Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Termine: Stahlbau 3/2017 | Stahlbau | 3/2017 | 299-300 | Termine | |
KurzfassungDresdner Stahlbaufachtagung 2017 Stahl- und Verbundbaukonstruktionen für den Neubau und das Bauen im Bestand x | |||||
Content: Steel Construction 3/2017 | Steel Construction | 3/2017 | Contents | ||
Jönsson, Jeppe | Eurosteel 2017 Copenhagen - The 8th European Conference on Steel and Composite Structures 13-15 September 2017 | Steel Construction | 3/2017 | 199 | Editorials |
Jensen, Jakob Laigaard; Lambertsen, Jens; Zinck, Morten; Stefansson, Einar | Challenges of water ingress into bridge cable systems | Steel Construction | 3/2017 | 200-206 | Articles |
KurzfassungExperience with the operation and maintenance of cable-borne bridges of various ages over the last 20 years shows that water ingress into steel cable systems often occurs and causes a high risk of serious corrosion that may lead to traffic restrictions, extraordinary inspection and maintenance costs and, in the worst case, bridge closures. Examples of such experience cover suspension bridges as well as cable-stayed bridges in the USA, UK, Germany, France, Argentina, Sweden, Norway, Denmark and many other countries. The problem of water ingress is particularly critical as inspections for corrosion in cable systems are difficult to carry out and early warnings difficult to obtain. x | |||||
Ichinose, Luiza Hiroko; Koyama, Masahiro; Sakano, Masahiro | Effectiveness of fatigue retrofits to transverse beam and sway bracing connections in steel bridges | Steel Construction | 3/2017 | 207-215 | Articles |
KurzfassungA great number of fatigue cracks have been found in the welded joints at the top end of web gap plates in the transverse beam connection, at the top end of vertical stiffeners in the sway bracing connection, and at the web penetrations with the transverse beam bottom flange. x | |||||
Fajuyitan, O. Kunle; Sadowski, Adam J.; Wadee, M. Ahmer | Buckling of very short elastic cylinders with weld imperfections under uniform bending | Steel Construction | 3/2017 | 216-221 | Articles |
KurzfassungThe length-dependent behaviour domains of thin elastic cylindrical shells under uniform bending have recently received significant research attention. Ovalization is known to affect very long cylinders that undergo significant cross-sectional flattening before failing by local buckling. This effect is restrained by the end boundary conditions in shorter cylinders, which instead fail by local buckling at moments close to the classical analytical prediction. In very short cylinders, however, even this local buckling is restrained by the end boundary, and failure occurs instead through the development of a destabilizing meridional fold on the compressed side. Although this is a limit point instability under bending, ovalization does not play any role at all. This 'very short' length domain has only recently been explored for the first time with the aid of finite element modelling. x | |||||
Bräutigam, Katharina; Knoedel, Peter; Ummenhofer, Thomas | Plastic behaviour of polygonal hollow sections in bending | Steel Construction | 3/2017 | 222-226 | Articles |
KurzfassungSteel poles made from polygonal sections are an economic alternative to circular hollow sections for use as lighting towers or transmission line pylons. For transmission lines especially, the intention behind the design of the poles is to make them more compact in order to avoid land usage and achieve an inconspicuous appearance. If the pole diameter is reduced, the slenderness of the sections needs to be reduced as well in order to achieve the desired resistance, but increasing the wall thickness disproportionately reduces the cost-effectiveness of the structure. The European design rules for overhead electrical lines [1] do not allow plastic behaviour of stocky sections to be used, which reduces the advantages of compact sections. x | |||||
Announcements: Steel Construction 3/2017 | Steel Construction | 3/2017 | 226 | Announcements | |
Nguyen, Van Vinh; Hancock, Gregory J.; Pham, Cao Hung | New developments in the direct strength method (DSM) for the design of cold-formed steel sections under localised loading | Steel Construction | 3/2017 | 227-233 | Articles |
KurzfassungA consistent and simplified direct strength method (DSM) is proposed for the design of cold-formed (or thin-walled) sections under localized loading, which is called web crippling. The development of this method proposes generalized equations for the design of thin-walled sections under the four different localized load cases: interior one-flange (IOF), end one-flange (EOF), interior two-flange (ITF) and end two-flange (ETF). The same parameters are used in the DSM equations for both the IOF and the EOF load cases. However, the ITF and ETF load cases require different parameters in the DSM equations to predict the capacities of structural members. The equations contain both an inelastic reserve component and a yield load component which are different from those proposed previously in this regard. x | |||||
