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Hamburgs Tanzende Türme mit immobilienmanager.AWARD ausgezeichnetStahlbau3/2014164Aktuell

Kurzfassung

Keine Kurzfassung verfügbar.

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May, Marc; Ruppert, Matthias; Seeßelberg, ChristophZur wirtschaftlichen Bemessung von optimierten Walzprofil-Kranbahnträgern für Laufkrane nach EurocodeStahlbau3/2014165-173Fachthemen

Kurzfassung

Eine wirtschaftliche Standardanwendung von Walzprofilen sind Kranbahnträger für Laufkrane. In der bisherigen Bemessungspraxis wurden und werden überwiegend HE-Profile in der Stahlgüte S235 eingesetzt, welche eine zweckmäßige Lösung für Kranbahnträger kurzer bis mittlerer Spannweiten bei kleinen bis mittleren Radlasten darstellen. Sowohl für größere Spannweiten als auch für größere Radlasten und die Kombination aus beiden kommen HE-Profile an ihre Grenzen. Im folgenden Beitrag wird der Einsatz von HD- und HL-Walzprofilen aus S355 für Kranbahnträger untersucht und die Vorteile dieser weniger bekannten Profilreihen dargestellt.

On the economic design of optimized rolled section runway beams for top mounted overhead cranes.
Crane runway beams are an economic standard application of hot rolled sections. In today’s design practice HE sections in grade S235 are commonly used, which represents a suitable solution for crane runway beams of short to intermediate spans and small to medium wheel loads. For bigger spans as well as for higher wheel loads and the combination of both HE sections arrive to their limits. In the following article the application of HD and HL rolled-sections in grade S355 for crane runway beams are examined and the advantages of this less known section ranges are presented.
Marc May
Matthias Ruppert
Christoph Seeßelberg

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Mensinger, Martin; Möller, HeidrunEinfluss von Querkraftanschlüssen auf das Biegedrillknicken von Einfeldträgern - Teil 2: Aufbereitung für die PraxisStahlbau3/2014174-185Fachthemen

Kurzfassung

Querkraftanschlüsse stellen eine häufig verwendete oberkantenbündige Verbindungsmöglichkeit eines Nebenträgers an einen Hauptträger dar. Hierbei zeichnen sich insbesondere lange Fahnenblechanschlüsse durch ihre Vorteile in der Montage aus. Ausgeklinkte Träger mit Doppelwinkel- oder Fahnenblechanschlüssen müssen aufgrund der Ausklinkung des Nebenträgers umständlich zwischen die Hauptträger eingeschwenkt werden, stellen aber nichts desto trotz eine gerne verwendete Anschlussform mit großer Tradition dar. Allen Varianten gemein ist die Tatsache, dass sie kein Gabellager bilden, sondern ein torsionsweiches Auflager. Damit sind die üblichen Berechnungsmöglichkeiten zur Ermittlung des idealen Biegedrillknickmomentes Mcr nicht anwendbar. Um für Träger mit diesen Anschlüssen Mcr ermitteln zu können und damit die Grundlage für einen normkonformen Nachweis zu legen, bedurfte es einiger eingehender Untersuchungen. Im Rahmen des AiF-Forschungsvorhabens 16872 N wurden diese Untersuchungen am Lehrstuhl für Metallbau der Technischen Universität München durchgeführt. Im folgenden Beitrag wird auf die Erkenntnisse der Parameterstudie, das Ersatzmodell zur Ermittlung von Mcr sowie auf die weiteren Hilfsmittel, aufbereitet für die Praxis, eingegangen (s. auch Teil 1 [9]).

