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Dicleli, CengizSchicksal der Freybrücke - ein Baudenkmal wurde entsorgtStahlbau2/2016161-168Fachthemen

Kurzfassung

Karl Bernhard gilt als einer der bedeutendsten Bauingenieure in Deutschland Anfang des 20. Jahrhunderts. Seine beiden Brücken entlang der Heerstraße in Berlin, die Stößenseebrücke und die Freybrücke über die Havel, sind seit 1909 verkehrstechnisch von höchster Bedeutung für die Ost-West-Verbindung der Stadt. Die Freybrücke wurde jedoch im März 2015 abgerissen, um einem Ersatzneubau Platz zu machen. Wie kam es dazu, dass eine historisch und verkehrstechnisch derart wichtige, seit 1971 unter Denkmalschutz stehende Konstruktion so lange vernachlässigt wurde, bis sie abbruchreif war? Dieser Artikel ist eine Hommage an Bernhards Havelbrücke und geht ihrer wechselvollen Geschichte nach.

The fate of the Frey Bridge in Berlin - A memorial structure was disposed.
Karl Bernhard is one of the significant German civil engineers of the beginning of the 20th century. His two bridges along the Heerstrasse in Berlin, the Stössensee Bridge and the Frey Bridge which are crossing the Havel River, have been since 1909 of paramount importance for the East-West traffic connection of the city. The Frey Bridge was demolished in March 2015 in order to make room for a new substitution bridge. How was it possible at all that from a historical and traffic-technical point of view such an important construction has been neglected so long that it became ripe for demolition? And although it was under preservation since 1971? This article is a homage to Bernhard’s Havel Bridge and follows up its rich history.

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Intelligente Bauwerke - Prototyp zur Ermittlung der Schadens- und Zustandsentwicklung für Elemente des BrückenmodellsStahlbau2/2016168-169Aus der Forschung

Kurzfassung

Keine Kurzfassung verfügbar.

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Schmitz, ChristophBrücken und Tunnel der Bundesfernstraßen 2015Stahlbau2/2016169Rezensionen

Kurzfassung

Keine Kurzfassung verfügbar.

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Krätzig, Wilfried B.Geschichte der Baustatik. Auf der Suche nach dem Gleichgewicht. Von K.-E. KurrerStahlbau2/2016169-170Rezensionen

Kurzfassung

Keine Kurzfassung verfügbar.

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Aktuell: Stahlbau 2/2016Stahlbau2/2016170-172Aktuell

Kurzfassung

Edelstahl Rostfrei im Brückenbau
Bauaufsichtliche Zulassung für ein reaktives Brandschutzsystem für Zugglieder

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Aktuell: Stahlbau 2/2016Stahlbau2/2016172-173Korrosionsschutz

Kurzfassung

Feuerverzinkte Brücken sparen Kosten
Regelwerke für den Korrosionsschutz im Eisenbahnbrückenbau

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Termine: Stahlbau 2/2016Stahlbau2/2016173-174Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 2/2016Steel Construction2/2016Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Seidl, GünterBridge construction - a strong driving force for developments in composite constructionSteel Construction2/201679Editorials

Kurzfassung

Keine Kurzfassung verfügbar.

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Feldmann, Markus; Kopp, Maik; Pak, DanielComposite dowels as shear connectors for composite beams - background to the German technical approvalSteel Construction2/201680-88Articles

Kurzfassung

Composite dowels are known as powerful shear connectors in steel-concrete composite girders. They are being used more and more in practice, especially for prefabricated composite bridges. Compared with headed studs, they provide increased strength. They also exhibit good deformation capacity even in high-strength concrete. Further, their use in steel sections without an upper flange is very simple. However, a lack of standards for composite dowels with the economic clothoid and puzzle shapes has led to hesitations regarding applications, which is often due to delays in the approval process. Hence, the aim of the recently finished German research project P804 funded by FOSTA, the Research Association for Steel Application, was to solve unanswered questions concerning these innovative shear connectors and to prepare a national technical approval available for any design office or construction company. This paper describes the technical rules derived for ultimate and fatigue limit states, the structural design principles and instructions for production and construction, and provides further background information.

