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Termine: Stahlbau 3/2015Stahlbau3/2015229-230Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 3/2015Steel Construction3/2015Content

Kurzfassung

Keine Kurzfassung verfügbar.

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Heinisuo, Markku; Mäkinen, JariNordic Steel Construction Conference 2015Steel Construction3/2015145Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Janarthanan, Balasubramaniam; Mahendran, Mahen; Gunalan, ShanmuganathanBearing capacity of cold-formed unlipped channels with restrained flanges under EOF and IOF load casesSteel Construction3/2015146-154Articles

Kurzfassung

Bearing failure is a form of localized failure that occurs when thin-walled cold-formed steel sections are subjected to concentrated loads or support reactions. To determine the bearing capacity of cold-formed channel sections, a unified design equation with different bearing coefficients is given in the current North American specification AISI S100 and the Australian/New Zealand standard AS/NZS 4600. However, coefficients are not available for unlipped channel sections that are normally fastened to supports through their flanges. Eurocode 3 Part 1.3 includes bearing capacity equations for different load cases, but does not distinguish between fastened and unfastened support conditions. Therefore, an experimental study was conducted to determine the bearing capacities of these sections as used in floor systems. Twenty-eight web bearing tests on unlipped channel sections with restrained flanges were conducted under End One Flange (EOF) and Interior One Flange (IOF) load cases. Using the results from this study, a new equation was proposed within the AISI S100 and AS/NZS 4600 guidelines to determine the bearing capacities of cold-formed unlipped channels with flanges fastened to supports. A new design rule was also proposed based on the direct strength method.

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News: Steel Construction 3/2015Steel Construction3/2015154News

Kurzfassung

Workshop “Large Valorisation on Sustainability of Steel Structures”
Workshop on Trends and Challenges for Wind Energy Harvesting

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Andreassen, Michael Joachim; Jönsson, JeppeJoint and column behaviour of slotted cold-formed steel studsSteel Construction3/2015155-161Articles

Kurzfassung

Slotted cold-formed steel studs are used in loadbearing external plasterboard walls. The cold-formed steel studs in these walls are supported by and joined to track sections at the top and the bottom. This paper describes the compression testing of the loadbearing studs in order to observe the behaviour of the studs and the track joints. The experiments included a joint design with a special web stiffener used in practice. The studs were C-sections and the tracks were U-sections. Eight different test series were performed. Each test series had different column lengths and thicknesses, both with and without web stiffeners, in order to establish the influence of these on the joint behaviour and loadbearing capacity of the slotted cold-formed steel studs.

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News: Steel Construction 3/2015Steel Construction3/2015161Completed Phd theses

Kurzfassung

Behaviour of cylindrically curved steel panels under in-plane stresses
Robustness of car parks subjected to localized fire

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Luís Simões da SilvaSteel Construction3/2015161People

Kurzfassung

Keine Kurzfassung verfügbar.

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Aarønæs, Anton; Nilsson, Hanna; Neumann, NicolasDynamic response of steel pipe rack structures subjected to explosion loadsSteel Construction3/2015162-166Articles

Kurzfassung

This paper describes a parametric study of the dynamic behaviour of steel pipe rack structures subjected to explosion loading. The pipe rack design is assumed to be a multi-planar lattice girder consisting of rectangular or square hollow sections. Numerical analysis with the finite element method was performed on a series of 54 pipe racks in total, varying parameters such as mass distribution and aspect ratio. The study provides a deeper understanding - and forms the basis for a more accurate prediction - of the dynamic response of multi-planar lattice girder structures such as steel pipe racks.

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Braun, Matthias; Obiala, Renata; Odenbreit, ChristophAnalyses of the loadbearing behaviour of deep-embedded concrete dowels, CoSFBSteel Construction3/2015167-173Articles

Kurzfassung

The development of the “CoSFB-Betondübel” is presented in this paper. The “CoSFB-Betondübel” is a deep-embedded concrete dowel connecting in situ concrete with a steel section to assure composite action and thus allow for composite beam design. The loadbearing behaviour and parameters influencing this behaviour were determined through experimental tests. Special focus was given to the influence of the ratio of the resistance of the concrete dowel to the concrete compression class. The evaluation of the results concluded in a National Technical Approval [1]. Further investigations were performed via FE analysis in ABAQUS. Further, 3D models with non-linear material and geometry were prepared and validation undertaken. In addition, a real application example of CoSFB is shown.