Christensen, Rasmus Magdal; Nielsen, Mogens Gunhard; Støttrup-Andersen, Ulrik | Effective vibration dampers for masts, towers and chimneys | Steel Construction | 3/2017 | 234-240 | Articles |
KurzfassungSlender steel structures such as masts and towers consisting of or supporting cylindrical elements or chimneys can be susceptible to vortex shedding. Vortex-induced vibrations (VIV) can occur in slender structures because a fluctuating cross-wind force is generated from vortices shed alternately from opposite sides of the structure. Significant VIV occur when the frequency of the vortex shedding is the same as the natural frequency of the structure. If the critical wind speed for VIV often occurs for a structure and the vibration amplitudes caused by the VIV are critical with respect to fatigue, the result can be failure of the structure. An effective method of damping the vibrations can be to install a tuned liquid sloshing damper (TLSD). This paper focuses on the design of a TLSD and compares this with the tuned mass damper (TMD) solution. x | |||||
Grimsmo, Erik L.; Aalberg, Arne; Langseth, Magnus; Clausen, Arild H. | How placement of nut determines failure mode of bolt-and-nut assemblies | Steel Construction | 3/2017 | 241-247 | Articles |
KurzfassungBolt-and-nut assemblies under tension loading can either fail by bolt fracture or thread failure. The latter failure mode is arguably undesirable because it leads to failure at a comparatively low deformation level. Moreover, incipient thread failure is challenging to detect in the case of over-tightening since the bolt remains in the bolt hole after this type of failure occurs. The failure mode of bolt-and-nut assemblies is determined by several well-known factors such as the thread engagement length and the relative strength of bolt and nut. However, one factor that has received limited attention in the literature is the placement of the nut along the threaded portion of the bolt. We have performed a series of direct tension tests on various single M16 bolt-and-nut assemblies where the placement of the nut was varied. Some of the assemblies experienced that placing the nut close to the thread run-out, i.e. near the unthreaded portion of the bolt (the shank), led to thread failure, whereas placing the nut sufficiently far from the thread run-out led to bolt fracture. We carried out finite element simulations of the tests in order to investigate further the mechanisms occurring during failure. In the case where the nut was located close to the thread run-out, the simulations revealed that necking of the bolt affected the effective overlap of the internal and external threads. This effect seemed to contribute to thread failure in both tests and simulations. x | |||||
Odenbreit, Christoph; Nellinger, Sebastian | Mechanical model to predict the resistance of the shear connection in composite beams with deep steel decking | Steel Construction | 3/2017 | 248-253 | Articles |
KurzfassungThe resistance of a typical shear connection with headed shear studs in a composite beam is analysed for the normal case in accordance with EN 1994-1-1. The reducing effect of a trapezoidal metal decking to the ultimate loadbearing capacity is considered with empirically derived reduction factors and equations that were developed between the late 1970s and early 1980s. The RFCS research project “DISCCO” [1] investigated the shear stud resistance with novel types of steel decking. In many cases, the shear resistance predicted by EN 1994-1-1 [2] was not reached in tests. x | |||||
The open-air theatre in Tecklenburg has been refurbished | Steel Construction | 3/2017 | 253 | News | |
Dehan, Véronique; Bourgeat-Lami, Elodie; D'Agosto, Franck; Duffy, Brendan; Fortini, Andrea; Hilton, Sharon; Krassa, Kalliopi; Keddie, Joseph L.; Koh, Ming L.; Lansalot, Muriel; Lee, Michelle; Lesage de la Haye, Jennifer; Martin-Fabiani, Ignacio; Mantzaridis, Christos; Mazeffa, Douglas P.; Sear, Richard P.; Schulz, Malin; Sibbald, Morgan; Skerry, Brian; Thomas, Brett | High-performance water-based barrier coatings for the corrosion protection of structural steel | Steel Construction | 3/2017 | 254-259 | Articles |
