity. Construction principles as well as potential uses have also been perused.

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Chen, Weizhen; Yang, Guang Theory and case study of vehicle load identification based on BWIM of steel truss bridge Stahlbau 3/2013 214-222 Berichte

Kurzfassung

In China recent accidents involving sudden collapses of bridges have aroused great concern about real traffic loads and the loadbearing capacities of existing bridges. However, the proper management of such bridges relies on accurate information on bridge operating loads, which is essential for assessing correctly the operation and safety of bridges. Therefore, this paper proposes an integrated load identification system for operating traffic which is based on the characteristics of a steel truss bridge, i.e. the finite distribution of stress influence lines of suspender and orthotropic steel deck, and employs the BWIM (bridge weigh-in-motion) technique to establish the functional relationship between vehicle load and stress history as well as the functional relationship between axle load and stress history.
To verify the system, a stress monitoring case study was carried out on two steel truss bridges under both controlled and normal traffic conditions. In the case of controlled traffic, monitored information is used to back-calculate vehicle load and axle load. The load information is then compared with a synchronous video recording of the traffic to check back-calculated data about vehicle weight, vehicle speed, wheel weight and the deviation between lateral distribution and actual condition, coupling the relationship between vehicle load and corresponding axle load in order to assure the validity of the identification system established. In the case of normal traffic, monitored stress data are used to back-calculate vehicle load, axle load, vehicle speed and wheel lateral distribution, which are further analysed to work out a probability distribution so that it can directly help assess the real load capacity and fatigue life of the bridges.

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Stahlindustrie kritisiert Verknappung der CO²-Zertifikate Stahlbau 3/2013 222 Aktuell

Kurzfassung

Keine Kurzfassung verfügbar.

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Rubin, Helmut Lösung und Gewinner der Weihnachtspreisaufgabe 2012 Stahlbau 3/2013 223-226 Weihnachtspreisaufgabe

Kurzfassung

Keine Kurzfassung verfügbar.

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Schubart, Ralf; Frickel, Jörg Hartmut Meyer 75 Jahre Stahlbau 3/2013 227 Persönliches

Kurzfassung

Keine Kurzfassung verfügbar.

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Kurrer, Karl-Eugen Ignaz Gridl. Eisenkonstruktionen. Ingenieurbaukunst und Innovation im späten 19. Jahrhundert. Fotografien von Nora Schoeller. Von Fogarassy, A. Stahlbau 3/2013 228-229 Rezensionen

Kurzfassung

Keine Kurzfassung verfügbar.

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Berner, Klaus; Pfaff , Ute; Raabe, Oliver Photovoltaikelemente auf bestehenden Sandwichdachelementen - Einfaches Bemessungskonzept für Punktlasten. Von Naujoks, B., Zapfe, C. Stahlbau 3/2013 229-230 Zuschriften

Kurzfassung

Keine Kurzfassung verfügbar.

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Termine: Stahlbau 3/2013 Stahlbau 3/2013 230 Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 3/2013 Steel Construction 3/2013 Content

Kurzfassung

Keine Kurzfassung verfügbar.

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Ummenhofer, Thomas Offshore wind energy - Challenging new techniques Steel Construction 3/2013 177 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Scharff, Rüdiger; Siems, Michael Pushing the limits - mega monopile foundations for offshore wind turbines Steel Construction 3/2013 178-185 Articles

Kurzfassung

Offshore wind energy development is lagging far behind the ambitious targets that the German government set at a time when an energy turnaround was propounded. Interest in using monopile foundations in a wider field is therefore growing because this type of foundation has proved to be the most economical solution. Their benefits lie in their simple design, favourable fabrication conditions with a considerable automation potential, and short installation times. Concepts and technologies are being developed to be able to produce and install monopile foundations for water depths down to at least 40 m. The necessary design concepts have to be adapted and extended for these requirements. Approaches are presented in this paper.

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Steel market outlook 2013/2014 Steel Construction 3/2013 185 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Thieme, Andreas; Schröter, Falko Modern heavy steel plates for use in offshore installations - characteristics and production processes Steel Construction 3/2013 186-190 Articles

Kurzfassung

Steels for structural applications for offshore oil and gas as well as offshore wind installations have to fulfil demanding requirements that exceed those for steels used in normal structural steelwork. The applicable steel grades must show an optimum trade-off between sufficient toughness and good strength properties, and at the same time allow easy fabrication, especially concerning weldability. Although sufficient toughness is of importance in order to avoid abrupt failure phenomena such as brittle fracture, good strength properties are necessary to minimize the dead weight of the structure and thus facilitate transport and erection process. The significance of good fabrication properties consist of two facets: good weldability results in easy processing procedures and thus cost-efficiency in fabrication; further, materials with good weldability exhibit a higher resistance to cracking phenomena in the heat affected zone and are therefore more “forgiving” when it comes to non-optimum welding conditions, which may occur during erection in harsh environments.
This steel has to be tailor-made at the steelworks, the aim being to produce it as cleanly as possible with specially adapted alloying concepts. To secure good properties in the half thickness portion of the plates, what is necessary for offshore plates, slabs and ingots have to show an accurate control of the mid thickness segregation. Additionally those plates need higher deformation ratios from slab to plate in order to get a dense structure also in the mid thickness by proper through thickness deformation. These materials are produced with various rolling and heat treatment processes, each chosen depending on the desired grade, thickness and weight of the final plate. The processes in use are normalization of the plates, thermomechanical controlled rolling and the quenching and tempering of the plates.
This article aims to support the designer or fabricator when selecting the steel grade by explaining the different production methods and the resulting properties with respect to the final use.

