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Stahlbau-Symposium anlässlich des 60. Geburtstages von Professor Hartmut Pasternak Stahlbau 2/2015 157-158 Veranstaltungen

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Keine Kurzfassung verfügbar.

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Aktuell: Stahlbau 2/2015 Stahlbau 2/2015 158-159 Aktuell

Kurzfassung

Stahlbauforum 2015 - Forschung trifft Praxis
Neue Betriebssicherheitsverordnung für Druckbehälter- und Kälteanlagen
Georg-Donges-Förderpreis 2014 verliehen

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Termine: Stahlbau 2/2015 Stahlbau 2/2015 159-160 Termine

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Keine Kurzfassung verfügbar.

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Content: Steel Construction 2/2015 Steel Construction 2/2015 Content

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Keine Kurzfassung verfügbar.

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Kuhlmann, Ulrike; Zandonini, Riccardo Slim floors - a chance for high permance Steel Construction 2/2015 77-78 Editorial

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Keine Kurzfassung verfügbar.

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Lam, Dennis; Dai, Xianghe; Kuhlmann, Ulrike; Raichle, Jochen; Braun, Matthias Slim-floor construction - design for ultimate limit state Steel Construction 2/2015 79-84 Articles

Kurzfassung

This paper presents the design method for slim-floor construction that comprises a steel beam and a concrete or composite floor slab in which the beam is integrated within the depth of the slab. The slabs are either supported on a plate attached to the bottom flange or the bottom flange of the beam itself. The main design parameters and load transfer mechanisms are discussed. Plastic analysis has been adopted for the design of the bending capacity at the ultimate load condition and the design procedures described are in accordance with the principles given in Eurocode 4. Attention is paid to the type of shear connection between steel and concrete.

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Lawson, Mark; Beguin, Philippe; Obiala, Renata; Braun, Matthias Slim-floor construction using hollow-core and composite decking systems Steel Construction 2/2015 85-89 Articles

Kurzfassung

This article reviews the performance characteristics of and some recent developments in slim-floor and integrated beam construction. This form of construction provides a flat floor using precast concrete slabs or deep composite decking and offers advantages over other forms of construction in many sectors. Composite slim-floor beams have superior stiffness and can achieve longer spans.

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Mike Schlaich awarded Gold Medal by The Institution of Structural Engineers Steel Construction 2/2015 89 News

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Keine Kurzfassung verfügbar.

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Leskela, Matti V.; Peltonen, Simo; Obiala, Renata Composite action in shallow floor beams with different shear connections Steel Construction 2/2015 90-95 Articles

Kurzfassung

Shallow floor beams, abbreviated to SF beams and also known as slim floor beams, are beams where most of the beam member is embedded in the concrete decking of the floor, which is supported on the lower flange or outward ledge of the beam. SF beams are composite members in which composite action can be utilized in both the serviceability and ultimate limit state conditions or only at the serviceability limit state, depending on the decking type. This paper discusses the composite action in SF beams when the decking is of a solid type, i.e. consists of a reinforced concrete slab or composite slab with profiled sheeting, making it possible to benefit from the composite behaviour at all important limit states. Hollow-core decking supported on SF beams is a special case in which the composite action can only be employed in the design for serviceability conditions. Another paper covers the special issues regarding the design of such shallow floors.

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Hauf, Gunter; Kuhlmann, Ulrike Deformation calculation methods for slim floors Steel Construction 2/2015 96-101 Articles

Kurzfassung

Slim-floor structures combine the advantages of prefabricated slab elements with steel-frame construction and lead to economic building solutions fulfilling the demands of modern architecture in combination with transparent structural envelopes without intervening columns as well as implicit flexibility for sustainable construction. Over past years, new slim-floor solutions have been developed to broaden the market for composite structures when compared with conventional concrete flat slabs. However, due to the shallow depth of composite slim-floor girders, their structural response, especially their deflection behaviour, differs from normal composite girders. The concrete is already in the cracked condition under service loads in regions of sagging bending moments. The contribution of the concrete chord to the effective moment of inertia Ii,0 of the composite cross-section and the bending moment Mc in the concrete chord are not negligible for the total loadbearing capacity of the composite section. These two effects are not normally considered when calculating the deflections of composite girders based on the effective width given in codes such as EN 1994-1-1 [1]. Therefore, the following paper will show different methods for calculating the deflection of these shallow types of composite girder.

