Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Bender, Burkhard | Complianceregeln verletzt? Geschäftsführer haftet! | UnternehmerBrief Bauwirtschaft | 9/2014 | 19 | Berichte |
KurzfassungDas Thema Compliance ist auch in Folge der juristischen Aufarbeitung von Fehlentwicklungen, die zu der Wirtschaftskrise der Jahre 2008 und 2009 geführt haben, derzeit nicht nur in Großkonzernen beherrschendes Thema. Die Einhaltung von Gesetzen und Richtlinien im Unternehmen (genau dies ist Compliance) wird auch für den Mittelstand ein Thema. Denn mittlerweile nehmen Gerichte die Unternehmensleitung persönlich in die Haftung, wenn Mitarbeiter gegen Recht und Gesetz verstoßen. x | |||||
Schäfer, Matthias | Compliance versagt ohne werteorientierte Führungskultur | UnternehmerBrief Bauwirtschaft | 11/2017 | 3-8 | Berichte |
KurzfassungIn einer europaweiten Unternehmensbefragung zur Wirtschaftskriminalität sorgt Deutschland für bedenkliche Ergebnisse. Wie halten es die Manager mit der Ethik und stimmt das Bild des ehrbaren Kaufmanns, das gerade in Deutschland so gerne gezeichnet wird? Diesen Fragen geht die Prüfungs- und Beratungsgesellschaft Ernst & Young in einer Studie nach, für die rund 4.100 Entscheidungsträger aus Unternehmen in 41 Ländern befragt wurden, davon 100 Manager aus Deutschland. So ist in dieser Studie, die Anfang April dieses Jahres vorgestellt worden ist, zu lesen, dass 43 % der Manager hierzulande Korruption in der Republik mittlerweile für weit verbreitet halten. Besorgniserregend stimmen die Antworten auf die Frage, wie man es selbst mit der Moral halte. 23 % der befragten deutschen Manager erklärten freimütig, dass sie für das eigene berufliche Fortkommen und eine höhere Bezahlung unethisch handeln würden. Um ihrem Unternehmen in wirtschaftlich schwierigen Zeiten zu helfen und Aufträge zu erhalten, würden sich laut dieser Erhebung 11 % der deutschen Manager zu Schmiergeldzahlungen hinreißen lassen. Selbst wenn diese Umfrage nach wissenschaftlichen Maßstäben nicht repräsentativ sein sollte, ist trotzdem erschreckend, mit welchem Verständnis in manchen deutschen Unternehmen in Leitungspositionen agiert wird. x | |||||
Schalk, Günther | Compliance - Notwendigkeit oder Modetrend? | UnternehmerBrief Bauwirtschaft | 3/2017 | 1 | Editorials |
Breit, K. | Complex grouting tasks at home and abroad as seen by the contractor / Komplexe Injektionsaufgaben im In- und Ausland aus der Sicht des Ausführenden | Geomechanics and Tunnelling | 5/2009 | 460-468 | Topics |
Kurzfassung“The devil is in the detail” - this is particularly true for the implementation of complex grouting work. The term grouting includes a number of sophisticated processes including waterproofing, stabilisation, pressure tunnel, compensation, inclined shaft, vacuum, consolidation, sealing curtain, alluvial and rock grouting. The formulation of injection criteria, as part of the design as well as for construction, varies as much as the descriptions of these techniques. Some criteria are explained through examples from the point of view of the contractor. x | |||||
Söhnchen, Andreas; Schoch, Torsten | Complex building element monitoring - interior insulation in practical test / Komplexes Bauteilmonitoring - Innendämmung im Praxistest | Mauerwerk | 6/2017 | 357-368 | Fachthemen |
KurzfassungGermany has set ambitious targets at a national level for the reduction of emissions with the Energiekonzept 2010: by 2020, emissions should be reduced by at least 40 % compared to 1990. By 2050, a reduction of emissions by 80 to 95 % (compared to 1990) is intended [1]. In order to even come near to these targets, the energy-related refurbishment of existing buildings has been gaining significance for some years. Facades that are worth preserving or under listed building protection limit the upgrading options on the outside, but interior insulation solutions are as ever regarded with suspicion by some protagonists. The following article reports on the building physics support for a particularly challenging refurbishment project. x | |||||
Complete lectures about construction using steel structural hollow sections | Steel Construction | 3/2009 | 166 | News | |
Schleiss, Anton | Competitive pumped-storage projects with vertical pressure shafts without steel linings / Konkurrenzfähige Pumpspeicherwerkprojekte dank ungepanzerter, vertikaler Druckschächte | Geomechanics and Tunnelling | 5/2013 | 456-463 | Topics |
