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Herbert Kupfer gestorbenStahlbau2/2014146Persönliches

Kurzfassung

Keine Kurzfassung verfügbar.

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Ummenhofer, ThomasPeter Knödel 60 JahreStahlbau2/2014146-147Persönliches

Kurzfassung

Keine Kurzfassung verfügbar.

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Feldmann, MarkusBenno Hoffmeister zum außerplanmäßigen Professor ernanntStahlbau2/2014147Persönliches

Kurzfassung

Keine Kurzfassung verfügbar.

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Termine: Stahlbau 2/2014Stahlbau2/2014147-148Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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Content: Steel Construction 2/2014Steel Construction2/2014Content

Kurzfassung

Keine Kurzfassung verfügbar.

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Ummenhofer, ThomasStructural hollow sections - recent developmentsSteel Construction2/201463-64Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Zhao, Xiao-Ling; Heidarpour, Amin; Gardner, LeroyRecent developments in high-strength and stainless steel tubular members and connectionsSteel Construction2/201465-72Article

Kurzfassung

This paper reports on recent developments in high-strength and stainless steel tubular members and connections. It includes carbon steel tubes with a yield stress up to 1350 MPa and stainless steel tubes. The paper describes high-strength tubes in terms of residual stresses, material properties at elevated temperatures, member behaviour, welded connections under static loading, fatigue strength of welded connections, fabricated sections utilizing high-strength steel tubes and stainless steel tubular members and connections.

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BEIJING ESSEN WELDING & CUTTING 2014 takes place 10-13 June 2014Steel Construction2/201472News

Kurzfassung

Keine Kurzfassung verfügbar.

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Elghazouli, Ahmed Y.; Packer, Jeffrey A.Seismic design solutions for connections to tubular membersSteel Construction2/201473-83Articles

Kurzfassung

A review of seismic design solutions for connections is presented in this paper, with particular focus on methods that are already “pre-approved” or “acceptable to code” for use by engineers in steel-framed structures using hollow sections. This review is intended to illustrate the limited options currently available to structural engineers. The survey mainly covers European and North American design solutions, but the latter are also heavily influenced by Japanese practice. The scope includes both braced frame connections (utilizing hollow sections for the bracing members at least) and unbraced frame connections (utilizing hollow section columns), the latter including both rigid and semi-rigid beam-to-hollow section column connections. Dissipative and non-dissipative connection types are considered where appropriate. Emphasis is placed on connection configurations and concepts rather than detailed design information, but references to other sources are given for further details. Areas in which there is a paucity of established design guidance are noted, and the review concludes with recommendations for further research and development regarding specific types of connections to hollow sections subjected to seismic loading.

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Marshall, Peter; Thang, VulRadical proposals for hotspot stress designSteel Construction2/201484-88Articles

Kurzfassung

Drafts of the AISC guide for hotspot stress contained several radical technical proposals that could benefit from exposure and peer review before publication in the design guide. These are:
- S-N slope of -1/3.6 with no transition knee,
- notch stress size effect based on mesh density, and
- thickness-dependent strain limits for TxT meshing.
These proposals are presented here along with their supporting data.

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Kurrer, Karl-EugenBibliotheca Mechanico-Architectonica (BMA)Steel Construction2/201488Book review

Kurzfassung

Keine Kurzfassung verfügbar.

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Wardenier, Jaap; Choo, Yoo Sang; Packer, Jeffrey A.; van der Vegte, Gerhardus J.; Shen, WeiDesign recommendations for axially loaded elliptical hollow section X and T jointsSteel Construction2/201489-96Articles

Kurzfassung

This paper presents a summary, with background information, of the design recommendations developed recently for axially loaded X and T joints between elliptical hollow sections (EHS). These recommendations are based on experimental tests, finite element (FE) calibration and parametric studies carried out in a collaborative research programme between the universities of Singapore, Toronto and Delft.
The strength equations are presented in a similar manner to those currently adopted for circular hollow section (CHS) joints and rectangular hollow section (RHS) joints in ISO 14346 (2013). The ISO recommendations are based on, and are similar to, those of the International Institute of Welding, IIW-XV-E, which were also published by the Comité International pour le Développement et l’Etude de la Construction Tubulaire (CIDECT) in recent editions of their Design Guides.