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Hämäläinen, Olli-Pekka; Björk, TimoFretting fatigue phenomenon in bolted high-strength steel plate connectionsSteel Construction3/2015174-178Articles

Kurzfassung

Fretting fatigue is a major obstacle for bolted joints used as an alternative to welding. Several studies of the subject so far have concerned aluminium or titanium joints, but due to the recently developed high-strength steels that can be challenging to weld, the steel industry would also like to explore this field. This paper presents the experimental fatigue test results of double-lap joints in S355 and S960QC steels. The results are compared and analysed using the SWT parameter and an FE model of the test specimen. The noticeable difference in fretting fatigue behaviour of these materials will be explained and the controversial crack initiation issue addressed.

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News: Steel Construction 3/2015Steel Construction3/2015178News

Kurzfassung

Offshore Structures Course
EcoSteelPanel

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Schillo, Nicole; Feldmann, MarkusLocal buckling behaviour of welded box sections made of high-strength steel - Comparing experiments with EC3 and general methodSteel Construction3/2015179-186Articles

Kurzfassung

One aim within the RFCS-funded RUOSTE research project was to study the effects of high-strength steel properties on local buckling. The respective parameters were investigated on 34 stub column specimens. The specimens were made of S500MC, S700MC and S960MC, with a non-dimensional local slenderness varying between 0.64 and 1.55. Extensive imperfection measurements were undertaken and analysed. The specimens were then used in stub column tests to investigate the local buckling behaviour. The results were first compared with the resistance curve of the current Eurocode (EC), which was shown to be rather optimistic, especially towards the slender end of the range. Secondly, the results were compared with the general method, which uses an equivalent imperfection approach.

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"Le Bois aux Daims", Center Parc, Poitou-CharentesSteel Construction3/2015186News

Kurzfassung

Keine Kurzfassung verfügbar.

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Steige, Yvonne; Weynand, KlausDesign resistance of end plate splices with hollow sectionsSteel Construction3/2015187-193Articles

Kurzfassung

This paper presents a design approach for calculating rectangular hollow section (RHS) splices (bolted end plate connections) under tension forces or bending moments in accordance with EN 1993-1-8. Based on models available in the literature, a Eurocode-conform model is presented using the component method. The original model, based on experimental and numerical investigations, uses a three-dimensional yield line method to predict the tension resistance of bolted splices with hollow sections considering the joint as a whole. The adapted model is fully compatible with EN 1993-1-8. Moreover, the original model has been extended to predict also the design moment resistance of such RHS splices.

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Döring, Bernd; Reger, Vitali; Kuhnhenne, Markus; Feldmann, Markus; Kesti, Jyrki; Lawson, Mark; Botti, AndreaSteel solutions for enabling zero-energy buildingsSteel Construction3/2015194-200Articles

Kurzfassung

The European Directive on the Energy Performance of Buildings (EPBD) obliges the member states to ensure that, by 31 December 2020, all new buildings are nearly zero-energy buildings (nZEB). This paper presents solutions for steel-intensive commercial buildings that achieve this requirement. Several key components such as façades, floor systems and steel piles for ground energy storage were investigated in detail using numerous numerical simulations and practical tests of selected options. Furthermore, options for a whole building which fulfil the zero-energy building approach were identified for different European climates by performing a parametric study using a thermal building simulation tool.

