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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Misiek, Thomas; Käpplein, Saskia; Ulbrich, Detlef Selecting materials for fastening screws for metal members and sheeting Steel Construction 1/2013 39-46 Reports

Kurzfassung

This paper deals with the parameters for choosing the materials for fastening screws used in connections involving thin-walled sections and thin sheeting. Different types of corrosion processes and repeated bending due to thermal elongation are identified as the most important parameters; these are explained in detail here. Based on that, some general recommendations for choice of material are given.

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Scharff, Rüdiger; Siems, Michael Monopile foundations for offshore wind turbines - solutions for greater water depths Steel Construction 1/2013 47-53 Reports

Kurzfassung

A study into the feasibility of monopile foundations at sites in the North Sea with water depths as great as 35 m has been carried out in which various options for the geometric configuration and the selection of material were considered. In parameter studies, simplified design methods were applied to assess the effects of the individual load components at the draft design stage. The fatigue limit state becomes more and more relevant as the water depth increases; therefore, dynamic effects must be examined with special care. Turbine concepts with low RNA mass and low rated speed help to achieve the desired design in the soft-stiff regime. As a result, it can be said that monopile foundations with their great manufacturing advantages can be constructed for water depths beyond the current limits of practical experience if the logistical challenges in handling large masses are solved.

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Ziólko, Jerzy; Lesniak, Alojzy Assembly of the steel roof structure for the football stadium in Gdansk Steel Construction 1/2013 54-60 Reports

Kurzfassung

The technology of assembling the roof over the stadium built in Gdan´sk for the EURO 2012 European Football Championship is discussed here. The stadium has a characteristic silhouette - its shape and the colours of the façade resemble a cut block of amber. The steel roof structure has a quasi-elliptical form, with a maximum diameter of 220 m and minimum diameter of 187 m. It is 38 m high and the roof girders extend 48 m over the grandstand below. The roof structure weights 7150 t and was assembled in 226 days.

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Flat Carbon Europe cuts its energy bills with turbine technology Steel Construction 1/2013 60 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Kowalski, Dariusz The aluminium and polycarbonate covering to the roof over the stadium in Gdansk Steel Construction 1/2013 61-66 Report

Kurzfassung

This paper presents information about structural elements of the roof covering to the stadium in Gdan´sk built for the 2012 European Football Championship in Poland and the Ukraine. The paper discusses elements of the polycarbonate covering, the supporting structure and the drainage system. It also provides information about tests and research performed prior to construction, which determined the solutions adopted as well as the roof’s present and future condition.

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Announcement: Steel Construction 1/2013 Steel Construction 1/2013 66 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 1/2013 Steel Construction 1/2013 67-72 ECCS News

Kurzfassung

Conferences
Technical Committees (TC) activities
TC News
Software

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Contents: Structural Concrete 1/2013 Structural Concrete 1/2013 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Annual table of contents 2012 Structural Concrete 1/2013 Annual table of contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Walraven, Joost; Balázs, György L. fib Model Code for Concrete Structures 2010: a landmark in an ongoing development Structural Concrete 1/2013 1-2 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Walraven, Joost fib Model Code for Concrete Structures 2010: mastering challenges and encountering new ones Structural Concrete 1/2013 3-9 Technical Papers

Kurzfassung

The Model Code for Concrete Structures 2010 is a recommendation for the design of structural concrete, written with the intention of giving guidance for future codes. As such, the results of the newest research and development work are used to generate recommendations for structural concrete at the level of the latest state of the art. While carrying out this exercise, areas are inevitably found where information is insufficient, thus inviting further study. This paper begins with a brief introduction to the new expertise and ideas implemented in fib Model Code 2010, followed by a treatment of areas where knowledge appeared to be insufficient or even lacking and where further research might be useful.

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Helland, Steinar Design for service life: implementation of fib Model Code 2010 rules in the operational code ISO 16204 Structural Concrete 1/2013 10-18 Technical Papers