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J. van der Vegte, Gerhardus; Wardenier, JaapEvaluation of the recent IIW (2012) and ISO (2013) strength equations for axially loaded CHS K gap jointsSteel Construction2/201497-106Articles

Kurzfassung

Over the last decade, extensive numerical analyses have been conducted on axially loaded uniplanar K gap, T and X joints made of circular hollow sections (CHS), considering a wide range of geometrical parameters and different types of chord load. Based on the large amount of numerical data, in 2007, new joint capacity and chord stress equations were derived for CHS joints. This article presents detailed comparisons made between the (mean) strength equations for K gap joints and the experimental data available. These design equations were first discussed and approved by Sub-commission XV-E of the International Institute of Welding (IIW), subsequently published in the CIDECT Design Guide for CHS joints [1] and adopted in the 3rd edition of the IIW Static Design Procedure for Welded Hollow Section Joints [2], which formed the basis for the ISO 14346 recommendations [3] published recently.

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Shopping center in Columbia with membrane-foil roofsSteel Construction2/2014106News

Kurzfassung

Keine Kurzfassung verfügbar.

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Ritakallio, Pekka; Björk, TimoLow-temperature ductility and structural behaviour of cold-formed hollow section structures - progress during the past two decadesSteel Construction2/2014107-115Articles

Kurzfassung

Cold-formed hollow sections are a widely used tubular construction material. The applicability, weldability and reliability of cold-formed rectangular hollow sections are sometimes questioned because of the consequences of cold forming and inhomogeneous cross-sections. One of the main concerns is related to the cold-formed corner areas and possible loss of toughness due to strain ageing in the vicinity of the welds. Conventional hot-rolled C-Mn steels are susceptible to strain ageing, and Eurocode 3 includes restrictions on welding in the cold-formed corner area. Both steelmaking and hot rolling have undergone crucial developments and this has had an impact on cold-formed hollow sections. Thermomechanically rolled fine-grain steels became state of the art at the end of the 1990s. This study confirms that cold-formed EN 10219 hollow sections made of suitable fine-grain steels have a similar Charpy-V toughness on the flat face and in the corner, and that even after ageing the transition temperature T40J in the corner area is at a very low level, typically below -50 °C. The load and deformation capacities of X- and K-joints fulfil the requirements without any noticeable ageing effects. The advances in steelmaking and hot rolling enable the manufacturing of reliable and versatile cold-formed EN 10219 hollow sections for welded structures with good low-temperature ductility even in the cold-formed corner area.

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Abspoel , Roland; Bijlaard, FransOptimization of plate girdersSteel Construction2/2014116-125Articles

Kurzfassung

The costs of the self-weight of a structure have never been a real issue in the design of steel girders, since the material costs of a structural element are mainly determined by labour costs. The booming economies of China and India cause a continuously increasing demand for steel. This and the now stringent regulations regarding sustainability make material economy in design much more interesting.
In a material economy-driven plate girder design, the lever arm between the flanges will increase. This leads to a higher stiffness and bending moment resistance, but also to an increase in the web slenderness of the girder. This means that high-strength steels can be used, leading to a large reduction in steel consumption.
Eurocode 3, EN-1993-1-5, [1] restricts the web slenderness based on the formula to avoid flange-induced buckling, originally derived by Basler [2]. However, experimental and theoretical research conducted on 10 unstiffened plate girders with high web slenderness ratios at the Stevin II Laboratory of Delft University of Technology shows that this formula is too conservative.
This paper presents the results of this research and suggestions for a new plate girder design strategy.

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Raw Materials Improvement Report availableSteel Construction2/2014125News

Kurzfassung

Keine Kurzfassung verfügbar.

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Lipp , Andreas; Ummenhofer, ThomasInfluence of tensile chord stresses on the strength of circular hollow section jointsSteel Construction2/2014126-132Article

Kurzfassung

The current version of the Eurocode for the design of joints does not include any brace load capacity reduction for welded hollow section joints with tensile chord preloading as opposed to those without. However, the more recent 2nd edition of the CIDECT design guides or the ISO standard for welded hollow section joints includes a strength reduction due to tensile chord stresses. This paper presents the results of experimental and numerical investigations into how tensile chord stresses influence the capacity of circular hollow section X-joints. The conclusion of this study is a new chord load function proposal for circular hollow section joints subjected to tensile chord stresses.