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Psychiatric Hospital Sans Souci - Jette, BelgiumSteel Construction2/201688News

Kurzfassung

Keine Kurzfassung verfügbar.

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Lorenc, WojciechThe design concept for the steel part of a composite dowel shear connectionSteel Construction2/201689-97Articles

Kurzfassung

The design concept for the steel part of a composite dowel shear connection is based on a geometric stress concept and it assumes the superposition of individual stress components resulting from longitudinal shearing and bending of a composite section. Analytical transformations of FEM calculation results for critical regions in steel dowels lead to the solution represented by closed interaction curves for the dimensionless shear resis tance of the connection versus the axial resistance of the web.

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Lorenc, WojciechNon-linear behaviour of steel dowels in shear connections with composite dowels: design models and approach using finite elementsSteel Construction2/201698-106Articles

Kurzfassung

The theoretical background to the elastic design of steel dowels is presented in [1], what constitutes the basis for Fatigue Limit State (FLS) and Serviceability Limit State (SLS) are given. In this paper assumptions for Ultimate Limit State (ULS) and mechanical models are presented for both shapes covered by the German National Technical Approval [2]. The yield strength of steel is assumed in the plastic design of steel dowels, contrary to the tensile strength of steel used in the case of headed studs. A dis cussion on this aspect is presented using results obtained by finite elements which are presented in [3]. Hence, a consistent approach for ULS, SLS and FLS is established which is based on the statement that the resistance of a unit length of a shear connection with steel dowels does not depend on the size of the dowels and the ductility of the connection is a linear function of the dowel size.

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New ECCS publication: Design of joints in steel and composite structuresSteel Construction2/2016106News

Kurzfassung

Keine Kurzfassung verfügbar.

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Kozuch, Maciej; Rowinski, SlawomirElastic behaviour of the steel part of a shear connection with MCL composite dowels - Design basis for serviceability and fatigue limit statesSteel Construction2/2016107-114Articles

Kurzfassung

In this paper the authors present numerical and analytical approaches for establishing rules for dimensioning MCL steel connectors for serviceability and fatigue limit states. Two unit models were adopted for the stress calculations by means of FEM: the first one for taking into account the notch effect of the longitudinal cutting line on the stress pattern in a uniformly tensioned steel plate, the second one for determining the stress pattern in a steel connector due to longitudinal shearing between the steel and concrete parts of the beam. A mathematical approach for establishing an envelope of the connector's resistance is presented. A detailed study of the fatigue behaviour of steel connectors is presented in the second part of the paper. Possible crack patterns and their development mechanisms are described, justified by appropriate FEA and test results.

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World crude steel production 137 million tonnes for 66 countries (March 2016)Steel Construction2/2016114News

Kurzfassung

Keine Kurzfassung verfügbar.

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Kopp, Maik; Pak, Daniel; Feldmann, MarkusEffects of transverse tension load on the static capacity and fatigue resistance of composite dowelsSteel Construction2/2016115-121Articles

Kurzfassung

Composite dowels are powerful shear connectors in steel-concrete composite structures, especially for prefabricated composite bridges. The advantages of composite dowels over other shear connectors are their increased strength and sufficient slip capacity even in high-strength concrete. The National Technical Approval for Germany [1], [2] from 2013 allows the design of composite structures with composite dowels for hogging and sagging moments under static and cyclic loading. However, the design of structures with cyclic loading in combination with centric tension perpendicular to the composite dowels (transverse tension) is neglected. Therefore, one part of national project P967 “External reinforcement for composite bridges”, funded by FOSTA, the Research Association for Steel Application, was to determine how transverse tension affects the static capacity and fatigue resistance of composite dowels. To investigate this effect, two test series, each with six push-out tests, were carried out. The test setup and the results of the static and cyclic shear tests in combination with transverse tension are presented in this paper.

