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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Kurpiela, Aneta Optimierung von Sandwichwandbauteilen mit PUR-Kern und Stahldeckschichten Stahlbau 1/2015 37 Dissertationen

Kurzfassung

Keine Kurzfassung verfügbar.

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Kuhlmann, Ulrike; Euler, Mathias; Hubmann, Michael; Bucak, Ömer; Fischl, Andreas; Mangerig, Ingbert; Hess, Andreas; Kranz, Bernd; Herrmann, Jörg; Zschech, Roland Ermüdungsgerechte Fachwerke aus Rundhohlprofilen mit dickwandigen Gurten Stahlbau 1/2015 38-51 Fachthemen

Kurzfassung

Der Beitrag gibt einen Überblick über die Ergebnisse des ZUTECH-Forschungsvorhabens FOSTA P815, das sich mit dem Ermüdungsverhalten von geschweißten K- und KK-Knoten in Fachwerken aus Rundhohlprofilen mit dickwandigen Gurten beschäftigt hat. Im Mittelpunkt des Beitrags stehen die experimentellen und numerischen Untersuchungen, die zu Planungs-, Fertigungs- und Bemessungsempfehlungen für die Praxis zusammengefasst wurden.

Fatigue-resistant trusses of circular hollow sections with thick-walled chords.
This paper gives an overview about the results of the ZUTECH-Research Project FOSTA P815 dealing with the fatigue behaviour of welded K- and KK-joints in trusses made of circular hollow sections with thickwalled chords. The focus is laid on the experimental and numerical investigations that had been summarized to recommendations on planning, fabrication and design for practitioners.

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Górski, Jaros?aw; Mikulski, Tomasz; Ozi b?o, Magdalena; Winkelmann, Karol Effect of geometric imperfections on aluminium silo capacities Stahlbau 1/2015 52-57 Fachthemen

Kurzfassung

An aluminium silo with initial imperfections is analysed. Two types of imperfection are considered. The first one takes the form of local indentations in the shell; their size and range are adopted on the basis of the standard guidelines. The second type is a global imperfection described through the use of its eigenforms and by means of two-dimensional random fields. The calculations are limited to two cases of loading: negative pressure and wind. The choice of the loading has been suggested in Eurocodes. In the case of wind load, the probability distribution of its direction is taken into account.

Einfluss geometrischer Imperfektionen auf die Belastbarkeit von Aluminium-Silokonstruktionen.
Ein Aluminium-Silo mit anfänglichen Imperfektionen wird untersucht. Zwei Typen von Imperfektion werden angenommen. Der erste Typ sind lokale Vertiefungen der Hülle. Ihre Größe und Anordnung werden auf Grundlage von Normrichtlinien festgesetzt. Der zweite Typ ist eine globale Imperfektion, die mittels ihrer Eigenformen und zweidimensionaler Zufallsfelder beschrieben wird. Die Berechnungen sind auf zwei Lastfälle beschränkt, negativer Druck und Wind. Die Auswahl der Belastung wurde in Eurocodes vorgeschlagen. Bei der Windlast wird die Wahrscheinlichkeitsverteilung der Windrichtung berücksichtigt.

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Zwei Designpreise für Vallourec-Produktfilme Stahlbau 1/2015 57 Aktuell

Kurzfassung

Keine Kurzfassung verfügbar.

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Möller, Eberhard Himmelstürmend - Bauten und Visionen der Hochhausstadt Frankfurt seit 1945 Stahlbau 1/2015 58-63 Fachthemen

Kurzfassung

Keine andere Stadt in Deutschland bietet eine solch spannende Hochhauskulisse wie die Bankenmetropole Frankfurt am Main, “analog zu Frankfurts Mainhattan Skyline wird Downtown New York oft als Manhattan bezeichnet“. Dieses treffende Bonmot des Schriftstellers Andreas Neumeister illustriert die städtebauliche, architektonische und baukonstruktive Bedeutung des hessischen Wolkenkratzer-Ensembles. In Ergänzung zu den beinahe ausschließlich von außen erlebbaren etwa 530 Hochhäusern der Stadt, erläutert das Deutsche Architekturmuseum in Frankfurt am Main politische, gesellschaftliche aber auch bauliche Hintergründe und Entwicklungen. Die Ausstellung “Himmelstürmend - Hochhausstadt Frankfurt“ wird dort bis zum 19. April 2015 gezeigt.

