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Borjigin, Sudanna; Kim, Chul-Woo; Chang, Kai-Chun; Sugiura, Kunitomo Non-linear seismic response analysis of vehicle-bridge interactive systems Steel Construction 1/2015 2-8 Articles

Kurzfassung

The intention of this study is to investigate how vehicles on highway bridges affect the seismic responses of the bridges under strong ground motions. Most highway bridge design codes do not consider the live load in the seismic design of highway bridges because of the low probability of the two events of the critical live load and an earthquake occurring at the same time. As a result, little attention has been paid to the influence of vehicle loads on the seismic responses of highway bridges. However, considering the high probability of traffic jams on urban roads, it is preferable to examine and clarify the dynamic interaction effect of vehicles on road bridges while subjected to seismic loads. In this study, the vehicle-bridge-ground motion interactions are realized by combining ABAQUS and MATLAB. ABAQUS provides a GUI environment to establish the numerical bridge model and apply the seismic forces, while MATLAB provides a platform to control the iterations in both time and force increments. As a preliminary study, a simplified 3D pier-beam bridge model loaded with multiple vehicles with two degrees of freedom moving at a constant speed has been considered. When subjected to identical, strong seismic loadings, it was observed that the transverse accelerations of the bridge with moving vehicles are smaller than those without moving vehicles. Further, permanent deformation occurs after earthquakes because of yielding at the bottom of the pier; it was observed that the permanent deformations of the bridge with moving vehicles tend to be smaller than those without moving vehicles.

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Tsubomoto, Masahiko; Kawatani, Mitsuo; Mori, Kengo Traffic-induced vibration analysis of a steel girder bridge compared with a concrete bridge Steel Construction 1/2015 9-14 Articles

Kurzfassung

At the preliminary design stage for a highway bridge 81 m long, a three-span continuous girder, including a span of about 30 m, is preferable from the point of construction cost. Generally, the concern is that girder bridges with spans of 30 m, which have a fundamental natural frequency of about 3 Hz, have large traffic-induced vibrations due to the coupling dynamic response with heavy vehicles having a bouncing natural frequency of about 3 Hz. Furthermore, large traffic-induced vibration in girder bridges causes low-frequency sound (LFS) as one of the environmental vibration problems. Two kinds of girder bridge with a length of 81 m - a concrete hollow slab bridge and an eight-girder steel bridge with the same spans - are proposed. For assessing the low-frequency sound radiated from bridges, firstly, the traffic-induced vibrations of two kinds of girder bridge are compared with each other by analysing the coupling dynamic response of bridges due to moving heavy vehicles in a dynamic system.

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Elbe Bridge at Schönebeck wins Structural Award 2014 in the category "Highway or Railway Bridge Structures" Steel Construction 1/2015 14 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Hashimoto, Kunitaro; Kayano, Makio; Suzuki, Yasuo; Sugiura, Kunitomo; Watanabe, Eiichi Structural safety assessment of continuous girder bridge with fatigue crack in web plate Steel Construction 1/2015 15-20 Articles

Kurzfassung

This paper, which focuses on a fatigue crack found in a main girder of a continuous steel girder bridge, assesses the remaining structural safety of the steel bridge with such a fatigue crack in order to judge whether or not urgent action such as closure to traffic or necessary temporary repairs and strengthening should be carried out. Therefore, an elastic-plastic finite displacement analysis is carried out for the continuous three-span non-composite steel girder bridge with four main girders in which a fatigue crack about 1.1 m long in the web plate of the main girder was discovered during an inspection. From the analysis results it is found that the load redistribution function of the multiple main girder system was effective and the remaining load-carrying capacity of such a bridge system is such that there will be no sudden collapse of the entire bridge.

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Kennedy, Stephen J.; Martino, Aldo E. SPS bridge decks for new bridges and strengthening of existing bridge decks Steel Construction 1/2015 21-27 Articles

Kurzfassung

The sandwich plate system (SPS) is a structural composite material made up of two metal plates bonded to a polyurethane elastomer core. SPS delivers high strength and stiffness, making it an excellent alternative to conventional stiffened steel and reinforced concrete. For strengthening of orthotropic bridge decks, SPS Overlay can be used to create a stiff bridge deck without removing the original plates. The renewed deck improves the distribution of wheel loads across the longitudinal stiffening elements, decreases deck curvatures associated with large concentrated wheel loads, extends the fatigue life of fatigue-critical welds and increases the life of the wearing surface and the whole bridge. For new bridge applications, prefabricated SPS bridge deck plates reduce the dead load by up to 70 % compared with concrete bridge decks, thus allowing bridges to carry significantly greater live load without the need for girder or pier strengthening. Deck replacement can be completed while leaving the steel or concrete girders in place or, where speed of erection is critical, pre-assembled longitudinal deck-girder units can be used.