Kurzfassung

CEB/FIP Model Code 1990 (MC-1990) did represent the technology and focus some 20 years ago. However, it soon became evident that the document had some notable lacunas. In 1995 the general assemblies of the two organizations endorsed CEB/FIP bulletin No. 228, extensions to MC 1990 for high-strength concrete, and in 2000 a similar extension to MC 1990 for lightweight aggregate concrete as bulletin No. 4.
The fib approved bulletin No. 34 Model Code for Service Life Design (MC SLD) in 2006. All these three additions have since matured and are now incorporated in the new fib Model Code for Concrete Structures 2010 (MC-2010).
The main purpose of an fib Model Code is to act as a model for operational standards. The obvious counterpart for a body such as fib operating worldwide is ISO. The initiative taken by MC SLD has therefore further matured in ISO TC-71/SC-3/WG-4 and it was accepted as ISO 16204 “Durability - Service Life Design of Concrete Structures” during the summer of 2012.
According to the obligations given in the WTO Agreement on Technical Barriers to Trade, it is hoped that these principles will be further implemented in national and regional standards.
This article describes the need for a transparent methodology when dealing with service life design, and the process - originating from a group of enthusiasts one decade ago - through fib and finally reaching international consensus in ISO.

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Cervenka, Vladimir Reliability-based non-linear analysis according to fib Model Code 2010 Structural Concrete 1/2013 19-28 Technical Papers

Kurzfassung

The fib Model Code 2010 for Concrete Structures introduces numerical simulation as a new tool for designing reinforced concrete structures. The model of resistance based on non-linear analysis requires adequate model validation and a global safety format for verifying designs. The numerical simulations combined with random sampling offer the chance of an advanced safety assessment. Approximate methods of global safety assessment are discussed and compared in a case study. An example of a bridge design supported by non-linear analysis is shown.

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Allaix, Diego Lorenzo; Carbone, Vincenzo Ilario; Mancini, Giuseppe Global safety format for non-linear analysis of reinforced concrete structures Structural Concrete 1/2013 29-42 Technical Papers

Kurzfassung

Semi-probabilistic safety formats for the non-linear analysis of reinforced concrete structures are of practical interest for structural designers. The safety format proposed in EN 1992-2 enables a safety assessment through a non-linear structural analysis and the application of a global safety factor, which is defined as the ratio between the representative and design values of the material resistances. A more realistic estimate of the global safety factor can be obtained from the distribution of the structural response. This paper proposes a safety format based on the mean values of the material resistances and a global resistance factor. Its practical application in the structural design of concrete beams and columns is also presented.

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Muttoni, Aurelio; Lurati, Franco; Fernández Ruiz, Miguel Concrete shells - towards efficient structures: construction of an ellipsoidal concrete shell in Switzerland Structural Concrete 1/2013 43-50 Technical Papers

Kurzfassung

Concrete shells have been widely used in the past as economical and suitable solutions for a number of structures such as roofs, silos, cooling towers and offshore platforms. Taking advantage of their single or double curvature, bending moments and shear forces are limited, and the structures develop mostly membrane (in-plane) forces, allowing them to span large distances with limited thicknesses (typically just a few centimetres). In recent decades, advances in numerical modelling, formwork erection and concrete technology have opened up a new set of possibilities for the use of concrete shells. This paper describes the design and construction of a shell in the form of an ellipsoid (93 × 52 × 22 m) and with thickness varying between 100 and 120 mm. The shell was built using sprayed concrete and also ordinary concrete in some regions. A number of tailored solutions were also adopted, such as post-tensioning, addition of fibres and shear studs, to ensure satisfactory performance at both the serviceability and ultimate limit states.

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Ahmad, Syed Ishtiaq; Tanabe, Tada-aki Three-dimensional FE analysis of reinforced concrete structures using the lattice equivalent continuum method Structural Concrete 1/2013 51-59 Technical Papers

Kurzfassung

The lattice equivalent continuum model (LECM) has proved to be very effective in analysing reinforced concrete structures in two-dimensional cases. That model is extended here to three dimensions and is fitted to a finite element formulation for analysing three-dimensional reinforced concrete structures. In any of the three principal directions, the stress-strain behaviour of concrete will be affected by the stress state in the other two directions. Consequently, stress-strain curves for concrete will shift from a uniaxial pattern. This phenomenon is considered in this work by selecting concrete peak stresses in three alternative approaches. The effectiveness of those approaches is also evaluated. The results of the calculations show good reproduction of the test data, which indicates the validity of this proposed 3D modelling of reinforced concrete.