Skyward - Buildings and Visions of the Highrise City Frankfurt since 1945.
No other city in Germany offers such an exciting skyscraper backdrop like the banking metropolis of Frankfurt am Main, “analogous to the Frankfurt Mainhattan skyline downtown New York often is referred as Manhattan”. This apt quip of the writer Andreas Neumeister illustrates the urban, the architectural but also the constructional importance of the Hessian skyscraper ensemble. In addition to the view from outside to the about 530 high-rise buildings of the city, the exhibition of the Deutsches Architekturmuseum in Frankfurt am Main explores political and social as well as architectural backgrounds and developments. The exhibition “Skyward - Highrise City Frankfurt” is open till April 19, 2015.

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Kranz, Bernd; Wagner, Steffen; Keitel, Steffen Verantwortlichkeiten bei Stahlbauprojekten Stahlbau 1/2015 64-68 Berichte

Kurzfassung

Die Handelnden in der Kette beginnend beim Entwurf über die Bemessung, die Konstruktion bis hin zur Fertigung und Montage haben entsprechende Verantwortlichkeiten zu übernehmen. Bereits beim Entwurf einer Konstruktion sind fertigungsrelevante Vorgaben zu beachten. Aber auch in der Fertigung ist auf Erfordernisse einzugehen, die sich aus der Bemessung ergeben. Auf dem Stahlbausektor existiert dafür mit den Normenreihen DIN EN 1990, DIN EN 1991, DIN EN 1993 ff. und DIN EN 1090 ein in sich geschlossenes Regelwerk, wobei die Erstgenannte für den Bereich der Bemessung und der Konstruktion und die zweite für die Fertigung und die Montage steht. Seit Einführung der DIN EN 1090 sind nun auch die Bemessung und die Konstruktion in die Überprüfung hinsichtlich der Konformität zum aktuell geltenden Regelwerk einzubeziehen. Nach zweijähriger Erfahrung in diesem Bereich ist festzustellen, dass die Vorschriften hinsichtlich der Bemessung und Konstruktion weitgehend beherrscht werden. Die fertigungsrelevanten Vorgaben aus der DIN EN 1090 werden hingegen noch häufig nur unzureichend berücksichtigt. Mit diesem Beitrag sollen die sich daraus ergebenden Probleme dargestellt aber auch Lösungsmöglichkeiten für eine entsprechende Aus- und Weiterbildung aufgezeigt werden.

Responsibility for steel construction projects.
The actors in the chain beginning with the design via calculation, construction to manufacturing and assembling have to assume corresponding responsibilities. The fabrication-relevant design specifications have to be considered already in the design. Responding to requirements that arise from the design is important in the production, too. A self-contained set of rules exists in the steel construction sector. The standard series DIN EN 1990, DIN EN 1991 and DIN EN 1993 et seqq. are the base for structural designers and constructing engineers, and DIN EN 1090 is the base for the manufacturers and assembly operators. With the introduction of DIN EN 1090 the design and construction are also included in checking for conformity at the currently applicable regulations. After two years of experience in this area it is to be noted that the rules have largely been mastered in terms of design and construction. The fabrication-related requirements of DIN EN 1090 are, however, often still insufficiently taken into account. The resulting problems are presented as well as solutions. A contribution of an appropriate education and training will be presented.

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Polónyi, Stefan 40 Jahre Dortmunder Modell Bauwesen Stahlbau 1/2015 69-72 Berichte

Kurzfassung

Keine Kurzfassung verfügbar.

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Internationaler Contest im Bauingenieurwesen - The Art of Structural Design Stahlbau 1/2015 72 Aktuell

Kurzfassung

Keine Kurzfassung verfügbar.

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Ulrich Finsterwalder Ingenieurbaupreis 2015 - Impressionen von der Jurysitzung am 21.11.2014 Stahlbau 1/2015 73-80 Berichte

Kurzfassung

Keine Kurzfassung verfügbar.

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Aktuell: Stahlbau 1/2015 Stahlbau 1/2015 81-84 Aktuell

Kurzfassung

Ingenieurpreis des Deutschen Stahlbaues 2015 entschieden
Schweizer Stahlbaupreis Prix Acier 2014
Fotografiepreis der Bundesstiftung Baukultur für Stahlobjekt

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Termine: Stahlbau 1/2015 Stahlbau 1/2015 84 Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 1/2015 Steel Construction 1/2015 Content

Kurzfassung

Keine Kurzfassung verfügbar.