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Lener, Gerhard Steel bridges - numerical simulation of total service life including fracture mechanic concepts Steel Construction 1/2015 28-32 Articles

Kurzfassung

The assessment of the total service life of a steel structure should gain importance in the near future due to the increasing significance of building preservation and building modernization. The main cause of the failure of existing structural steelwork under cyclic loading effects is material fatigue. Most steel structures are, however, failure-tolerant. For economic reasons, this behaviour can be considered by including the crack propagation phase in the assessment. This contribution presents newly developed software tools and the results of some simulations of the total lifetimes of existing structures.

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Mano, Toshihisa; Mangerig, Ingbert Tensile load-carrying behaviour of elastomeric bearings Steel Construction 1/2015 33-41 Articles

Kurzfassung

Elastomeric bearings for seismic isolation applications can be subjected to tensile loads depending on the geometrical configuration, high vertical seismic motion or excessive horizontal deformation due to the elongated-period horizontal motion. It is a known fact that cavities develop within elastomeric material when it undergoes a certain amount of tensile force in a very constrained condition since a high hydrostatic tensile stress builds up. Once these cavities have developed, the tensile stiffness of the bearing drops dramatically. This paper contributes to understanding this phenomenon itself and its influence on the basic properties of elastomeric bearings. For this purpose, two types of elastomeric bearing were tested and the cavitation phenomenon observed. Moreover, those test results are compared with the FE simulation results from the modified hyperelastic material model with the cavity damage criterion. The two-phase softening model presented here can simulate the real softening behaviour of elastomeric bearings well, and it may even help us grasp a better insight into the cavitation phenomenon.

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Prof. Udo Peil awarded honorary doctorate Steel Construction 1/2015 41 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Höglund, Torsten Cold-formed members - comparison between tests and a unified design method for beam-columns Steel Construction 1/2015 42-52 Articles

Kurzfassung

In [1] a unified method for the design of steel beam-columns is presented. The method has been checked for rolled steel beam-columns and extruded aluminium beam-columns. It is included in Eurocode 9 [19] for aluminium members and it is proposed to be included also in Eurocode 3 Part 1-3 [16] as well, but then it needs to be checked for typical cold-formed sections.
Cold-formed sections are usually un-symmetric and thin-walled, for instance channel sections or C-shaped sections (lipped channels). When used as compression members, local buckling causes a redistribution of the longitudinal stress which leads to a shift of the effective centroid. The shift causes overall bending and reduces the column strength when the member is compressed between pinned ends. In fixed-ended columns, however, the shift of the effective centroid is balanced by a shift of the applied force and bending is not introduced [6]. As a result, the strength of fixed-ended channel column exceeds that of a pin-ended column of the same effective length [7].
Using effective width for the flanges of channels e.g. according to EN 1993-1-5 [17] gives conservative result as the centroid of the effective section is too close to the web. The mixed effective width/effective thickness method for outstand elements given in Annex D of EN 1993-1-3 [16] is the basis in the following interpretations.

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Enercon wind turbine erected by Liebherr crane Steel Construction 1/2015 52 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Bedair, Osama An analytical expression to determine "realistic" shear buckling stress in cold-formed lipped channels Steel Construction 1/2015 53-58 Articles

Kurzfassung

Current North American and European design provisions ignore the rotational restraint when evaluating local web shear buckling stresses in cold-formed steel channels. This paper offers a new analytical expression for computing local buckling shear stresses in cold-formed channel members taking into account the rotational restraints imposed by the flanges and the lips. The expression derived is suitable for hand calculations and can replace current code expressions in order to achieve economical steel designs. Comparisons with existing design formulas currently used in practice for the limiting conditions show a difference within 5 %.

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Phänomenta Science Center in Lüdenscheid, Germany Steel Construction 1/2015 58 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Nützel, Oswald; Saul, Reiner Long-term corrosion protection for bridge cables with butyl rubber tapes using the ATIS Cableskin® system Steel Construction 1/2015 59-64 Reports

Kurzfassung

ATIS Cableskin® is a corrosion protection system for bridge cables which uses proven materials to strike out in a new direction. These innovative ideas mean that, for the first time, corrosion protection work on scaffolds and in enclosures will be a thing of the past, and the costs and traffic restrictions are massively reduced. It is worth highlighting the extremely long lifetime of this corrosion protection.

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Winterstetter, Thomas; Alkan, Mustafa; Berger, Radu; Watanabe, Maiko; Toth, Agatha; Sobek, Werner Engineering complex geometries - the Heydar Aliyev Centre in Baku Steel Construction 1/2015 65-71 Reports

Kurzfassung

The present paper describes the engineering design by Werner Sobek for the new Heydar Aliyev Centre in Baku, a masterpiece of 3D freeform architecture by Zaa Hadid.