Influence of hinged connections on the lateral-torsional buckling of single-span beams - Part 2: Practical application.
Hinged connections are an often used type of connection between secondary and primary beam with flushed upper flanges. A very economic type of connection in terms of manufacturing and erection are long fin-plates. Unfortunately they are no fork bearing, therefore the usual formula for the elastic critical moment Mcr for beams cannot be used. To design a beam according to DIN EN 1993-1-1 it is necessary to know the actual stiffness of such connections to be able to consider it in the calculation of Mcr. This is also the case for other typical hinged connections like notched beams with either fin-plate or double angle connection. This problem of otherwise very economic connections is the reason for taking a closer look at their influence on the lateral-torsional buckling in the research project AiF-No. 16872 N at the Lehrstuhl für Metallbau (chair of metal structures) der Technischen Universität München. The following second part of the paper deals with the results of the parametric study, the substitute model to calculate Mcr and the additional aids for practical use (for part 1 of the paper see [9]).

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Chen, Weizhen; Xie, Zhenlin; Yan, BochongResearch on the general method for extrapolating traffic load effects for highway bridgesStahlbau3/2014186-198Fachthemen

Kurzfassung

Accurate knowledge of real traffic load levels is one of the prerequisites for structural safety assessments, and the common method used to extrapolate load effects depends on the analysis of effect crossing rate distribution according to Rice’s Theory. But as proved by the analysis made in this paper from three perspectives (theoretical basis of the method, determination of fitting starting class interval and discreteness of extrapolated effects), the method is flawed in at least three respects: obvious deviation between the presumption of Rice's Theory and the real distribution of crossing rate, narrow application range (extremely high traffic density) and unreliability in extrapolation of effects. Besides, the method only estimates the effects of the return period, without a reliability analysis of randomness in sampling and thus an effective estimation of effect range containing true values. Therefore, this paper, after analysing the relation between return period and extreme value distribution of load effects, as well as the occurrence rule for return period effects, proposes a general method for extrapolating traffic load effects on highway bridges. The general method, with the characteristic of high utilization of sample data in effect extrapolation from crossing rate distribution, is wide in its scope of application; it can be used for traffic flows with different densities and influence lines with different forms and lengths, and provides a confidence interval for estimated effect values. The method thus represents a significant improvement to the reliability of extrapolating effects for different return periods.

Forschungen zur allgemeinen Methode der Extrapolation von Verkehrslastwirkungen auf AutobahnbrüKen.
Eine genaue Kenntnis des realen Verkehrslastniveaus ist eine der Voraussetzungen einer bautechnischen Sicherheitsbewertung. Die verbreitete Methode zur Extrapolation von Lasteinflüssen hängt ab von der Analyse der Effekt-Durchgangsraten-Verteilung entsprechend der Theorie von Rice. Diese Methode hat Schwächen in mindestens drei Bereichen: in ihren theoretischen Grundlagen, der Bestimmung einer passenden Start-Klassenweite sowie der Diskretheit extrapolierter Effekte. Dies wird durch die Betrachtungen im vorliegenden Beitrag gezeigt. Die Theorie von Rice weicht offensichtlich von den meisten realen Verteilungen der Durchgangsrate ab, hat einen engen Anwendungsbereich (extrem hohe Verkehrsdichte) und ist unzuverlässig bei der Extrapolation von Effekten. Zudem werden durch die Methode Auswirkungen der Wiederholungsperiode nur geschätzt: eine Zuverlässigkeitsanalyse zur Wahllosigkeit der Stichproben fehlt, und somit fehlt auch eine brauchbare Einschätzung des Wirkungsbereichs, der den wahren Wert enthält. Daher schlägt der vorliegende Beitrag eine allgemeine Methode zur Extrapolation von Verkehrslasteinflüssen auf Autobahnbrücken vor. Grundlagen sind die Analyse des Zusammenhangs zwischen Wiederholungsperiode und Extremwertverteilung der Lasteinflüsse sowie die Erscheinung einer Regel über die Effekte der Wiederholungsperiode. Ein Charakteristikum dieser allgemeinen Methode ist die starke Nutzung von Stichproben bei der Extrapolation von Effekten aus der Durchgangsraten-Verteilung. Die allgemeine Methode hat einen breiten Anwendungsbereich für verschiedene Verkehrsflussdichten und für Wirklinien verschiedener Formen und Längen. Sie liefert weiterhin einen Vertrauensbereich für geschätzte Effektwerte und somit eine deutlich höhere Zuverlässigkeit der Extrapolation von Effekten für verschiedene Wiederholungsperioden.