KurzfassungFor the highly loaded pressure tunnels and shafts that are used for the extension of storage power plants with pumped storage and to increase installed capacity, alignments of the waterway system with high overburden are of great importance from the economical and safety points of view. With the development of the raise-boring method, vertical pressure shafts can now be drilled up to 800 m in one step. x | |||||
Competitions - Wettbewerbe: Mauerwerk 2/2017 | Mauerwerk | 2/2017 | 129-135 | Wettbewerbe | |
KurzfassungGermany's best brick buildings honoured / Deutschlands beste Ziegelbauten prämiert x | |||||
Stärk, Alfred; Pujol, Roser Soler; Hill, Nigel; Kettle, Clif T. | Compensation grouting - Balance between asset protection and collateral damage through the example of Crossrail C510 / Hebungsinjektionen - Balance zwischen Gebäudeschutz und Kollateralschäden am Beispiel von Crossrail C510 | Geomechanics and Tunnelling | 5/2017 | 489-496 | Topics |
KurzfassungCrossrail, a new 120 km long railway line, is currently the largest infrastructure project in Europe with a volume of about GBP 15 billion. Contract C510 includes the new Liverpool Street station in the City of London using the sprayed concrete lining method. The station tunnels were excavated in close proximity to a dense network of existing tunnels. The multi-storey office buildings on the densely built up surface include some listed buildings. The aim of compensation grouting in the first place was to avoid settlement due to tunnel construction altogether, or at least minimise the impact within defined limits. Remediation of settlement which occurred regardless was only anticipated in extraordinary circumstances. This paper highlights the difficulties of balancing the desired control of settlement by means of compensation grouting against adverse effects on adjacent structures. The paper closes with a description of how the seemingly impossible lifting of one column eventually worked by localised grouting. x | |||||
Chen, Li; Casas, Gonzalo; Kasirer, Chen; Van Mele, Tom | COMPAS: Softwarelösung für komplexe Bauprojekte | Bautechnik | 8/2023 | 476-482 | Berichte |
KurzfassungIn einem Bauprojekt arbeiten verschiedene Disziplinen wie Architektur, Ingenieurwesen, Fachplanung und ausführende Bauunternehmen zusammen. Für den Entwurf, die statische Berechnung und die Ausführungsplanung werden unterschiedliche Softwarelösungen eingesetzt. Anpassungen im Entwurf und der Planung müssen zeitaufwendig in jeder einzelnen Softwarelösung manuell eingearbeitet werden. Bei komplexen Geometrien und innovativen Bauweisen sind zusätzliche Analysen und Anpassungen erforderlich, was mit heutigen Softwarelösungen kaum realisierbar ist. Für einen effizienten Datentransfer zwischen verschiedenen Softwareumgebungen wurde COMPAS entwickelt, sodass Innovationen im Bauwesen gefördert werden. COMPAS ist eine Open-Source-Umgebung, welche unabhängig von kommerziellen Softwarelösungen verwendet werden kann. Es verfügt über eine Geometriedatenbank, flexible Datenstrukturen für unterschiedliche Disziplinen und Algorithmen für Berechnungen wie z. B. Tragwerksanalysen. Es gibt zahlreiche COMPAS-Erweiterungen für spezifische Anwendungen wie Montageplanung, Holzbau, Roboterfertigung und additive Fertigung. Anfang 2023 wurde der Verein COMPAS gegründet, um die Weiterentwicklung und Ausbildung voranzutreiben. x | |||||
Sellmeier, Bettina; Thuro, Kurosch | Comparison of two 3D rockfall codes on behalf of a case study in the Bavarian Alps | Geomechanics and Tunnelling | 1/2017 | 15-23 | Topics |
KurzfassungRockfall events along main traffic routes in alpine regions emphasize the necessity of enhancing hazard assessment, especially in terms of rockfalls. In the field of regional rockfall modelling it becomes more and more important to work with 3D rockfall codes to account for morphological structures. Due to the general scale of regional rockfall modelling it is in most cases not possible to collect quantitative field data. Thus the input parameters are determined according to disposition models like in the Bavarian hazard map. The current paper deals with a detailed rockfall study which was accomplished during rockslope scaling works in the Bavarian Alps. The rock slope consisting of the Hauptdolomite-Formation extends along the federal road B 305 north of the village of Schneitzlreuth in Bavaria. Due to attending rockslope scaling works in cooperation with the State Agency for Construction in Traunstein, a quantification of block dimensions according to real rockfall field tests was possible. After having determined the three main block axes for over 300 rocks, rockfall modelling were accomplished applying the 3D rockfall codes Rockyfor3D and RAMMS::Rockfall. One part of the parameter studies covers the main proportion of the detected block sizes using Rockyfor3D. The second part of the study presents a comparison of the Rockyfor3D and RAMMS::Rockfall outcomes, taking the same block class for both codes into account. This paper demonstrates the limits and possibilities of using different 3D rockfall codes taking detailed field data into account. x | |||||