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Fischer, Oliver; Mangerig, Ingbert; Mensinger, Martin; Siebert, Geralt; Inoue, Susumu; Sugiura, Kunitomo; Yamaguchi, Takashi; Ohyama, Osamu 10th Japanese-German Bridge Symposium Steel Construction 1/2015 1 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Borjigin, Sudanna; Kim, Chul-Woo; Chang, Kai-Chun; Sugiura, Kunitomo Non-linear seismic response analysis of vehicle-bridge interactive systems Steel Construction 1/2015 2-8 Articles

Kurzfassung

The intention of this study is to investigate how vehicles on highway bridges affect the seismic responses of the bridges under strong ground motions. Most highway bridge design codes do not consider the live load in the seismic design of highway bridges because of the low probability of the two events of the critical live load and an earthquake occurring at the same time. As a result, little attention has been paid to the influence of vehicle loads on the seismic responses of highway bridges. However, considering the high probability of traffic jams on urban roads, it is preferable to examine and clarify the dynamic interaction effect of vehicles on road bridges while subjected to seismic loads. In this study, the vehicle-bridge-ground motion interactions are realized by combining ABAQUS and MATLAB. ABAQUS provides a GUI environment to establish the numerical bridge model and apply the seismic forces, while MATLAB provides a platform to control the iterations in both time and force increments. As a preliminary study, a simplified 3D pier-beam bridge model loaded with multiple vehicles with two degrees of freedom moving at a constant speed has been considered. When subjected to identical, strong seismic loadings, it was observed that the transverse accelerations of the bridge with moving vehicles are smaller than those without moving vehicles. Further, permanent deformation occurs after earthquakes because of yielding at the bottom of the pier; it was observed that the permanent deformations of the bridge with moving vehicles tend to be smaller than those without moving vehicles.

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Tsubomoto, Masahiko; Kawatani, Mitsuo; Mori, Kengo Traffic-induced vibration analysis of a steel girder bridge compared with a concrete bridge Steel Construction 1/2015 9-14 Articles

Kurzfassung

At the preliminary design stage for a highway bridge 81 m long, a three-span continuous girder, including a span of about 30 m, is preferable from the point of construction cost. Generally, the concern is that girder bridges with spans of 30 m, which have a fundamental natural frequency of about 3 Hz, have large traffic-induced vibrations due to the coupling dynamic response with heavy vehicles having a bouncing natural frequency of about 3 Hz. Furthermore, large traffic-induced vibration in girder bridges causes low-frequency sound (LFS) as one of the environmental vibration problems. Two kinds of girder bridge with a length of 81 m - a concrete hollow slab bridge and an eight-girder steel bridge with the same spans - are proposed. For assessing the low-frequency sound radiated from bridges, firstly, the traffic-induced vibrations of two kinds of girder bridge are compared with each other by analysing the coupling dynamic response of bridges due to moving heavy vehicles in a dynamic system.

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Elbe Bridge at Schönebeck wins Structural Award 2014 in the category "Highway or Railway Bridge Structures" Steel Construction 1/2015 14 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Hashimoto, Kunitaro; Kayano, Makio; Suzuki, Yasuo; Sugiura, Kunitomo; Watanabe, Eiichi Structural safety assessment of continuous girder bridge with fatigue crack in web plate Steel Construction 1/2015 15-20 Articles

Kurzfassung

This paper, which focuses on a fatigue crack found in a main girder of a continuous steel girder bridge, assesses the remaining structural safety of the steel bridge with such a fatigue crack in order to judge whether or not urgent action such as closure to traffic or necessary temporary repairs and strengthening should be carried out. Therefore, an elastic-plastic finite displacement analysis is carried out for the continuous three-span non-composite steel girder bridge with four main girders in which a fatigue crack about 1.1 m long in the web plate of the main girder was discovered during an inspection. From the analysis results it is found that the load redistribution function of the multiple main girder system was effective and the remaining load-carrying capacity of such a bridge system is such that there will be no sudden collapse of the entire bridge.

