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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Jäppelt, Ulrich Karl Morgen 60 Jahre Stahlbau 4/2012 348-349 Persönliches

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Münchner Stachusbauwerk erhält Auszeichnung für hervorragenden Brandschutz Stahlbau 4/2012 349-350 Aktuell

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Termine: Stahlbau 4/2012 Stahlbau 4/2012 350-352 Termine

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Keine Kurzfassung verfügbar.

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Loipersberger, Anton Handbuch Technischer Lawinenschutz. Grundlagen, Entwurf und Bemessung, Beispiele. Von Rudolf-Miklau, F., Sauermoser, S. (Hrsg.) Stahlbau 4/2012 350 Rezensionen

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Content: Steel Construction 4/2012 Steel Construction 4/2012 Content

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Ungermann, Dieter; Brune, Bettina; Lübke, Sebastian Numerical and analytical investigations on plain channels in coupled instabilities Steel Construction 4/2012 205-211 Articles

Kurzfassung

This paper presents numerical and analytical investigations of thin-walled steel C-section members subjected to both local and global buckling. The results presented here are based on experimental tests which are dealt with in a previous publication [1]. Numerical calculations using the finite element method are performed to recalculate test results from stub column tests with local buckling and long column tests with coupled local and global buckling failure. These results are analysed using different design procedures based on Eurocode 3. Using modified buckling factors and an approach considering effective stiffness by approximation, it is possible to determine the ultimate buckling loads from tests and numerical investigations efficiently.

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Dimakogianni, Danai; Dougka, Georgia; Vayas, Ioannis; Karydakis, Phaedon Innovative seismic-resistant steel frames (FUSEIS 1-2) - experimental analysis Steel Construction 4/2012 212-221 Articles

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Two innovative systems of seismic-resistant steel frames with dissipative fuses were developed within the European Research Programme “FUSEIS”. The first, named FUSEIS 1, resembles a shear wall, whereas in the second system, named FUSEIS 2, the devices are made by introducing a discontinuity into the composite beams of a moment-resisting frame. The main advantage of “FUSEIS” compared with conventional systems is that inelastic deformations are strictly concentrated and controlled in zones that constitute easily replaceable fuses. The dissipative elements can be positioned in small areas of the building and do not interrupt the architectural plan as braces do. Another advantage of the system is the possibility of easy installation and removal within the structure.
This article presents the results of the experimental and analytical investigations of the innovative energy dissipation system FUSEIS 1. The system consists of two closely spaced strong columns connected by dissipative beams within each storey. In order to enhance the stiffness, strength and energy dissipation capacity of the system, several fuses are provided within each storey. During a strong seismic event, the dissipative zones are formed within the pins while the other parts of the structure remain elastic and protected.

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Biehounek, Josef; Grolik, Helmut; Herz, Susanne Probabilistic safety analysis of loadbearing bar structures according to second-order theory for the combination of time-dependent loads Steel Construction 4/2012 222-231 Report

Kurzfassung

The article describes a method for the probabilistic risk assessment of loadbearing bar structures according to second-order theory without having to indicate expressly the limit state equation. The load combination is also considered in the course of the calculation. Time-dependent loads are modelled as pulse processes with a rectangular form. The sequence of load renewals has a Poisson distribution and the magnitude of the load is subjected to a Pearson distribution. The distribution of the maximum values of the safety-relevant load reaction is obtained by means of the Monte Carlo simulation. The basis is a generalization of the deformation method. The probability of cross-section failure is determined for an exemplary loadbearing structure. The probability is sensitive to the distribution parameters of the processes. For certain loading constellations, this analysis contradicts the safety concept of building practice.

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IABSE - The First 80 Years. From T. F. Peters Steel Construction 4/2012 231 Book review

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Keine Kurzfassung verfügbar.

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Helbig, Thorsten; Oppe, Matthias Roofs and façades of United States Institute of Peace, Washington D. C. Steel Construction 4/2012 232-237 Reports

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The Institute of Peace’s new facility, a modern conference and an interactive educational center dedicated to the theme of peacemaking, faces the National Mall in Washington, DC and is within sight of the Lincoln, World War II, Korean, and Vietnam Veterans memorials. The building is organized around two atria, one part facing the Potomac River, the other the Mall and the Lincoln Memorial. The north atrium serves as the centerpiece for the spaces devoted to the organization’s work and research, and the south-facing atrium is focused on public programs and conferences. The roof of the building features a series of undulating, wing-like elements constructed of steel frame and white translucent glass forming an image resembling the wings of a dove. The glass appears opaque and white during the day and glows gently from within at night.
The two roofs and four curtain wall façades have been designed, fabricated and installed by seele, being responsible for the realization. Optimisation of conceptual design, structural and detailed design for the free forms of the self-supporting shell structures and the vertical facades was conducted by Knippers Helbig, Advanced Engineering.