Uhlemann, Jörg; Stranghöner, Natalie; Saxe, Klaus | Comparison of stiffness properties of common coated fabrics | Steel Construction | 4/2015 | 222-229 | Articles |
KurzfassungWoven coated fabrics commonly used for tensile membrane structures are PVC-coated polyester fabrics and PTFE-coated glass-fibre fabrics. Regarding the stiffness of these materials, membrane structure experts frequently point out that glass/PTFE fabrics are “stiffer” than PES/PVC fabrics. However, this statement cannot be verified by existing literature, although numerous publications deal with the stress-strain behaviour of coated woven fabrics. Available stress-strain test data are almost impossible to compare, mainly because published stress-strain data for glass/PTFE refer to materials with higher strengths than the published test data for PES/PVC materials. The aim of the present paper is to compare the stiffness properties of PES/PVC and glass/PTFE fabrics with identical tensile strength properties by means of theoretical investigations and uniaxial tensile tests. The results demonstrate that glass-fibre fabric indeed exhibits a higher tensile stiffness than comparable polyester fabric for typical working stress ranges between the prestress level and the maximum design strength. However, for lower stress ranges up to approximately three-quarters of the design strength, the tensile stiffness of glass-fibre fabrics is identical with or even lower than that of comparable polyester fabric. The transverse strain is considerably higher for the glass-fibre fabric throughout. x | |||||
Tveit, P. | Comparison of Steel Weights in Narrow Arch Bridges with Medium Spans (Vergleich der Stahlgewichte von schmalen Bogenbrücken mit mittleren Spannweiten) | Stahlbau | 9/1999 | 753-757 | Fachthemen |
KurzfassungDer Verfasser ist überzeugt, daß er nach 44 Jahren Arbeit mit Netzwerkhängern seine konkurrenzfähigste Brücke entworfen hat. Die Brücke benötigt sehr wenig Stahl, da sie eine sehr geringe Biegung und Knickung vorweist und somit hochfesten Stahl gut ausnutzen kann. Die Details sind einfach und werden mehrfach wiederholt. Zudem sind die Schweißnähte kurz. Aus diesen Gründen ist der Preis pro Tonne Stahl niedrig. Die Montage ist preiswert. Der vorgestellte Netzwerkhänger besitzt viele Hängerstäbe. Die Unterhaltungskosten sind gering, da die Stahloberflächen klein gehalten wurden und sich über der Fahrbahn befinden. Die teilweise Vorspannung in Längsrichtung wirkt sich günstig auf die Unterhaltungskosten aus. x | |||||
Glahn, Oliver; Voß, Tjado; Voss, Karsten; Schwickert, Susanne | Comparison of stationary and transient RANS modelling - Spatial velocity field of a ceiling integrated fan | Bauphysik | 6/2020 | 326-334 | Aufsätze |
KurzfassungCeiling fans allow an increase of the local air velocity on the human body. The associated heat transfer increases user's temperature tolerance in warm environments. x | |||||
Rudin, Christoph; Eckmann, Bruno | Comparison of safety and ventilation aspects of emergency stations in very long railway tunnels / Sicherheits- und lüftungstechnische Gegenüberstellung von Nothaltestellen sehr langer Eisenbahntunnel | Geomechanics and Tunnelling | 6/2013 | 732-742 | Topics |
KurzfassungIn very long rail tunnels (> 20 km), emergency stations (NHS) are provided for trains to stop in case of an incident. Emergency stations are constructionally detailed and equipped so that the passengers can be evacuated quickly and safely in case of an incident such as a fire in a train. Such emergency stations are provided in the existing Lötschberg Base Tunnel (CH, opened 2007) and similar tunnels that are currently under construction, the Gotthard Base Tunnel (CH), Brenner Base Tunnel (A), new Semmering Base Tunnel (A) and Koralm Tunnel (A). The present article compares and explains in detail the ventilation and safety aspects of emergency stations and the construction detailing, ventilation and safety equipment, which have to be considered in the design of an emergency station. x | |||||
