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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Xiang, Haifan Cable-Stayed Bridges. 40 Years of Experience Worldwide. From H. Svensson Steel Construction 3/2012 157 Book review

Kurzfassung

Keine Kurzfassung verfügbar.

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Ritakallio, Pekka O. Cold-formed high-strength tubes for structural applications Steel Construction 3/2012 158-167 Articles

Kurzfassung

Cold-formed hollow sections are the dominant tubular construction material. The applicability of cold-formed tubes is sometimes questioned because of doubts about low-temperature ductility, deformation capacity of welded joints, suitability for welding in the cold-formed corner, poor fatigue behaviour of the corner or suitability for hot-dip galvanizing. It is also claimed that by choosing hot-finished tubes, such risks can be automatically avoided. This study confirms that appropriate tube manufacturing yields cold-formed EN 10219 tubes in grades S355J2H to S460MH with a performance equal to or better than hot-finished tubes. Properly made cold-formed high-strength tubes are available for fabricating efficient lightweight structures and can be safely used even at low temperatures without the aforementioned doubts.

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Anton Tedesko Medal awarded to Paul Grundy Steel Construction 3/2012 167 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Schiborr, Markus; Stranghöner, Natalie Experimental investigations into the application of direct tension indicators with preloaded structural bolting assemblies (HV system) to EN 1090-2 Steel Construction 3/2012 168-174 Articles

Kurzfassung

EN 1090-2 provides several tightening methods for the preloading of bolting assemblies. One of the prescribed procedures is the use of direct tension indicators, so-called DTIs, with lubrication according to k-class K0. According to the definition of k-class K0, the lubrication should not have an influence on achieving the required preloading force Fp,C. For this reason, the main focus of the investigations presented here was how the lubrication influences the behaviour of preloaded HV bolting assemblies with and without DTIs. The experimental investigations were carried out on the institute’s own tightening torque testing machine.

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Somaini, Diego; Knobloch, Markus; Fontana, Mario Buckling of steel columns in fire: non-linear behaviour and design proposal Steel Construction 3/2012 175-182 Articles

Kurzfassung

In a fire the buckling strength of steel columns is heavily influenced by the distinctly non-linear material behaviour of steel at elevated temperatures. A general analytical model that explicitly includes the non-linear material behaviour is presented here and verified with full-scale tests at elevated temperature. Based on test results and this general model, a new model for flexural buckling is developed which can be used to design slender columns and allows non-linear stress-strain relationships, geometrical imperfections and load eccentricities to be considered. In addition, the model can be easily extended to include local cross-section instabilities describing the interaction between local and global buckling phenomena.

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Kindmann, Rolf; Vette, Jan General information for and improvements to the design with scheduled torsion according to EN 1993-1-1 Steel Construction 3/2012 183-190 Articles

Kurzfassung

First of all, this article outlines and discusses the design rules for torsional loading according to EN 1993-1-1. Afterwards, the partial internal force method for I-, U- and Z-sections is presented. The verification for arbitrary internal forces is possible with this alternative method. The methods are compared and verified by existing test results.

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Ruukki delivers the steel structures for the largest shopping centre in Scandinavia Steel Construction 3/2012 190 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Maraveas, Chrysanthos; Swailes, Thomas; Wang, Yong A detailed methodology for the finite element analysis of asymmetric slim floor beams in fire Steel Construction 3/2012 191-198 Articles

Kurzfassung

The aim of this paper is to present a detailed methodology for the three-dimensional finite element analysis of asymmetric slim floor beams under fire conditions. A fully controlled solution process is suggested through a detailed step-by-step presentation of the simulation parameters incorporated into the model. Work has been carried out so that any asymmetric slim floor beam can be assessed using the same consistent method, which is validated against two reported fire tests. Time-temperature and time-vertical displacement curves are calculated for the appropriate comparisons with experimental results, which show that the proposed methodology can accurately predict the thermal and structural behaviour of such beams.