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Rubin, HelmutLösung und Gewinner der Weihnachtspreisaufgabe 2013Stahlbau3/2014199-204Berichte

Kurzfassung

Keine Kurzfassung verfügbar.

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Brux, GuntherPretziener Wehr - Nachhaltiger Stahlbau im Bestand dank angepasstem und neuem KorrosionsschutzStahlbau3/2014205-207Berichte

Kurzfassung

Seit über 135 Jahren besteht südlich von Pretzien an der Elbe das größte Schützentafelwehr Europas als wirksamste Hochwasserschutzeinrichtung Mitteldeutschlands; es regelt den Zulauf zu einem rd. 25 km langen Umflutkanal vorbei an den Städten Magdeburg und Schönebeck sowie bei Niedrigwasser für die Schiffbarkeit der Elbe. Das Wehr besteht noch fast unverändert, doch mussten in den letzten Jahren vor allem Stahlbauteile wegen Werkstoffalterung und Korrosion behandelt oder auch denkmalschutzgerecht ausgetauscht werden.

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Moormann, Christian9. Hans Lorenz Symposium an der Technischen Universität BerlinStahlbau3/2014208Tagungsberichte

Kurzfassung

Keine Kurzfassung verfügbar.

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Schmidt, HartwigAuf den Spuren großer Erfinder und Konstrukteure. Von A. Hart-DavisStahlbau3/2014208-209Rezensionen

Kurzfassung

Keine Kurzfassung verfügbar.

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Schmitz , ChristophBrücken und Tunnel der Bundesfernstraßen 2013 - Dokumentation. Vom Bundesministerium für Verkehr, Bau und StadtentwicklungStahlbau3/2014209-210Rezensionen

Kurzfassung

Keine Kurzfassung verfügbar.

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Zuverlässigkeitsanalysen zur Kapazitätsbemessung von Stahlrahmen. Von Dr.-Ing. Max GündelStahlbau3/2014210Dissertationen

Kurzfassung

Keine Kurzfassung verfügbar.

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Heise, Franz-JosefBemessung von ermüdungsbeanspruchten Bauteilen aus hoch- und ultrahochfesten Feinkornbaustählen im Kran- und Anlagenbau: Rechnerische Nachweise - Kerbdetails - Lastkollektive (P 778)Stahlbau3/2014211Aus der Forschung

Kurzfassung

Keine Kurzfassung verfügbar.

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Aktuell: Stahlbau 3/2014Stahlbau3/2014211-213Aktuell

Kurzfassung

22. Bayerischer Ingenieuretag
Windräder aus der Ferne vermessen
Promotionsrecht für forschungsstarke Fachhochschulen
Dokumentation “Fassaden aus Wetterfestem Baustahl“

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Termine: Stahlbau 3/2014Stahlbau3/2014213-214Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 3/2014Steel Construction3/2014Content

Kurzfassung

Keine Kurzfassung verfügbar.

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Mazzolani , Federico; Landolfo, RaffaeleEurosteel 2014Steel Construction3/2014167Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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da Silva, Luís SimõesMessage from the Chairman of the Editorial BoardSteel Construction3/2014168Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Jiang, Jian; Li, Guo-Qiang; Usmani, AsifInfluence of fire scenarios on progressive collapse mechanisms of steel framed structuresSteel Construction3/2014169-172Articles