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EUROFER: Chinese steel imports confuse buyers in Europe as Chinese steel producers exploit the export tax regime Steel Construction 1/2015 71 News

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 1/2015 Steel Construction 1/2015 72-74 ECCS News

Kurzfassung

Events
Announcements
Technical Committees (TC) activities
TC News

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Call for entries: European Steel Design Awards 2015 Steel Construction 1/2015 74-76 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Announcement: Steel Construction 1/2015 Steel Construction 1/2015 76 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS individual membership Steel Construction 1/2015 76 News

Kurzfassung

Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 1/2015 Structural Concrete 1/2015 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Annual table of contents 2014 Structural Concrete 1/2015 Annual table of contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Müller, Harald S. From accomplishments to challenges Structural Concrete 1/2015 1 Message from the fib President

Kurzfassung

Keine Kurzfassung verfügbar.

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Ignatiadis, Anett; Fingerloos, Frank; Hegger, Josef; Teworte, Frederik Eurocode 2 - analysis of National Annexes Structural Concrete 1/2015 3-16 Technical Papers

Kurzfassung

Eurocode 2 consists of four parts that have to be applied in conjunction with the respective National Annexes of the CEN member states. The National Annexes were introduced, in particular, to maintain national safety levels and to account for regional aspects in the different states.
The CEN (European Committee for Standardization) will revise and extend all structural Eurocodes by 2018. As part of that process, two main objectives for revising Eurocodes have been formulated: a reduction in the number of Nationally Determined Parameters (NDP) and improving the “ease of use”.
In order to reduce the number of NDP, improve the ease of use and allow for further harmonization without changing the main structure and the design models of Eurocode 2, the National Annexes of EN 1992-1-1 for the different CEN member states have been compared and analysed. Furthermore, the analysis of the National Annexes may help to identify some main aspects for the revision of Eurocode 2.
This paper summarizes the analysis of the National annexes of EN 1992-1-1 and makes first proposals for further harmonization.

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Wang, Lijie; Caspeele, Robby; Van Coile, Ruben; Taerwe, Luc Extension of tabulated design parameters for rectangular columns exposed to fire taking into account second-order effects and various fire models Structural Concrete 1/2015 17-35 Technical Papers

Kurzfassung

Fire, as one of the most severe load conditions, has an important impact on concrete structures. Not only does a fire affect the material strength, it affects structural stiffness and stability as well. A concrete column, compared with other structural members, in most cases has to cope with both vertical forces and bending moments transferred by slabs and beams. Consequently, it is essential to find a reliable and practical way of establishing interaction curves for the overall structural behaviour of concrete columns subjected to fire. In this paper, a cross-sectional calculation method based on the material models of Eurocode 2 is explained and adopted in order to calculate interaction curves for a typical rectangular column exposed to the ISO 834 standard fire. Subsequently, an iterative approach is introduced to develop interaction curves taking into account second-order effects in the case of all the four faces of a column exposed to fire. The maximum permissible slenderness ratios for columns in different fire durations are obtained and compared with Eurocode 2 provisions. Finally, this method is used to calculate the maximum permissible slenderness ratios for columns exposed to hydrocarbon and natural fires.

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Duplan, François; Abou-Chakra, Ariane; Turatsinze, Anaclet; Escadeillas, Gilles; Brûlé, Stéphane; Javelaud, Emmanuel; Massé, Frédéric On the use of European and American building codes with low-strength mortars Structural Concrete 1/2015 36-44 Technical Papers

Kurzfassung

The standard European building specifications, grouped in a nine-volume Eurocode, describe different approaches for determining the properties of commonly used building materials such as steel, aluminium, concrete, etc.
The American Concrete Institute (ACI) also offers different reports concerning concrete structures (ACI 318R), lightweight concrete (ACI 213R) and the long-term mechanical behaviour (ACI 209R) of concrete. Those reports, used as building codes, are applicable when the properties and composition of the material respect various criteria.
All those materials that do not meet the scope criteria of Eurocode 2 or ACI reports because of their composition, property values or application cannot be used in the design of structures with those building codes. Regarding cement-based materials, concretes and mortars whose compressive strength is lower than the minima might not be useful for structures; however, they present an interesting potential for applications such as infrastructure materials, slabs-on-ground, etc. When designing structures and infrastructures in those materials, the accuracy of any formula offered by those building codes should be checked before being used.
This article compares experimental measurements and predictive formulas for the engineering properties (compressive and tensile strengths, modulus of elasticity). The results show that the addition of specific aggregates with low stiffness and strength modifies the relation between those engineering properties, thus reducing the accuracy of some of the predictive formulas suggested in ACI reports or Eurocodes.

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