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Outstanding Structure Award 2012 Steel Construction 3/2012 198 News

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 3/2012 Steel Construction 3/2012 199-202 ECCS News

Kurzfassung

Conferences
Announcements
Technical Committees (TC) activities
TC News
ECCS Eurocode design manuals
Software

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Puthli, Ram Frans Bijlaard reaches 65 Steel Construction 3/2012 203 People

Kurzfassung

Keine Kurzfassung verfügbar.

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The Developing City Exhibition Steel Construction 3/2012 203 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Rinke, Mario Vom Eisenbau zum Stahlbau. Tragwerke und ihre Protagonisten in Berlin 1850-1925. From Ines Prokop Steel Construction 3/2012 204 Book review

Kurzfassung

Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 3/2012 Structural Concrete 3/2012 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Taerwe, Luc; Helland, Steinar Recent developments Structural Concrete 3/2012 141-142 Editorials

Kurzfassung

Keine Kurzfassung verfügbar.

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Stucchi, Fernando The challenge of structural design Structural Concrete 3/2012 143-144 Editorials

Kurzfassung

Keine Kurzfassung verfügbar.

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Beck, Matthias; Burkert, Andreas; Harnisch, Jörg; Isecke, Bernd; Osterminski, Kai; Raupach, Michael; Schießl, Peter; Tian, Wei; Warkus, Jürgen Deterioration model and input parameters for reinforcement corrosion Structural Concrete 3/2012 145-155 Articles

Kurzfassung

The paper presents the damage model of German Research Unit 537 which was used as a working hypothesis for the development of a user-friendly design model. Excerpts from the laboratory experiments and numerical calculations processed in project A of the research unit are presented here. The excerpts include the quantification of self-corrosion, geometrical effects in the macrocell corrosion, development of corroding steel surface and pit depth as well as the quantification of the resistivity of the concrete and the corrosion of steel in cracked concrete.

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Osterminski, Kai; Schießl, Peter Design model for reinforcement corrosion Structural Concrete 3/2012 156-165 Articles

Kurzfassung

The performance-based durability design of reinforced concrete structures for corrosion of reinforcement is currently limited to the initiation period. That includes modelling the transport processes of chlorides and carbon dioxide into the concrete structure. Up to now, the subsequent time period after depassivation of the reinforcement, in which corrosion propagates, could not be modelled in a comparable manner. The task of the research project presented here, which was part of German Research Unit 537, was to develop a design model that enables a reinforced concrete structure to be designed against reinforcement corrosion for its entire service life. Therefore, a physically well-defined damage model for corrosion propagation was chosen as a basis. All system parameters in the damage model were investigated on the basis of numerical and laboratory studies carried out in the subprojects of the research unit. Statistical analysis allowed the simplification of the complex damage model into a user-friendly design model. This paper presents the working steps, the basic results of the analysis and the user-friendly full-probabilistic design model for reinforcement corrosion.

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Caratelli, Angelo; Meda, Alberto; Rinaldi, Zila Design according to MC2010 of a fibre-reinforced concrete tunnel in Monte Lirio, Panama Structural Concrete 3/2012 166-173 Articles

Kurzfassung

This paper discusses the possibility of using precast tunnel segments in fibre-reinforced concrete without traditional reinforcement. The case study of a hydraulic tunnel in Monte Lirio, Panama, excavated with a tunnel boring machine (TBM) by SELI S.p.A., has been analysed.
The segments were designed according to the draft of Model Code 2010. In order to achieve the required performance and to optimize the structural behaviour, three different types of steel fibre were considered in the research.
The design was backed up by full-scale tests on precast segments. In particular, 18 full-scale tests were performed, including point load tests simulating the thrust of the TBM and bending tests. The results show the good behaviour of the elements and indicate the fibre-reinforced concrete suitable for the precast elements.