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Espion, Bernard The Vierendeel bridges over the Albert Canal, Belgium - their significance in the story of brittle failures Steel Construction 4/2012 238-243 Reports

Kurzfassung

Between 1933 and 1938, some 50 Vierendeel-type welded road bridges were erected in Belgium to provide crossings over the Albert Canal or the Campine canals. They were the first significant applications of electric arc welding in Belgium and constitute the majority of the large welded bridges built at that time in Belgium. It was the heyday of the Vierendeel bridge, which had been invented in 1895 but which had found only limited applications before 1930, with less than 40 built in Belgium and Congo in 30 years. But this rapid application of welding to structural steelwork encountered many problems that were probably overlooked in the climate of euphoria surrounding bridge-building. In March 1938 the Hasselt Bridge suffered a brittle failure. This is generally regarded as the first brittle failure of a large all-welded structure and received much attention at that time. But in 1940 at least three other bridges of this series were also badly fractured and there are indications that some others also experienced serious cracking problems. This paper places theses accidents in perspective in the long story of brittle failures.

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Zhang, Min; Wan, Tianbao; Wang, Yingliang The Design of Langqi Min River Bridge, Fuzhou, China Steel Construction 4/2012 244-249 Reports

Kurzfassung

One key project in the Chinese city of Fuzhou is Langqi Min River Bridge, which connects the business and technology district with downtown Fuzhou. The main bridge is a twin-pylon cable-stayed structure with a main span of 680 m and a steel box girder. This paper presents the detailed design features of the bridge, including foundations, anti-ship collision devices, pylons, steel box girder and stay cables.

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Laustsen, Bjarke Stability of brackets and stiffeners in steel structures Steel Construction 4/2012 250 Errata

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Keine Kurzfassung verfügbar.

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Renner, Anja; Lange, Jörg Load-bearing behaviour of high-strength bolts in combined tension and shear. Steel Construction 4/2012 250 Errata

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Keine Kurzfassung verfügbar.

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Pelke , Eberhard; Kurrer, Karl-Eugen The art of major bridge-building - Hellmut Homberg and his contribution to multiple cable-stayed spans Steel Construction 4/2012 251-265 Reports

Kurzfassung

Based on findings from Büchenauer Bridge (1956), the North Elbe Bridge in Hamburg (1963) and the bridge over the Rhine at Leverkusen (1965), Homberg designed and engineered the Friedrich Ebert Bridge across the River Rhine. This was the first bridge in the world with cables that distribute instead of concentrate the load transfer, and thus define the bridge deck as a continuous, elastically supported element and not as a beam on point supports.
After the building of major bridges declined in Germany, Homberg became active in France, and later rounded off his work with multi-cable-stayed bridges in the UK. That work resulted in the Queen Elizabeth II Bridge (1991), Homberg’s late magnum opus.
This article contains a complete catalogue of Homberg’s multi-cable-stayed bridges and discusses for the first time previously unpublished designs by Homberg. These prove that he had already moved on from the classic cable-stayed bridge to the general multi-span cable-stayed bridge as early as 1963.

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The diamond-shaped roof of the Vienna Central Railway Station* Steel Construction 4/2012 266-267 Reports

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Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 4/2012 Steel Construction 4/2012 268-272 ECCS News

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Conferences
Announcements
Technical Committees (TC) activities
TC News

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Contents: Structural Concrete 4/2012 Structural Concrete 4/2012 Contents

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Keine Kurzfassung verfügbar.

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Clark, Gordon Concrete, Cars, Computers and Climate Change Structural Concrete 4/2012 211-212 Editorial

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Keine Kurzfassung verfügbar.

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Beckmann, Birgit; Schicktanz, Kai; Reischl, Dirk; Curbach, Manfred DEM simulation of concrete fracture and crack evolution Structural Concrete 4/2012 213-220 Articles

Kurzfassung

A two-dimensional simulation of concrete behaviour using the discrete element method (DEM) is presented in this work. The main aim of this paper is the modelling of the failure process and crack initiation. The failure process of a concrete prism during a compression test is simulated. A substructure representing the concrete components - aggregate and cement matrix - is introduced. It is shown that convex and concave concrete specimens can be treated, whereas the particle geometry always remains convex. The crack patterns of the concrete specimens resulting from the simulation are shown and compared with laboratory experiments. It is shown that the calculated peak load does not depend on the particle number used in the simulation. The ratio of lateral strain to longitudinal strain of the concrete specimen during load application is simulated and compared with experimental results.