Yu, Qiang; Le, Jia-Liang; Hubler, Mija H.; Wendner, Roman; Cusatis, Gianluca; Ba ant, Zden k P. | Comparison of main models for size effect on shear strength of reinforced and prestressed concrete beams | Structural Concrete | 5/2016 | 778-789 | Technical Papers |
KurzfassungThis paper presents a critical comparison of the existing code provisions for the shear strength of concrete beams. The comparison is based on the computerized filtering-out of the inevitable statistical bias from the available multivariate database on shear strength, on an examination of the predicted size effects on shear strength and their underlying hypotheses and on the results of recent high-fidelity numerical simulations of shear failure. In addition to examining the existing models, the present comparison also provides several key considerations for testing the scientific soundness of any model of shear failure in concrete beams, which is necessary for future revisions to the design code provisions. x | |||||
Latz, Sebastian; Scholzen, Frank; Thewes, Andreas; Maas, Stefan | Comparison of high-performance and conventional internal insulation materials based on hygrothermal analysis using in situ measurements and simulation | Bauphysik | 1/2022 | 9-20 | Aufsätze |
KurzfassungFollowing the European directive to reduce CO2 emissions of existing buildings by improving energy efficiency, internal insulation systems play a central role in the renovation of historically valuable buildings which cannot be insulated from the outside for reasons of monumental protection, or in cases where no additional exterior space is available. However, besides the thermal property of insulation systems, there are other relevant properties to be considered before choosing an internal insulation system, such as the hygrothermal behavior which plays a particularly important role in diffusion-open interior insulation systems. As the internal insulation layer reduces the temperature of the existing wall during the heating season, its drying potential after rain events is considerably reduced. In addition to the effects of moisture from the outside (mainly wind driven rain), the entry of humidity from the inside through diffusion plays an important role. In the presented study, high performance insulation materials with nanostructure based on silicon dioxide and polyurethane are compared to conventional material based on wood fiber from a hygrothermal point of view by analyzing in situ measurements and simulations. x | |||||
Svoboda, Thomas; Masin, David | Comparison of displacement field predicted by 2D and 3D finite element modelling of shallow NATM tunnels in clays | geotechnik | 2/2011 | 115-126 | Fachthemen |
KurzfassungThe 2D load-reduction method for simulating NATM tunnels using plane strain finite elements is evaluated in the paper by comparison with fully 3D simulations. Three real shallow tunnels in urban environment in different stiff clays were simulated. The soil behaviour was described by an advanced non-linear soil constitutive model based on the hypoplasticity theory. Time-dependent behaviour of shotcrete lining was considered in 3D simulations, whereas constant final stiffness was used in the plane strain analyses. The 2D analyses were thus controlled by a single parameter that accounts for 3D effects. It is shown that for an optimum value of this parameter, the displacement field predicted by the 2D method agrees well with the 3D simulations. In some cases only, a discrepancy was observed in the close vicinity of the tunnel. The controlling parameter was, however, found to be dependent on the problem simulated (for the same material) and also on the material properties (for the same tunnelling problem). Considering the material properties, the shear modulus at very small strain was found to be more influential than the shear modulus at large strain. The initial K0 stress state did not influence the controlling parameter substantially. x | |||||
Vering, Christian; Maier, Laura; Breuer, Katharina; Mehrfeld, Philipp; Müller, Dirk | Comparison of annual performance factors of normatively designed heat pump systems | Bauphysik | 2/2021 | 125-132 | Aufsätze |