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Kurrer, Karl-EugenThe History of Theoretical, Material and Computational Mechanics - Mathematics meets Mechanics and Engineering. From E. Stein (ed.)Steel Construction2/2014132Book review

Kurzfassung

Keine Kurzfassung verfügbar.

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Gresnigt, A. M. (Nol); Karamanos, Spyros A.Response of steel tubes under concentrated lateral loadsSteel Construction2/2014133-140Article

Kurzfassung

Steel tubes may be loaded by concentrated lateral loads such as support or impact loads. Impact loading, for example, is an important load case for buried pipelines that are struck during excavation activities, or large-diameter tubes during transportation (handling accidents). This paper presents an analytical model based on shell theory to determine the elastic-plastic load deformation behaviour. Test results are given as well as the results of finite element calculations. The finite element results and the model equations are in good agreement with the experimental results and illustrate the tube denting response.

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March 2014 crude steel productionSteel Construction2/2014140News

Kurzfassung

Keine Kurzfassung verfügbar.

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Helbig, Thorsten; Kamp, Florian; Oppe, MatthiasLazika Pier Sculpture - A crossover from sculpture to structureSteel Construction2/2014141-146Reports

Kurzfassung

Lazika is a new city in Georgia located on the Black Sea coast. The one-hundred meter long Lazika Pier with its 31 m high landmark sculpture is one of the first structures to mark the beginning of the development of this new metropolis.
The sculpture designed by German architect Jürgen Mayer H. consists of stacked oval elements - so called blobs - organized in seven levels. The blobs are subdivided into vertical plain levels running in an orthogonal direction with a distance of 90 cm. Due to the exposed position, tough requirements concerning corrosion resistance and a pretty tight timetable for design, fabrication and erection, structural steel has been chosen as the building material. The sculpture consists of steel plates with varying thicknesses of 5 to 10 mm. Elements composed of plasma-cut plates were pre-fabricated within a site workshop and installed using mobile cranes. Exterior and interior lighting features provide a dynamic and pulsating look to the sculpture.

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Pfeiffer, Esther; Kern, AndreasModern production of heavy plates for construction applications - controlling production processes and qualitySteel Construction2/2014147-153Reports

Kurzfassung

Modern steel and pressure vessel construction requires heavy plates with tailored properties. In addition to satisfying quality standards, delivery on schedule is an important requirement for building projects. To show how these demands on actual deployment of plates are realized, this paper discusses methods for optimum production planning and production control where the focus is upon improving the flow of work, thus gradually eliminating unevenness across the system to realize the demands. Owing to the complexity of the heavy plate production process, computer-based modelling of material flow processes is presented as a suitable tool. In addition, important aspects of quality assurance and quality control during the production of high-performance plates are summarized. The quality characteristics of the plates are suitable surface quality, flatness, dimensional accuracy und mechanical and technological properties. How these features are controlled during the production of heavy plates is presented systematically.

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Göppert, Knut; Haspel, Lorenz; Waldner, DanyMobile pavilions for the fairground of the BASELWORLD - The world's leading watch and jewellery show BASELWORLD has been given a new lookSteel Construction2/2014154-157Reports

Kurzfassung

Most stands at last year’s BASELWORLD as well as the fairground have been fundamentally redesigned: Six crystalline pavilions that house food service, media relations and ticket office string through a mosaic of blooming flower beds. Together with the architectural practice dany waldner AG, schlaich bergermann und partner developed a modular system for mobile buildings that feature a quick and easy installation for versatile use while meeting high design requirements. Functional but elegant detailing was required starting with wide span customized multi-functional aluminium girders carrying the roof membranes, incorporating invisible stressing devices for the membrane, attachments of secondary girders, facade columns and facade panels as well as electrical power supply for the integrated illumination. Laminates of glass panes and varying metallised textiles were used to clad the facade panels made of light weight aluminium frames and connected with integrated connection devices. The structure is resting on legs adjustable in height and adaptable to varying inclination of the ground, requiring a series of movable parts to be designed for multi use, long term performance and corrosion resistance free of lubrication. Combining the advantages of stainless steel, bronze, aluminium and black steel in the strict content of requirements made the project a challenge somewhere between civil and mechanical engineering.

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People: Steel Construction 2/2014Steel Construction2/2014157-159People

Kurzfassung

Darko Beg (1954-2014)
Ram Puthli 70 years

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