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Ummenhofer, Thomas; Weidner, Philipp Improvement factors for the design of welded joints subjected to high frequency mechanical impact treatment Steel Construction 3/2013 191-199 Articles

Kurzfassung

The effectiveness of high frequency mechanical impact treatment for increasing the fatigue strength of welded structures has been investigated in several research projects over recent years. Based on extensive fatigue test data, design recommendations have been developed by different institutions. Most recommendations provide fatigue strength improvement factors that consider beneficial effects due to the application of post weld treatment methods. Current design recommendations use fatigue test data derived from small-scale specimens, but only very few studies have focused on welded joints with a plate thickness > 15 mm. This paper reviews existing design recommendations and provides a database for welded joints with a plate thickness exceeding those already covered. Butt-welded joints, longitudinal attachments and transverse attachments are covered in particular. Based on the data evaluated, improvement factors are given for a stress ratio of R = 0.1 for axial loading.

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Baeßler, Matthias; Rücker, Werner; Cuéllar, Pablo; Georgi, Steven; Karabeliov, Krassimire Large-scale testing facility for cyclic axially loaded piles Steel Construction 3/2013 200-206 Articles

Kurzfassung

Offshore piles have to withstand predominantly cyclic axial loads when they are installed in multi-pile configurations, as in jacket foundations. The dimensions of the pile are governed by both the internal capacity and the fatigue behaviour of the steel cross-section as well as by its external capacity in the pile-soil interaction. Owing to the large numbers of piled foundations required for current and future offshore wind farms, there is an urgent need to optimize the dimensions and related costs of single piles. With regard to the pile capacity, two major topics of research are the determination of possible capacity gains due to pile ageing effects and proper consideration of cyclic degradation. In order to investigate both effects, a large-scale testing facility has been constructed at the BAM TTS site in Horstwalde near Berlin. This open-air facility allows large tubular driven piles to be loaded cyclically in both tension and compression while studying the ageing effects by introducing delays between the testing campaigns. First results already show a moderate increase in pile capacity over time. Concerning the anticipated capacity degradation of cyclically loaded piles, preliminary results show an unexpected behaviour. Additional tests are currently being conducted for further clarification.

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Founding of "Gesellschaft für Bautechnikgeschichte" Steel Construction 3/2013 206 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Schmidt, Michael; Fehling, Ekkehard; Braun, Torsten Grouted connections for offshore wind turbine structures, Part 1: Individual approval, materials and quality control Steel Construction 3/2013 207-215 Articles

Kurzfassung

On offshore wind turbine structures, grouted connections are widely used to connect the tower structure to the foundation while accommodating the unavoidable geometrical tolerances effectively. The long-term behaviour of high- and ultra-high-strength grouts primarily depends on the adequate strength and durability of the material plus the process reliability. The performance of the fresh and the hardened grout is influenced by many factors that have to be evaluated and considered individually with respect to the “rough” offshore conditions. Those factors are: mix performance and consistency, the ambient conditions at the place and time of use, the equipment for and stability of the mixing and casting processes, the length of casting time and the thermal and mechanical loads during the early stages. To ensure adequate long-term behaviour, a meaningful quality assurance system should be set up to cover both the materials and the processes. The article emphasises some fundamental experiences gained by the authors with numerous wind turbine parcs in the North Sea and the Baltic Sea.

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Fehling, Ekkehard; Leutbecher, Torsten; Schmidt, Michael; Ismail, Mohammed Grouted connections for offshore wind turbine structures, Part 2: Structural modelling and design of grouted connections Steel Construction 3/2013 216-228 Articles

Kurzfassung

In many cases, the design checks of grouted connections follow international standards which contain analytical design equations. In order to also obey mechanical consistency especially for structures with significant bending moment and to satisfy basic requirements according to the Eurocodes, different mechanical models have been used in practice in a number of cases. In this regard, non-linear finite element models as well as analysis with strut and tie models have been applied. Findings from these calculations as well as from experimental investigations on both the material and the structural level are analysed and compared. In conclusion, an improved design approach based on a strut model which is easy to handle is presented and exemplified.

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Kido, Ewa Maria; Cywinski, Zbigniew The new steel-glass architecture of buildings in Japan Steel Construction 3/2013 229-237 Reports

Kurzfassung

Practical examples of modern architecture in the western hemisphere based on structural compositions of steel and glass have been presented several times in recent years. In doing so, their theoretical background has also been discussed. This paper focuses on the relevant architectural manifestations in Japan. Buildings for commercial and public use are the sole interest here - with special emphasis on the ultramodern character of their design. It is planned to consider infrastructure elements such as railway stations and airport structures in a future article.

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Ernst , Claudia; Brunier , Knut The Design Carport - A self-supporting folded steel sheet structure Steel Construction 3/2013 238-241 Reports

Kurzfassung

In the design and making of complex architectural systems, sheet metal is still predominantly used as a cladding material. The objective here is to integrate innovative digital and analogue methodologies to develop a design system for a self-supporting lightweight structure entirely based on the use of sheet metal as a construction material.
A digital working methodology which is informed by fabrication techniques, material behavior and structural performance allows for a highly precise product and a coherent fabrication process.

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Eilzer, Wolfgang; Jun, Rolf; Angelmaier, Volkhard; Maier, Markus Hans-Peter Andrä reached 65 Steel Construction 3/2013 242-243 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Hovering wings of light in Hamburg are completed Steel Construction 3/2013 243 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Announcement: Steel Construction 3/2013 Steel Construction 3/2013 243 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 3/2013 Steel Construction 3/2013 244-246 ECCS News

Kurzfassung

Events
Announcements
Technical Committees (TC) activities
TC News

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Contents: Structural Concrete 3/2013 Structural Concrete 3/2013 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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