Kurzfassung

OpenSees is an open-source object-oriented software framework developed at UC Berkeley. The OpenSees framework has been recently extended to deal with structural behaviour under fire conditions. This paper presents the results of a numerical study, using OpenSees, of the progressive collapse of steel frames exposed to fire. After validating the capability of OpenSees against available analytical and experimental results of fire tests on steel members, a parametric study is carried out to find the progressive collapse mechanism of steel frames exposed to fire and corresponding influencing factors. The factors include load levels, lateral restraint, beam strength and fire scenarios. The catenary action of beams is considered by using a temperature-dependent corotational beam/column element. The results show that different progressive collapse mechanisms can happen due to the sequence of the buckling of columns. High load levels lead to the downward collapse of the whole structure compared with the lateral collapse for low load levels. The existing of lateral restraint causes the premature buckling of bottom columns which triggers the whole frame collapse. As the beam section increases, the collapse mechanism of steel frames changes from beam failure mode to column failure mode. The fire scenarios have significant effect on the collapse mode of steel frames. The work presented in this paper is a preliminary study of the progressive collapse of steel frames. Further work is underway to combine the influence of the effect of concrete floors. A simple design method is then expected to be proposed to investigate the robustness of steel structures against progressive collapse due to fire.

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Dubina, Dan; Stratan, Aurel; Vulcu, Cristian; Ciutina, AdrianHigh strength steel in seismic resistant building framesSteel Construction3/2014173-177Articles

Kurzfassung

Seismic resistant building frames designed as dissipative structures, must allow for plastic deformations to develop in specific members, whose behaviour is expected to be predicted and controlled by proper calculation and detailing. Members designed to remain elastic during earthquake, such as columns, are characterized by high strength demands. Dual-steel structural systems, optimized according to a Performance Based Design (PBD) philosophy, in which High Strength Steel (HSS) is used in predominantly “elastic” members, while Mild Carbon Steel (MCS) is used in dissipative members, can be very reliable and cost efficient. Because present seismic design codes do not cover this specific configuration, an extensive European research project [1], HSS-SERF - High Strength Steel in Seismic Resistant Building Frames, was carried out with the aim to investigate and evaluate the seismic performance of dual-steel building frames. On this purpose, and based on a large numerical and experimental program, the following objectives have been focused into the project:
1. to find reliable structural typologies and joint/connection detailing for dual-steel building frames, (e. g. of HSS and MCS members), and to validate them by tests and advanced numerical simulations,
2. to develop design criteria and performance based design methodology for dual-steel structures using high strength steel,
3. to recommend relevant design parameters (i. e. behaviour factor q, overstrength factor Ω) to be implemented in further versions of the seismic design code, EN 1998-1 [1], in order to apply capacity design approach for dual-steel framing typologies,
4. to evaluate technical and economic benefit of dual-steel approach involving HSS.

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Ciupack, Yvonne; Pasternak, Hartmut; Schiel, Manuel; Ince, ErdenizAdhesive bonded joints in steel structuresSteel Construction3/2014178-182Articles

Kurzfassung

While classic joining techniques in steel construction have undergone advancements, fundamental problems still remain. The utilisation of structural bonding can remedy the situation, but despite having many advantages, has not been able to establish itself in civil engineering and specifically steel construction. The reason for this are doubts by engineers, architects and contractors regarding the verifiability, durability and load bearing capacity of bonded steel constructions. In order to facilitate the use of the innovative joining technique in construction, it is necessary to process bonded joints close to standardisation.

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Fujita, Masanori; Sakai, Junpei; Oda, Hirotaka; Iwata, MamoruBuilding system for a composite steel-timber structureSteel Construction3/2014183-187Articles

Kurzfassung

In order to address global environmental issues, there is an urgent need for the building structure field to use as much timber as possible to contribute to reforestation, as well as to research and develop a building system that does not diminish the structure’s functionality and safety [1]. The building structure field is required to actively use this wood as timber, but the timber is too weak to use for large buildings. Research and development of an appropriate building system that can utilize such timber is necessary.
This study examines the possibility of developing a building system for a composite steel-timber structure utilizing the authors’ wealth of expertise in steel structure construction. Different types of composite steel-timber structure building systems are categorized, and their features are described. Furthermore, the individual types are evaluated for the performance requirements needed to develop a building system.