KurzfassungThis article provides an overview of the outcomes of a European-funded project called BarrierPlus. A new type of water-based barrier coating was developed for structural steel applications. The advantages of this coating include enhanced moisture resistance, low volatile organic compounds (VOCs) and one-component self-crosslinking free of isocyanates. To enable this performance, a latex polymer binder was uniquely designed without using soap-like molecules, known as surfactants, to form the dispersion. By minimizing surfactants in the coating, the barrier properties were significantly enhanced. The latex was successfully scaled up to 15 kg quantities by an SME, coating formulations were scaled to pilot quantities and a variety of characterization and coating performance tests were completed. A life cycle assessment found that the BarrierPlus coating has a better environmental profile than an industry benchmark solvent-borne coating and showed promising results relative to commercial waterborne benchmarks. x | |||||
ECCS news: Steel Construction 3/2017 | Steel Construction | 3/2017 | 261-264 | ECCS news | |
Kurzfassung
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Inhalt: UnternehmerBrief Bauwirtschaft 3/2017 | UnternehmerBrief Bauwirtschaft | 3/2017 | Inhalt | ||
Schalk, Günther | Compliance - Notwendigkeit oder Modetrend? | UnternehmerBrief Bauwirtschaft | 3/2017 | 1 | Editorials |
Ernst & Sohn (Hrsg.) | Gesamtausgabe UBB 3/2017 | UnternehmerBrief Bauwirtschaft | 3/2017 | 1-24 | Gesamtausgabe |
Kurz informiert: UnternehmerBrief Bauwirtschaft 3/2017 | UnternehmerBrief Bauwirtschaft | 3/2017 | 2 | Kurz informiert | |
KurzfassungBVMB fordert mehr Ausschreibungen x | |||||
Luithlen, Christoph; Janssen, Raimond | Vertragspartner insolvent? Strategien zum Eigenschutz | UnternehmerBrief Bauwirtschaft | 3/2017 | 3-8 | Berichte |
KurzfassungDie Insolvenzanfechtung ist - mit ausdrücklichem gesetzgeberischen Willen - als äußerst scharfes Schwert gegen gläubigerseits ignorierte Kriseneintrittssignale von späteren Insolvenzschuldnern ausgestaltet. Die Anfechtungstatbestände der Insolvenzordnung (InsO) sind deshalb so gefährlich, weil sie nicht darauf Rücksicht nehmen, welchen Ertrag der Auftraggeber im konkreten Auftrag erwirtschaftet hat. Gegenstand von anfechtungsbedingten Rückzahlungsansprüchen des späteren Insolvenzverwalters des Schuldnerunternehmens sind nicht etwa die in jenem Auftrag erwirtschafteten Erträge, sondern - ohne Rücksicht auf die bereits investierten Eingangsleistungen - die erhaltenen Zahlungen. Der UBB gibt einen Überblick über die Systematik. x | |||||
Schalk, Günther | Klare Ansagen beim Familientreffen der Mittelständler | UnternehmerBrief Bauwirtschaft | 3/2017 | 9-11 | Berichte |
KurzfassungEs ist jedes Jahr das große Familientreffen der mittelständischen Baufirmen aus ganz Deutschland: Knapp 600 Teilnehmer folgten der Einladung der Bundesvereinigung Mittelständischer Bauunternehmen (BVMB) zum traditionellen Neujahrsempfang nach Bonn. Neben einem Unterhaltungsprogramm, einer Fachausstellung und viel Gelegenheit zum persönlichen Austausch standen politische Botschaften im Vordergrund. BVMB-Präsident Thorsten Bode sprach die Themen erfrischend klar an, die den Mittelständlern auf den Nägeln brennen. Kein leichtes Unterfangen für den parlamentarischen Staatssekretär Norbert Barthle, der das Bundesverkehrsministerium vertrat und unmittelbar auf Bodes Rede antwortete. x | |||||
Höhere Werbungskosten für Bauleiter möglich | UnternehmerBrief Bauwirtschaft | 3/2017 | 12 | Berichte | |
KurzfassungWaren Sie 2016 als Bauleiter an verschiedenen Baustellen und nur einen Tag in der Woche in der Einrichtung Ihres Arbeitgebers tätig, können Sie in der Steuererklärung 2016 deutlich höhere Werbungskosten geltend machen. Es gelten für Sie in diesem Fall nach einem Urteil des Finanzgerichts Nürnberg nämlich die steuerlich günstigen Reisekostengrundsätze. x | |||||
Anliegerbeiträge: Muss Baufirma Kostenstruktur offenlegen? | UnternehmerBrief Bauwirtschaft | 3/2017 | 12-13 | Berichte | |
KurzfassungErledigen Sie Bauarbeiten für eine Stadt oder Gemeinde, die dafür die umliegenden Anlieger zur Kasse bittet, kann es passieren, dass Sie offenlegen müssen, wie hoch der Anteil der Arbeitsleistung und des Materialeinsatzes ist. Hintergrund ist ein Musterprozess zur Steueranrechnung für solche Anliegerbeiträge. x | |||||
Lebensversicherung 2017: Steuererklärung einreichen! | UnternehmerBrief Bauwirtschaft | 3/2017 | 13 | Berichte | |
KurzfassungIm Jahr 2017 können Lebensversicherungen, die ab dem 1.1.2005 abgeschlossen wurden, steuerbegünstigt verkauft werden. Behält die Versicherung Steuern ein, sind diese in aller Regel überhöht. Doch Sie können sich die zu hohen Steuerzahlungen wieder zurückholen. x | |||||
Schalk, Günther | Aktuelles aus der Rechtsprechung | UnternehmerBrief Bauwirtschaft | 3/2017 | 14-15 | Berichte |
KurzfassungWer schafft an, wie gebaut wird? x |