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Romero, Manuel L.; Cajot, Louis-Guy; Conan, Yves; Braun, Matthias Fire design methods for slim-floor structures Steel Construction 2/2015 102-109 Articles

Kurzfassung

Slim-floor beams are well-known, sustainable and economical solutions for residential, commercial and industrial buildings. However, despite their widespread use, Eurocode 4 contains no specific simplified calculation methods for the fire resistance of integrated and shallow floor beams. There is a clear need for an improved understanding of the performance of structures in fire plus clear and cost-effective design guidance. This paper presents a set of simplified rules for determining thermal fields in the lower flange, web, rebars and slab of slim or integrated floor beams. This calculation methodology is based on existing formulas taken from different parts of Eurocode 4 except for the temperature calculation in the lower flange, which is deduced from a parametrical study using the SAFIR software.

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New technology paves the way for greener steel Steel Construction 2/2015 109 News

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Keine Kurzfassung verfügbar.

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Hicks, Stephen; Peltonen, Simo Design of slim-floor construction for human-induced vibrations Steel Construction 2/2015 110-117 Articles

Kurzfassung

This paper presents a simplified design method for evaluating the vibration response of composite floors with slim-floor beams. The methodology is amenable to hand calculations and is appropriate for floors with regularly spaced grids and vibrations that are occasioned by walking activities. From in situ tests that have been undertaken on six floors, it is shown that slim-floor construction can easily satisfy the demanding ISO 10137 response limits for operating theatres and laboratories together with limits recommended by industry for car parks and shopping malls. Comparisons with measurements show that the simplified method presented here provides conservative predictions, and may therefore be used with confidence in design.

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Leskela, Matti V.; Peltonen, Simo Effect of unzipping connection behaviour on the composite interaction of shallow floor beams Steel Construction 2/2015 118-121 Articles

Kurzfassung

Unzipping connection behaviour is not referred to in EN 1994-1-1 - only ductile and non-ductile shear connections are classified. It might be clear that unzipping connections belong to the non-ductile ones, but not all the non-ductile connections are unzipping ones. Characteristic of unzipping connection behaviour is that, initially, connection stiffness is high and composite action is efficient. However, as the load increases, so the connection loses its shear stiffness very rapidly, and after the onset of plastic behaviour in the beam, the decking no longer contributes to the bending resistance of the initially composite member. This behaviour is most typically seen in shallow floor beams (abbreviated to SF beams) supporting hollow-core decking. This is a companion paper to the one in which the composite action in SF beams with ductile shear connections is discussed.

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Kuhlmann, Ulrike; Just, Adrian; Leitz, née Froschmeier, Bernadette; Grabe, Jürgen; Schallück, Christoph Simplified criteria and economic design for king piles in combined steel pile walls according to Eurocode 3, part 1-1 Steel Construction 2/2015 122-132 Articles

Kurzfassung

The steady growth in world trade leads to a demand for more port and harbour facilities. One of the most common forms of construction for deep-water harbour quays is the combined steel pile wall. It consists of up to 45 m long H-section king piles plus Z-section intermediate sheet pile infill elements. The intermediate elements and the quay both transfer all forces to the king piles, which as a result are loaded with (bi)axial bending and axial force, so their stability must be checked. Up to now the effect of the soil surrounding the piles was used just in terms of best practice - buckling about the weak axis and lateral torsional buckling were neglected completely. Considering these stability phenomena in design without taking the soil into account would lead to a very conservative approach. As verification of lateral torsional buckling according to EN 1993-1-1 (EC3-1-1) becomes relevant when the embedment is neglected, a more refined analysis has been developed.
This article presents simplified criteria that quickly exclude stability phenomena (flexural buckling about the weak axis and lateral torsional buckling) while taking into account the effects of the soil. For the cases in which the criteria are not fulfilled, the article presents economic solutions that consider the embedment of the king piles in the soil in the design for stability.

