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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Brune, Bettina; Peköz, Teoman Design of cold-formed steel members - comparison of EN 1993-1-3 and Direct Strength Method Steel Construction 2/2013 82-94 Articles

Kurzfassung

This paper compares the design concepts for cold-formed steel members according to the European standard EN 1993-1-3 [22] and the Direct Strength Method (DSM) according to Appendix 1 of the AISI specification [3]. References to where the two approaches are described are followed by comparative analyses focusing on the fundamental design concepts, the design procedure, strength curves, opportunities and limits to their application. The paper points out similarities and differences, difficulties and opportunities. Channel section design examples are used to compare the different approaches. Current and ongoing research to extend the standards is summarized to show the future possibilities.

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Tilburgs, Kees Those peculiar structures in cold-formed steel: ?racking & shelving? Steel Construction 2/2013 95-106 Articles

Kurzfassung

One of the applications of cold-formed steel in which a considerable tonnage is involved is corrugated steel sheets for wall and roof cladding. Another is racking and shelving (R
Considering the non-traditional R
For the cold-formed members and components typically used in R
This paper gives an impression of R

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Kathage, Karsten; Lindner, Joachim; Misiek, Thomas; Schilling, Sivo A proposal to adjust the design approach for the diaphragm action of shear panels according to Schardt and Strehl in line with European regulations Steel Construction 2/2013 107-116 Articles

Kurzfassung

In Germany the stiffness and resistance of diaphragms used for stabilizing members are traditionally calculated according to the Schardt and Strehl approach. Compared with the approach of Bryan and Davies given in the ECCS Recommendations, it does not take into account the flexibility of the connections. This paper shows how to amend Schardt and Strehl’s approach to include this flexibility, leading to more realistic values of diaphragm stiffness. The article also introduces new procedures for the calculation of the resistance, adopted from European standards and recommendations. Finally, both a test and an example taken from the literature are recalculated for comparison.

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European steel market 2012 Steel Construction 2/2013 116 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Camotim, Dinar; Basaglia, Cilmar Buckling analysis of thin-walled steel structures using generalized beam theory (GBT): state-of-the-art report Steel Construction 2/2013 117-131 Articles

Kurzfassung

This paper addresses the use of generalized beam theory (GBT) to analyse the local and global buckling behaviour of thin-walled steel members and structural systems. After a brief historical perspective of GBT developments, the main concepts and procedures involved in performing buckling analyses are summarized in a systematic fashion. That is followed by a state-of-the-art report concerning the most recent GBT formulations and applications that have been developed to assess the buckling behaviour of members, frames and trusses with various loading and support conditions. In order to illustrate the unique modal features and show the potential of the GBT approach to buckling analysis, numerical results and a few practical applications are presented and discussed; for validation purposes, most of these results are compared with values yielded by shell finite element analyses, performed in the ABAQUS and ANSYS programs. The paper closes with a few words on the future perspectives of GBT-based buckling analysis.

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Third International Conference "High Strength Steels for Hydropower Plants - Design Concepts - Pressure Conduits" Steel Construction 2/2013 131 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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Roure, Francesc; Somalo, Maria Rosa; Casafont, Miquel; Pastor, Maria Magdalena; Bonada, Jordi; Peköz, Teoman Determination of beam-to-column connection characteristics in pallet rack structures: a comparison of the EN and ANSI methods and an analysis of the influence of the moment-to-shear ratios Steel Construction 2/2013 132-138 Articles

Kurzfassung

Keine Kurzfassung verfügbar.

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Nagy, Zsolt; Gîlia, Lucian; Ballok, Robert Romanian application of cold-formed steel beams with screwed corrugated webs Steel Construction 2/2013 139-143 Articles

Kurzfassung

Cold-formed steel members are used in a wide variety of applications, both residential and industrial, due to their high strength-to-weight ratio. This paper introduces an innovative steel structural solution used in a portal frame configuration. The frame is made from cold-formed steel beams with screwed corrugated web and SHS columns. Very good structural performance was achieved, proved by way of tests on such beams carried out previously at the Technical University of Cluj-Napoca
A finite element analysis was carried out in Abaqus using available, accurate, test-based calibrated FE models [1]. The same settings, mesh size, contacts, connectors and material definitions were used. Material stress-strain curves obtained from coupon tests and a theoretical curve were determined; both types were used in the FE analysis for the definition of the material. A monotonic test will be performed on the proposed structural configuration. The paper concludes with advice on how to set up theoretical stress-strain curves for design assisted by FEA of such kinds of girder. A case study presents one particular proposed structure, analysed by the authors and built for a warehouse application.