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Prachar, Martin; Jandera, Michal; Wald, Franti ek; Zhaob, BinFire resistance of slender section beams - Subjected to lateral torsional bucklingSteel Construction3/2014188-192Articles

Kurzfassung

The paper shows experimental and numerical research into slender cross-section beams in case of fire. The topic is very important because little investigation has been made and little experimental data has been collected so far. In the framework of the RFCS project FIDESC4 - Fire Design of Steel Members with Welded or Hot-rolled Class 4 Cross-sections, several simple supported beams were tested at elevated temperature at the Czech Technical University in Prague.
Currently, Eurocode 3 contains a number of simple rules for design of slender Class 4 cross-sections which, based on recent numerical simulations, proved themselves to be over-conservative. Through refining these rules, material savings could be achieved, which would lead to greater competitiveness of the steel structures. This is being covered in existing research, but is not published in this paper, which is limited to lateral torsional buckling behaviour only.
Determination of the bending resistance for members subjected to lateral torsional buckling of Class 1-3 cross-sections at elevated temperature is based on the same principles as the design at room temperature, according to EC 3 part 1-1 [1]. However, it differs in using only one imperfection factor for all types of cross-sections. The informative Annex E of the standard (EC 3 part 1-2 [2]) recommends using the design formulas for slender (Class 4) sections as well. But there is a restriction of the critical temperature value and a different reduction of yield strength is used (0.2 % proof strength for Class 4 instead of 2.0 % proof strength for stockier Class 1-3 sections). For the non-uniform members (variable section height), a limited design procedure is given in EC 3 part 1-1 [1]. This is applicable for room temperature only. The possibility of using these rules for fire design is not yet confirmed.

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Kurrer, Karl-EugenHistory of Virtual Work Laws. A History of Mechanics Prospective. From: D. CapecchiSteel Construction3/2014192Book review

Kurzfassung

Keine Kurzfassung verfügbar.

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Souza dos Santos, Eliane; de Miranda Batista, Eduardo; Camotim, DinarCold-formed steel columns under L-D-G interaction - Experimental investigationSteel Construction3/2014193-198Articles

Kurzfassung

The paper addresses an experimental programme that is part of an ongoing investigation on the behaviour, strength and design of cold-formed steel lipped channel columns undergoing mode interaction involving local, distortional and global buckling. The 16 column specimens tested were selected to exhibit either (i) close local, distortional and critical buckling loads (PcrL ≍ PcrD ≍ PcrG) or (ii) PcrL ≍ PcrD (condition ensured via the cross-sectional dimensions) and PcrG up to around 20 % below or above that value (difference controlled via the column length). The test set-up, procedure and results are presented and discussed, and the failure load data obtained are used to explore the possibility of developing a design approach based on the direct strength method (DSM).

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Zhang, Xi; Rasmussen, KimTests of cold-formed steel portal frames with slender sectionsSteel Construction3/2014199-203Articles

Kurzfassung

Cold-formed steel sections are widely used in many applications such as structural frames, scaffolding systems, purlins and storage racks. In particular, cold-formed steel portal frames can be an alternative to conventional hot-rolled steel portal frames for industrial, rural and residential low rise buildings. The advantages of using cold-formed steels include a higher strength-to-weight ratio and reduced material, erection and transportation costs.
Over the past two decades a number of researchers [1] to [3] have undertaken tests on cold-formed steel portal frames. The tests mainly focused on the behaviour of joints, and employed relatively stocky sections. Hence, they provided little insight into the effects of cross-sectional instability on the overall stability of the frame.
In this paper, three portal frame tests are described, the main purpose of which was to study the effect of cross-sectional instability on the two-dimensional sway failure of cold-formed steel. The tests demonstrated significant local and distortional buckling before reaching the ultimate load. Finite element models were calibrated against the tests. The calibrated models therefore can be used for a parametric study to investigate the significance of the additional second-order effects caused by local/distortional bucking. The paper details the tests and the numerical simulations.

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Steel frame for new extension to terminal at Oslo AirportSteel Construction3/2014203News

Kurzfassung

Keine Kurzfassung verfügbar.

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