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Kennedy, Stephen J.; Martino, Aldo E. SPS bridge decks for new bridges and strengthening of existing bridge decks Steel Construction 1/2015 21-27 Articles

Kurzfassung

The sandwich plate system (SPS) is a structural composite material made up of two metal plates bonded to a polyurethane elastomer core. SPS delivers high strength and stiffness, making it an excellent alternative to conventional stiffened steel and reinforced concrete. For strengthening of orthotropic bridge decks, SPS Overlay can be used to create a stiff bridge deck without removing the original plates. The renewed deck improves the distribution of wheel loads across the longitudinal stiffening elements, decreases deck curvatures associated with large concentrated wheel loads, extends the fatigue life of fatigue-critical welds and increases the life of the wearing surface and the whole bridge. For new bridge applications, prefabricated SPS bridge deck plates reduce the dead load by up to 70 % compared with concrete bridge decks, thus allowing bridges to carry significantly greater live load without the need for girder or pier strengthening. Deck replacement can be completed while leaving the steel or concrete girders in place or, where speed of erection is critical, pre-assembled longitudinal deck-girder units can be used.

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Lener, Gerhard Steel bridges - numerical simulation of total service life including fracture mechanic concepts Steel Construction 1/2015 28-32 Articles

Kurzfassung

The assessment of the total service life of a steel structure should gain importance in the near future due to the increasing significance of building preservation and building modernization. The main cause of the failure of existing structural steelwork under cyclic loading effects is material fatigue. Most steel structures are, however, failure-tolerant. For economic reasons, this behaviour can be considered by including the crack propagation phase in the assessment. This contribution presents newly developed software tools and the results of some simulations of the total lifetimes of existing structures.

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Mano, Toshihisa; Mangerig, Ingbert Tensile load-carrying behaviour of elastomeric bearings Steel Construction 1/2015 33-41 Articles

Kurzfassung

Elastomeric bearings for seismic isolation applications can be subjected to tensile loads depending on the geometrical configuration, high vertical seismic motion or excessive horizontal deformation due to the elongated-period horizontal motion. It is a known fact that cavities develop within elastomeric material when it undergoes a certain amount of tensile force in a very constrained condition since a high hydrostatic tensile stress builds up. Once these cavities have developed, the tensile stiffness of the bearing drops dramatically. This paper contributes to understanding this phenomenon itself and its influence on the basic properties of elastomeric bearings. For this purpose, two types of elastomeric bearing were tested and the cavitation phenomenon observed. Moreover, those test results are compared with the FE simulation results from the modified hyperelastic material model with the cavity damage criterion. The two-phase softening model presented here can simulate the real softening behaviour of elastomeric bearings well, and it may even help us grasp a better insight into the cavitation phenomenon.

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Prof. Udo Peil awarded honorary doctorate Steel Construction 1/2015 41 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Höglund, Torsten Cold-formed members - comparison between tests and a unified design method for beam-columns Steel Construction 1/2015 42-52 Article

Kurzfassung

In [1] a unified method for the design of steel beam-columns is presented. The method has been checked for rolled steel beam-columns and extruded aluminium beam-columns. It is included in Eurocode 9 [19] for aluminium members and it is proposed to be included also in Eurocode 3 Part 1-3 [16] as well, but then it needs to be checked for typical cold-formed sections.
Cold-formed sections are usually un-symmetric and thin-walled, for instance channel sections or C-shaped sections (lipped channels). When used as compression members, local buckling causes a redistribution of the longitudinal stress which leads to a shift of the effective centroid. The shift causes overall bending and reduces the column strength when the member is compressed between pinned ends. In fixed-ended columns, however, the shift of the effective centroid is balanced by a shift of the applied force and bending is not introduced [6]. As a result, the strength of fixed-ended channel column exceeds that of a pin-ended column of the same effective length [7].
Using effective width for the flanges of channels e.g. according to EN 1993-1-5 [17] gives conservative result as the centroid of the effective section is too close to the web. The mixed effective width/effective thickness method for outstand elements given in Annex D of EN 1993-1-3 [16] is the basis in the following interpretations.

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Enercon wind turbine erected by Liebherr crane Steel Construction 1/2015 52 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Bedair, Osama An analytical expression to determine "realistic" shear buckling stress in cold-formed lipped channels Steel Construction 1/2015 53-58 Article

Kurzfassung

Current North American and European design provisions ignore the rotational restraint when evaluating local web shear buckling stresses in cold-formed steel channels. This paper offers a new analytical expression for computing local buckling shear stresses in cold-formed channel members taking into account the rotational restraints imposed by the flanges and the lips. The expression derived is suitable for hand calculations and can replace current code expressions in order to achieve economical steel designs. Comparisons with existing design formulas currently used in practice for the limiting conditions show a difference within 5 %.

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Phänomenta Science Center in Lüdenscheid, Germany Steel Construction 1/2015 58 News

Kurzfassung

Keine Kurzfassung verfügbar.

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