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Lessons to be learned: EUROFER on 2030 climate and energy policies framework Steel Construction 2/2013 143 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Leach, Philip; Weekes, Laurence Axial capacity of perforated steel columns Steel Construction 2/2013 144-149 Articles

Kurzfassung

A research group has recently been formed at the University of Salford with the general aim of investigating lightweight structures. The first task of the group is to look at the behaviour of perforated steel columns used for storage racking.
The steel columns used in storage racking are made from perforated light gauge steel, with the perforations facilitating the connection of the storage racking beams. Recent work by Casafont et al. [1] has investigated the axial capacity of such members by a combination of testing and calculation, whereas another approach has been reported by Dinis et al. [2].
This paper describes the initial work of the group, investigating the possibility of assessing such capacity by using Eurocode 3 [3] equations to calculate the failure load of the column, using a critical buckling load that allows for the perforations in the column [4]. Critical buckling loads are calculated using both generalized beam theory and finite element analysis.
The use of generalized beam theory is illustrated for problems of varying complexity, from a very simple uncoupled solution with one equation up to the final coupled finite difference eigenvalue solution.
The paper concludes that it is currently possible to predict the capacity within a 15 % margin, and that further work could indeed improve this.

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ISISE report 2010-2012 is now available Steel Construction 2/2013 149 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Puthli, Ram; Packer, Jeffrey A. Structural design using cold-formed hollow sections Steel Construction 2/2013 150-157 Articles

Kurzfassung

This paper reviews the differences between the alternative types of structural hollow section products (cold-formed versus hot-finished) as they affect structural design in Europe, using the relevant product and design standards, with an emphasis on Rectangular Hollow Sections (RHS). Manufacturers of cold-formed structural hollow sections (CFSHS) are more numerous, so that their products are more widely available. Hot-finished structural hollow section (HFSHS) products are typically between 24 % and 54 % more expensive in Germany than their cold-formed counterparts, the lower differences being for large tonnages - a strong inducement in favour of CFSHS. The price difference may also vary within the European Union. The geometric and product properties which are distinctly unique to CFSHS are presented and shown to offer no restrictions in their use when in compliance with the appropriate clauses in the European standards. These are the influence of corner radii, welding in the corner area, material choice to avoid brittle fracture and suitability for welding CFSHS. A comparison of the structural performance of CFSHS and HFSHS shows equally efficient structural designs for both products. The points covered are the design of compression members - unfilled and concrete-filled, joint resistance - which typically governs selection of member sizes, as well as fatigue design, fire design and the resistance of braced steel frames to severe seismic loading. CFSHS are shown to be adequate under all these situations.

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January 2013 crude steel production Steel Construction 2/2013 157 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Korbelá , Jaroslav; Kroupar, Miroslav; Ryjácek, Pavel; Schindler, Jiri Steel superstructure saves concrete arch bridge over the River Ohre, Czech Republic Steel Construction 2/2013 158-162 Reports

Kurzfassung

This paper describes the design and construction of the unique widening of a concrete arch bridge over the River Ohe using a lightweight steel superstructure. The bridge reconstruction formed part of the wider reconstruction measures for road I/6, including its upgrade from a two- to a four-lane highway, near Loket between Nové Sedlo and Sokolov in the north-west of the Czech Republic. Details of the erection of the steel structure and the strengthening of the concrete arch and piers are also given.

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Anistoroaiei, Christian; Heymel, Ulrich; Jung, Rolf; Sagner, Michael Erik Bridge across the Lochkov Valley, Prague Ring Road - a strutted frame construction of a special kind Steel Construction 2/2013 163-170 Reports

Kurzfassung

This bridge, which connects Slivenec with Lahovice, is the project that completes the highway bypass south of Prague, in the Lochkov Valley. The bridge structure is 425.3 m long, 35 m wide and reaches a maximum height of almost 65 m. From both the architectural and engineering points of view, the bridge is an unusual design, with a curved composite structure supported by inclined concrete piers in the central span.