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Lee, Tai-Kuang; Chen, Cheng-Cheng; Pan, Austin D.E.; Hsiue, Kai-Yuan; Tsai, Wei-Ming; Hwa, Ken Experimental evaluation of large circular RC columns under pure compression Structural Concrete 1/2013 60-68 Technical Papers

Kurzfassung

Eight sets of large, circular, short reinforced concrete columns were tested under monotonic axial compression. The primary variables are type of transverse reinforcement (spiral vs. circular tie), type of splice, end hook length and staggered length of adjacent circular ties. The tests confirmed the acceptable performance of the circular tie newly proposed in ACI 318M-11. In addition, the circular tie scheme in which the ends terminate with hooks that engage with a longitudinal steel bar and bend into the concrete core is acceptable for performance and ease of construction. The effectiveness of its end hook length and the staggered length of adjacent circular ties is also investigated.

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Pérez Caldentey, Alejandro; Corres Peiretti, Hugo; Peset Iribarren, Joan; Giraldo Soto, Alejandro Cracking of RC members revisited: influence of cover, &phgr;/&rgr;s, ef and stirrup spacing - an experimental and theoretical study Structural Concrete 1/2013 69-78 Article

Kurzfassung

This article describes an experimental programme aimed at studying the effect of cover, ratio between diameter and effective reinforcement ratio (&phgr;/&rgr;s, ef) and the influence of stirrup spacing on the cracking behaviour of reinforced concrete elements. The experimental programme was conceived in order to contribute to the debate - fuelled by the publication in recent years of Eurocode 2 EN1992-1-1 and the revision of the Model Code under way when the tests were carried out (and now published as a finalized document) - regarding the influence of these parameters on cracking. Important theoretical aspects are discussed, including where the crack width is estimated by current code formulations and what relevance this may have on the correlation between crack opening and durability of RC structures, especially with regard to structures with large covers. The effect of stirrup spacing, a variable absent from current codes, is also discussed.

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fib-news: Structural Concrete 1/2013 Structural Concrete 1/2013 79-85 fib-news

Kurzfassung

fib-days in Chennai, India
fibUK Technical Meeting in recognition of Andrew Beeby
Design of Concrete Bridges: fib short course in Ankara, Turkey
New fib officers
Gordon Clark visits Japan
Short notes
Congresses and symposia
fib membership benefits
Acknowledgement

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Contents: UnternehmerBrief Bauwirtschaft 1/2013 UnternehmerBrief Bauwirtschaft 1/2013 Contents

Kurzfassung

No Abstract.

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Ernst & Sohn (Hrsg.) Jahresinhaltsverzeichnis 2012 UnternehmerBrief Bauwirtschaft 1/2013 0 Jahresinhaltsverzeichnis

Kurzfassung

Keine Kurzfassung verfügbar.

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Schalk, Günther Architekten-Weitblick vertraglich geschuldet? 1/2013 UnternehmerBrief Bauwirtschaft 1/2013 1 Editorial

Kurzfassung

No Abstract.

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Kurz infomiert UnternehmerBrief Bauwirtschaft 1/2013 2 Kurz informiert

Kurzfassung

Baukonjunktur im Herbst etwas abgekühlt
Avus-Sanierung in Berlin als Modell für Partnerschaft
Europäische Regelungen bringen Sand ins Getriebe

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Morgen, Karl Die feste Fehmarnbeltquerung - 18 km Tunnel unter Wasser UnternehmerBrief Bauwirtschaft 1/2013 3-9 Berichte

Kurzfassung

Der Weg von Deutschland nach Dänemark ist nicht weit - im westlichen Bereich grenzen die beiden Länder unmittelbar aneinander. Im östlichen Bereich trennen rund 20 Kilometer Wasser die beiden Staaten - eigentlich nicht viel, aber doch zu viel. Die Reisezeit ist für unsere schnelllebige Gesellschaft zu lang, die Reise zu umständlich: Autos und Züge werden auf Schiffe verladen, über den Fehmarnbelt verschifft und dort wieder entladen - oder umgekehrt. Seit Jahrzehnten schon kursieren aus diesem Grund Pläne für eine feste Fehmarnbeltquerung. Die Gretchenfrage: Über Wasser (Brücke) oder unter Wasser (Tunnel)? Nachdem jahrelang eine Brücke geplant war, stehen die Zeichen jetzt auf einen Rekordtunnel unter Wasser. Der UBB stellt das ehrgeizige Projekt vor, das nicht nur bautechnisch eine große Herausforderung darstellt, sondern auch von der genehmigungsrechtlichen und finanziellen Seite.

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Steuerstart 2013: Diese Rechte sollten Sie wahrnehmen UnternehmerBrief Bauwirtschaft 1/2013 10-11 Berichte

Kurzfassung

No Abstract.

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