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Eleventh edition of the Edoardo Benvenuto Prize Steel Construction 2/2015 132 News

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Keine Kurzfassung verfügbar.

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Helbig, Thorsten; Kamp, Florian; Oppe, Matthias An Eye to the Sky - Inclined grid shell dome of 90 m in Astana, Kazakhstan Steel Construction 2/2015 133-138 Report

Kurzfassung

A 6500 m² glazed grid shell dome covers the Nazarbayev Centre in Astana, Kazakhstan. Located near the Presidential Palace, this futuristic building, designed by Foster Partners in London, is one of a whole series of prominent architectural buildings in Astana.
The 20° inclined glass roof spans across various levels of the reinforced concrete structure and slopes down to the north. The dome has a span of over 90 m and a rise of about 11 m. A sufficient in-plane stiffness of the rectangular grid of the dome is achieved by the rigidly connected rectangular hollow sections, which are framed by a strong circumferential edge beam. Connections of the grid and edge beam are bolted mainly as a means to cope with the ambitious time schedule that required fast erection during the strong Kazakh winter. By means of a statically determined support, the roof grid and edge beam of the glazed dome remain largely independent of the concrete structure’s long-term and deformation behavior. A major issue for the roof structure was the verification of global buckling of the dome. In order to minimize tolerances, all connection surfaces of bolt joints were CNC milled. This article summarizes the design philosophy of the dome steel grid and the relationship between glazed dome and main concrete structure.

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News: Steel Construction 2/2015 Steel Construction 2/2015 138 News

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The DVS EXPO will focus on robotics and virtual welding trainers
Upgrade for Hot Strip Mill in Port Talbot

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ECCS News: Steel Construction 2/2015 Steel Construction 2/2015 139-142 ECCS News

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Events
Announcements
Technical Committees (TC) activities
TC News

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Stadsbrug Nijmegen: a beauty with waves and curves Steel Construction 2/2015 142-143 News

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Keine Kurzfassung verfügbar.

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Schlaich, Jörg Hyperbolic structures. Shukhov's Lattice Towers - Forerunners of Modern Lightweight Construction. From Beckh, M. Steel Construction 2/2015 143-144 Book review

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Keine Kurzfassung verfügbar.

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Announcement: Steel Construction 2/2015 Steel Construction 2/2015 144 Announcement

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Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 2/2015 Structural Concrete 2/2015 Contents

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Keine Kurzfassung verfügbar.

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Andrade, Carmen Modelling the concrete-real environment interaction to predict service life Structural Concrete 2/2015 159-160 Editorial

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Keine Kurzfassung verfügbar.

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Kromoser, Benjamin; Kollegger, Johann Pneumatic forming of hardened concrete - building shells in the 21st century Structural Concrete 2/2015 161-171 Technical Papers

Kurzfassung

Double-curvature shells, used as supporting structures, are strong and save materials. Major parts of the applied loads can be carried by normal forces. Thus, the stresses are distributed very uniformly and efficiently over the entire cross-section, and long spans can be built with small thicknesses. The state of the art in the construction of shell structures is characterized by a high labour input for formwork and falsework. A new construction method without formwork and falsework has been invented at the Institute for Structural Engineering at Vienna University of Technology. The idea of this new construction method is to build concrete shells with a double curvature originating from an initially plane plate. During the transformation process, the hardened concrete plate is lifted and the elements are bent with the aid of pneumatic formwork until the required curvature is reached. Non-linear finite element calculations, tension tests, bending tests and bonding tests were carried out in order to determine a suitable combination of concrete and reinforcement. The second part of the paper describes a large-scale experiment for the erection of a 17.6 × 10.8 m, 2.9 m high free-form shell. Finally, different applications for the new method are explained.

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