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Raphael, Wassim; Faddoul, Rafic; Geara, Fadi; Chateauneuf, Alaa Improvements to the Eurocode 2 shrinkage model for concrete using a large experimental database Structural Concrete 3/2012 174-181 Articles

Kurzfassung

Shrinkage plays an important, sometimes crucial, role in the design of many types of concrete structures as well as in their behaviour after construction. However, the uncontrolled strains are often larger than the expected values. As a matter of fact, there is as yet no perfectly satisfactory physical explanation for shrinkage. In this work, a large database has been set up for shrinkage testing performed by several research centres in Europe. On the basis of the statistical analysis of this database and by observing real structural behaviour, it becomes possible to investigate the current codes of practice regarding the computation of time-dependent shrinkage strains. As comparison with experimental tests has shown that predictions are often inaccurate, a correction factor is proposed in this work to improve the European Code, Eurocode 2, and lead to more satisfactory results.

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Lohaus, Ludger; Oneschkow, Nadja; Wefer, Maik Design model for the fatigue behaviour of normal-strength, high-strength and ultra-high-strength concrete Structural Concrete 3/2012 182-192 Articles

Kurzfassung

Fatigue design according to CEB-FIP Model Code 90 is limited to concrete grades up to C80. In addition, the design rules include a strength-dependent reduction in the fatigue reference strength, which leads to uneconomical design of high-strength concrete. Considering comprehensive knowledge now available concerning the fatigue behaviour of normal-strength and high-strength concretes, the amount of this reduction can no longer be justified. A new design model for compressive fatigue loading and its derivation is presented in this article. A comparison between the new design model and the current standard ones reveals that the new design model ensures safe and economical design of normal-strength, high-strength and ultra-high-strength concrete. This new design model is included in the new fib Model Code 2010.

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Ayoub, Essam; Malek, Charles; Helmy, Gamal Considerations for the design of doubly unsymmetrical precast pretensioned beams used for box girder construction Structural Concrete 3/2012 193-199 Articles

Kurzfassung

Many box girder bridges are constructed with doubly unsymmetrical precast beam units. The aim of this paper is to present special considerations for the optimum arrangement of pretensioned strands in a simply supported precast pretensioned beam with a doubly unsymmetrical section. The goal of the optimum arrangement is to minimize the distortion (lateral sway phenomenon) caused by the doubly unsymmetrical characteristic of the beam section at transfer. The study shows that the distortion of the unsymmetrical section is minimized when the resultant stresses at transfer are constant over all of the top flange and over all of the bottom flange of the precast beam for most of the sections within the beam length. In this case, the neutral axes of these sections will be horizontal with respect to the beam section. This approach is verified with the help of two different finite element models. In the first model, the beam is modelled as one-dimensional space frame elements; in the second model, the beam is modelled using three-dimensional solid elements. A practical example of a box girder bridge made from doubly unsymmetrical precast pretensioned beams in the APM (Automated People Mover) elevated bridge project in Saudi Arabia is also presented.

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fib-news: Structural Concrete 3/2012 Structural Concrete 3/2012 201-209 fib-news

Kurzfassung

• Focus on sustainability at the 2012 fib symposium in Stockholm
• 2012 fib Medals of Merit awarded in Stockholm
• 9th International fib Ph.D. Symposium in Karlsruhe
• Bond in Concrete 2012 held in Brescia, Italy
• Sustainability short course held in Naples
fib Bulletins
• Rüdiger Rackwitz † 1941-2012
• Impact factor
• Short notes
• Congresses and symposia
• Acknowledgement

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Contents: UnternehmerBrief Bauwirtschaft 3/2012 UnternehmerBrief Bauwirtschaft 3/2012 Contents

Kurzfassung

No Abstract.

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Schalk, Günther Mission: Dicke Bretter bohren ? 3/2012 UnternehmerBrief Bauwirtschaft 3/2012 1 Editorial

Kurzfassung

No Abstract.

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