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Stranghöner, Natalie; Jungbluth, DominikFatigue strength of marked steel components - Influence of durable marking methods on the fatigue strength of steel componentsSteel Construction3/2015201-209Articles

Kurzfassung

According to EN 1090-2, steel components have to be identifiable and traceable throughout the whole production chain. The choice of identification method is not specified consistently in international rules and standards. In terms of durability and liability, markings should be resistant to particular fabrication processes such as sandblasting, hot-dip galvanizing or coating. The methods are hard stamping, scribing, plasma marking and needling. The effect of the notch caused by the marking process on the fatigue strength of the components has not yet been investigated in detail. As a result, a classification of the notch details in the European detail categories of EN 1993-1-9 is, in principle, impossible. For these reasons, the influence of durable marking methods on the fatigue strength of steel components needs to be clarified by experimental fatigue tests currently being performed at the Institute for Metal and Lightweight Structures, University of Duisburg-Essen. Part of this investigation involves examining the different surface conditions of hard-stamped, scribed, plasma-marked and needled specimens. The experimental investigations are being carried out considering two different steel grades, S355J2 and S460N, and three different steel plate thicknesses, 15, 25 and 40 mm.

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Kido, Ewa Maria; Cywinski, ZbigniewThe new steel-glass architecture of passenger service centres on expressways in JapanSteel Construction3/2015210-215Report

Kurzfassung

Nowadays, modern expressways worldwide are becoming very important arteries for the quick and safe transportation of people and goods. Service centres are located along these roads for the convenience of drivers and passengers. Those centres consist of buildings and other infrastructure elements and provide various services. Usually, buildings represent contemporary trends in architecture and structural engineering. Steel and glass are widely used. This is also the case in Japan but, simultaneously, adequate approaches are being made to respect the country’s own traditions as well. This paper is a continuation of the authors’ previous publications [1], [2], [3] devoted, respectively, to buildings, railway stations and air terminals.

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ECCS News: Steel Construction 3/2015Steel Construction3/2015215-219ECCS News

Kurzfassung

Events
Announcements
Technical Committees (TC) activities
TC news
Further ECCS news

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Danube City Tower: Semi-active dampers respond to various load casesSteel Construction3/2015219-220News

Kurzfassung

Keine Kurzfassung verfügbar.

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Announcement: Steel Construction 3/2015Steel Construction3/2015220Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 3/2015Structural Concrete3/2015Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Caspeele, Robby; Steenbergen, Raphaël; Sørensen, John DalsgaardSpecial issue of "Structural Concrete" with articles from the JCSS workshop on "Risk- and reliability-based assessment of existing structures"Structural Concrete3/2015313Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Tanner, Peter; Hingorani, RamonAcceptable risks to persons associated with building structuresStructural Concrete3/2015314-322Technical Papers

Kurzfassung

In routine engineering practice, the risks associated with safety considerations addressed when designing new or assessing existing structures are not quantified and the corresponding acceptance criteria may diverge widely. Although the use of explicit risk analysis methods to quantify structural safety would therefore deliver significant benefits, the implementation of such methods is hindered by a series of technical and administrative obstacles.
The present study explores methods and tools for the practical application of explicit risk analysis methods. Structure-related risks to persons are established on the grounds of the probability of structural failure and its consequences in terms of loss of human life. The procedure adopted is applied to a representative set of building structures. Acceptance criteria for risks to persons associated with such structures are deduced from the findings. These criteria provide a rational basis for decision-making in structural engineering. They may be used in explicit risk analysis or as a basis for the consistent calibration of simplified models for determining partial factors in the design of new or assessment of existing structures.

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Steenbergen, Raphaël D. J. M.; Sýkora, Miroslav; Diamantidis, Dimitris; Holický, Milan; Vrouwenvelder, TonEconomic and human safety reliability levels for existing structuresStructural Concrete3/2015323-332Technical Papers

Kurzfassung

Specifying the target reliability levels is one of the key issues in the assessment of existing structures. For a majority of existing buildings and infrastructures, the design life has been reached or will be reached in the near future. These structures need to be reassessed in order to verify their safety. Eurocodes provide a general basis primarily intended for the design of new structures, but the basic principles can be used for assessing existing buildings, too. Reliability levels are generally based on both economic optimization and criteria for human safety. In this study, both methods are elaborated for existing structures. It appears that the requirement for the same target reliability for existing and new structures is uneconomical. Further, cost optimization seems to yield rather low reliability levels and human safety criteria often become the critical factor. The study concludes with practical guidelines for establishing reliability indices for existing structures linked to Eurocode principles.

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