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Luo, Guoqing; Mensinger, MartinAnchorage of external reinforcement in the case of rigid clampingSteel Construction2/2016122-131Articles

Kurzfassung

In the case of frame bridges with external reinforcement, the reinforcing elements have to be anchored in the abutment wall. Owing to the interaction of negative bending moment and longitudinal shear force in the abutment area, the force transfer between concrete, external steel reinforcement and normal steel reinforcement is complex. Two frame structure tests were carried out to investigate the loadbearing behaviour and rational anchorage length of external reinforcement in abutments. Two different anchorage lengths were tested, and the structural behaviour and failure modes of the two specimens were compared and analysed. The results indicate that the anchorage length has a great influence on the loadbearing capacity, and the pull-out effect at the end of the external reinforcement should be paid special attention. The detail stress distribution and the M-V interaction in the anchored external reinforcement were obtained from the tests and the results fit well with the theoretical calculation. Mechanical models are proposed to evaluate the pull-out effect and optimize the anchorage length of the external reinforcement.

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Lechner, Thomas; Gehrlein, Sebastian Felix; Fischer, OliverStructural behaviour of composite dowels in thin UHPC elementsSteel Construction2/2016132-137Articles

Kurzfassung

Composite dowels with different shapes have been developed and used in composite members during the last two decades. At the Chair of Concrete and Masonry Structures at Technical University of Munich (TUM), composite dowels with a clothoid shape are used for filigree composite beams and columns. In both types of application the composite dowels are used as external reinforcement and Ultra-High Performance Concrete (UHPC) is chosen instead of normal-strength concrete. This article describes mainly the results of the preliminary push-out tests that were carried out in order to determine the structural behaviour of composite dowels in thin UHPC elements and verify the influence of the UHPC web thickness, the steel thickness of the shear connector, the concrete compressive strength and the influence of reinforcement on the loadbearing capacity and failure modes. The paper also includes an overview of and the outlook for the experiments with composite beams and composite columns.

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Classen, Martin; Hegger, JosefAnchorage of composite dowelsSteel Construction2/2016138-150Articles

Kurzfassung

In steel-concrete composite beams, lifting effects between the steel section and the concrete slab usually occur incidentally and have comparatively small load ordinates compared with the shear forces transferred. For this reason, lifting forces are generally irrelevant for the dimensioning of the composite joint. Nevertheless, this statement does not apply if shear connectors are used for the systematic anchorage of pull-out forces. Although the anchorage behaviour of conventional shear connectors, e.g. headed studs, has already been studied extensively, appropriate investigations into the anchorage behaviour of concrete composite dowels are lacking, especially for composite dowels in slender or cracked concrete slabs. In this paper, the anchorage behaviour of a puzzle-shaped concrete composite dowel is investigated in cracked and uncracked concrete. To this end, particular test setups were developed. All tests were simulated using a three-dimensional, non-linear finite element model. Finally, an engineering model for calculating the anchoring capacity of single composite dowels and composite dowel groups in reinforced and unreinforced concrete is presented.

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Llinares, Monica Aracil; Schöne, Lutz; Weininger, FlorianA new ETFE façade creates a landmark for Puebla F.C.Steel Construction2/2016151-155Articles

Kurzfassung

Cuauhtémoc Stadium, a first division football stadium in Puebla, México, with more than 51 000 seats, has recently been completely renovated. The brand-new façade has become an icon for the club and for the city. The façade is designed as a skin of single-layer ETFE foil in a combination of three different shades of blue and translucent white. The design and construction of the façade is the result of an international collaboration between local contractor DÜNN Lightweight Architecture, from Zapopan, Mexico, and LEICHT Structural engineering and specialists consulting GmbH, based in Munich, Germany. This paper will elaborate on the boundary conditions of the project and the technical decisions made for the construction of the façade.

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ECCS news: Steel Construction 2/2016Steel Construction2/2016156-159ECCS news

Kurzfassung

Keine Kurzfassung verfügbar.

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Kühn, BertramGeschichte der Baustatik: Auf der Suche nach dem Gleichgewicht. Kurrer, K.-E.Steel Construction2/2016159Book reviews

Kurzfassung

Keine Kurzfassung verfügbar.

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Talebitari, BurkhardPost-war building materials in housing in Brussels 1945-1975. Van de Voorde, Stephanie; Bertels, Inge; Wouters, IneSteel Construction2/2016159-160Book reviews

Kurzfassung

Keine Kurzfassung verfügbar.

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Announcements: Steel Construction 1/2016Steel Construction2/2016160Announcements

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Keine Kurzfassung verfügbar.

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