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Al-Akhras, Nabil M. Performance of olive waste ash concrete exposed to alkali-silica reaction Structural Concrete 4/2012 221-226 Articles

Kurzfassung

This work investigates the effect of olive waste ash (OWA) on the durability of concrete exposed to alkali-silica reaction (ASR). Three OWA contents were considered in the work: 7, 15 and 22 %, with crushed Pyrex glass used as reactive fine aggregate. The other experimental parameters investigated in the study were: w/c ratio (0.4 and 0.5) and air content (non-air-entrained and air-entrained). The OWA concrete specimens were submerged in 1-N NaOH solution at 40 °C to accelerate the ASR. The ASR damage was monitored by measuring the expansion of concrete prisms and the decrease in compressive strength.
The study demonstrates that OWA concrete is more resistant to ASR deterioration than plain concrete. The durability of OWA concrete with respect to ASR damage improved with the increase in OWA content. The OWA concrete with a w/c ratio of 0.4 exhibited a better performance with respect to ASR deterioration than the OWA concrete with a w/c ratio of 0.5. The air-entrained OWA concrete exhibited better durability with respect to ASR damage than the non-air-entrained OWA concrete.

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Larsson, Oskar; Thelandersson, Sven Transverse thermal stresses in concrete box cross-sections due to climatic exposure Structural Concrete 4/2012 227-235 Articles

Kurzfassung

Spatial and temporal temperature variations in a concrete structure due to variations in the surrounding climate will produce movements which, if restrained, may induce stresses in the structure. To get a better understanding of transverse thermal stresses due to climatic effects in concrete box cross-sections, the FE simulations in this study have been performed using extensive climatic input data directly or by using simplified methods to simulate the temperature and resulting stress fields in a section of the hollow concrete arch of the New Svinesund Bridge. Studies of other cross-sections with varying depth, width and wall thicknesses have also been performed to investigate the geometrical influence. The results reveal an overestimation of the maximum thermal tensile stress when using a linear temperature differential approach compared with the direct use of climate data that includes the non-linear part of the temperature distribution. The effect of depth, width and orientation is negligible compared with variations in thickness between slabs and walls. For box sections with slabs/walls having different thicknesses, the transverse thermal stresses will be significantly larger in the thinner members, irrespective of the actual orientation and position of the member.

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Jiang, Wei; Gong, Jian; De Schutter, Geert; Huang, Yulin; Yuan, Yong Time-dependent analysis during construction of concrete tube for tower high-rise building Structural Concrete 4/2012 236-247 Articles

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Vertical and differential deformations in super-high-rise buildings are extremely important during construction. In order to be able to adjust the construction process accurately, taking the deformations into account, such deformations must be calculated exactly. The analysis of the vertical deformations of the high-rise Shanghai World Financial Centre building is illustrated in this paper. The prediction models of CEB-FIP 90 are used for calculating shrinkage and creep. The fictitious degree of hydration method has been applied for calculating the creep behaviour of the early-age concrete. The influence of steel bars on the vertical deformations has been analysed based on the macroscopical modulus method. Calculation of the vertical deformations includes the pre-construction and the post-construction deformations. Finally, the differential deformation between the concrete and the mega-structure column is determined. Theoretical results for the vertical displacement of this super-high-rise building agree very well with field monitoring data.

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Bertagnoli, Gabriele; Giordano, Luca; Mancini, Simona Design and optimization of skew reinforcement in concrete shells Structural Concrete 4/2012 248-258 Articles

Kurzfassung

Nowadays, it is more and more often necessary to design two-dimensional reinforced concrete elements to satisfy both architectural demands and to comply with traffic safety requirements in the design of road and railway infrastructures. In fact, the demand for non-regular structural geometry is increasing in both cases.
As a consequence, the use of finite element analyses to model structures and calculate internal actions is constantly growing because closed-form solutions are generally unavailable for irregular shapes. Therefore, the problem of reinforcement design needs our attention because steel bars, in general, should be placed in non-orthogonal directions and can vary over the structure.
Consequently, there are two different kinds of design problem: choice of reinforcement direction and evaluation of the reinforcement ratio between the chosen directions, with the aim of minimizing the total amount.
Such problems can be easily overcome by generalizing a mechanical model consolidated in the literature for orthogonal reinforcement for skew directions. The model is set up according to the ultimate plastic behaviour of the elements. An optimization technique based on genetic algorithms is then applied to the new model to reduce the amount of reinforcement.
This paper describes both the ultimate resisting mechanism with generic reinforcement directions and the way genetic algorithms are employed to optimize the amount of reinforcement.

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fib-news: Structural Concrete 4/2012 Structural Concrete 4/2012 259-267 fib-news

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Call for entries: 2014 fib Awards for Outstanding Concrete Structures
fib 2013 Symposium, Tel Aviv
Commission 9 update
70th birthday symposium for Rolf Eligehausen
BEFIB2012 - An overview
Symposium for Joost Walraven
fib bulletins
Walter Thorpe † 1928-2012
Congresses and symposia
Acknowledgement
2012 reviewers

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