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Announcement: Steel Construction 2/2013 Steel Construction 2/2013 170 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 2/2013 Steel Construction 2/2013 171-174 ECCS News

Kurzfassung

Conferences
Announcements
Technical Committees (TC) activities
TC News
ECCS News

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Puthli, Ram Professor Jacob Wardenier reaches 70 Steel Construction 2/2013 175 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Pirttijoki, Janne Pekka Ritakallio retired Steel Construction 2/2013 175-176 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 2/2013 Structural Concrete 2/2013 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Curbach, Manfred Concrete light - possibilities and visions Structural Concrete 2/2013 87-88 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Corres-Peiretti, Hugo Sound engineering through conceptual design according to the fib Model Code 2010 Structural Concrete 2/2013 89-98 Technical Papers

Kurzfassung

Conceptual design is the approach that creates an idea in order to find a solution to a new proposal for a structure or solve a detail in a specific structure. It is a personal approach that is learned over time and with experience. It is not normally dealt with at university, but is vitally important for producing sound structures.
The fib Model Code for Concrete Structures 2010 introduced this concept in the first section of chapter 7 “Design”. The content of that section explains the general approach to developing conceptual design.
This paper will show different examples of conceptual design following the general guidelines stated in the Model Code.

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Balázs, György L.; Bisch, Philippe; Borosnyói, Adorján; Burdet, Olivier; Burns, Clare; Ceroni, Francesca; Cervenka, Vladimir; Chiorino, Mario A.; Debernardi, Piergiorgio; Eckfeldt, Lars; El-Badry, Mamdouh; Fehling, Ekkehard; Foster, Stephen J.; Ghali, Amin; Gribniak, Viktor; Guiglia, Matteo; Kaklauskas, Gintaris; Lark, Robert J.; Lenkei, Peter; Lorrain, Michel; Marí, Antonio; Ozbolt, Josko; Pecce, Marisa; Pérez Caldentey, Alejandro; Taliano, Maurizio; Tkalcic, Damir; Torrenti, Jean Michel; Torres, Lluis; Toutlemonde, François; Ueda, Tamon; Vitek, Jan L.; Vráblík, Luká Design for SLS according to fib Model Code 2010 Structural Concrete 2/2013 99-123 Technical Papers

Kurzfassung

This paper provides an overview of serviceability specifications given by the fib Model Code for Concrete Structures 2010 (fib MC2010 [1]). First, the reasons behind crack control and deflection control are discussed, then specific design rules are provided. Simple rules as well as detailed models are also presented. Numerical examples are provided in order to assist in the application of the design recommendations for crack control and deflection control (reinforced and prestressed concrete elements).
Simple rules mean indirect control of cracking or deflections without calculations. Indirect crack control may include limitation of stresses and selection of maximum bar diameter or maximum bar spacing. Indirect deflection control normally means limiting the span-to-depth ratio.
Detailed models are based on physical and mathematical approaches to cracking and deflections. The design crack width is expressed as the maximum bond transfer length multiplied by the mean strain between cracks. Deflection analysis can be provided by integrating curvatures or by using a simplified or refined method. Vibrations and numerical modelling of cracking are also briefly discussed.

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Tailhan, Jean-Louis; Boulay, Claude; Rossi, Pierre; Le Maou, Fabrice; Martin, Eric Compressive, tensile and bending basic creep behaviours related to the same concrete Structural Concrete 2/2013 124-130 Technical Papers

Kurzfassung

This paper concerns the relationship between compressive, tensile and flexural creep behaviours related to the same concrete. Experimental tests and a numerical simulation are performed in the scope of this work. The main conclusion of this study is that due to the strong scale effect related to the tensile and bending creep behaviours of a “standard” concrete mix design, it is not possible to simulate numerically (with classical Kelvin-Voigt chains) the bending creep behaviour of that type of concrete knowing the compressive and tensile creep behaviours obtained using the specimen geometries normally used in laboratories.

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Seo, Tae-Seok; Kim, Jung-Chul Behaviour of concrete in a stress continuity region after cracking under restrained drying shrinkage Structural Concrete 2/2013 131-137 Technical Papers

Kurzfassung

Some studies have investigated the time-dependent characteristic of concrete for predicting stress under restrained shrinkage. However, these studies investigated the shrinkage behaviour of concrete in restrained conditions before cracking, and no study has yet investigated the behaviour of concrete due to restrained shrinkage in the stress continuity region after cracking. Therefore, this study investigates the shrinkage behaviour of concrete in the stress continuity region after cracking in uniaxial restrained specimens and analyses the restrained tensile stress of concrete in this region by way of a bond analysis. The results show that the effective tensile Young's modulus considering tensile creep is approx. 22-26% of the static modulus of elasticity. Moreover, the analytical results of the restrained tensile stress of concrete considering the effective tensile Young's modulus were in accordance with the experimental results.

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