KurzfassungHeat pumps play a key role in decarbonizing the heat supply for buildings. To exploit heat pump's potential in a resource-efficient way, high coefficients of performance (COP) are required. For air-source heat pumps, the COP is subject to outside temperature, building dynamics, and user demands. To achieve high COPs, it is necessary to design heat pumps to meet the demands and to optimize operation in terms of COP. x | |||||
Petrescu, I.; Popa, N. | Comparative study of a bowstring arch bridge stability with various types of wind bracings (Vergleichende Studien zur Stabilität einer Bogenbrücke (Nielsen-System) mit verschiedenen Windverbänden) | Stahlbau | 2/1999 | 145-148 | Fachthemen |
KurzfassungDie Arbeit erörtert einige Ergebnisse der Stabilitätsberechnung mit der Methode der Finiten Elemente für eine Straßenbogenbrücke im Nielsen-System mit einer Spannweite von 171 m; als Parameter wurde der Typ des Windverbandes zwischen den beiden Bögen gewählt. Die analysierte Tragstuktur ist die Strombrücke über den Donau-Schwarzmeer-Kanal bei Cernavoda, die eine Gesamtlänge von L = 526,83 m hat. Die orthotrope Fahrbahntafel ist mit Hilfe von geneigten sich kreuzenden Hängern an die beiden Bögen aufgehängt. Die Arbeit beschreibt sowohl den Einfluß der Geometrie, Steifigkeit und der Art der Querverbände zwischen den beiden Bögen als auch den der geometrischen Imperfektionen auf die Gesamtstabilität der Tragstruktur. x | |||||
Macek, Matej; Logar, Janko; Pulko, Bo tjan | Comparative evaluation of soil properties using CPT and DMT in-situ tests / Vergleichende Bewertung der Bodeneigenschaften durch CPT und DMT | Geomechanics and Tunnelling | 4/2019 | 318-327 | Topics |
KurzfassungThe piezocone penetration test (CPT) and flat dilatometer test (DMT) are routinely used in geotechnical practice and are often considered adequate for detailing of soil profile and determination of soil properties. This paper presents comparison of results of ground characterization and evaluation of soil properties based on the combined use of CPT and DMT at four different locations, each with different ground composition. Evaluation of both tests in terms of soil type, undrained shear strength, constrained modulus and friction angle is presented and results are compared. In some cases the results are also compared with laboratory data. The main objective is to show that companion sets of CPT and DMT at a given site could be used to better define the geotechnical ground model and to increase confidence in the evaluation of soil properties. x | |||||
Manco, Tiago; Rigueiro, Maria Constança; Martins, João Pedro; da Silva, LuÃs Simões | Comparative assessment of the design of tubular elements according to offshore design standards and Eurocode 3 | Steel Construction | 4/2016 | 266-278 | Articles |
KurzfassungSteel circular tubular elements are among the most commonly used types of structural element in offshore structures. The objective of this paper is to perform a comparative analysis of design standards for offshore structures with a focus on the structural design of these elements. The intention is to reach a conclusion about the level of safety that offshore and construction standards provide regarding the design of tubular circular elements. To this end, the bearing capacity obtained with ISO 19902 and Eurocode 3 (which does not contain specific provisions for offshore structures) parts 1-1 and 1-6 will be compared in a broad parametric study. Subsequently, the accuracy and level of safety that ISO and EC3 assume are assessed through numerical analysis using the ABAQUS software. The performance of a set of steel circular tubular elements is evaluated under axial compression and hydrostatic pressure. Finally, the interaction between axial compression and hydrostatic pressure is also analysed. x | |||||
Company founder Dr. Leonhard Obermeyer has passed away / Firmengründer Dr. Leonhard Obermeyer verstorben | Geomechanics and Tunnelling | 1/2012 | 15-16 | People | |
Compaction of Soils, Granulates and Powders | Bautechnik | 9/1999 | 839 | Termine | |
Huber, Stefan; Henzinger, Christoph; Heyer, Dirk | Compaction control of secondary materials used in earthworks | geotechnik | 4/2019 | 199-211 | Fachthemen |
KurzfassungCompaction control is a fundamental part of quality assurance for earthworks and essential to ensuring the long-term stability and serviceability of earth structures. As the testing of relative compaction for coarse-grained materials is time-consuming, plate load tests are typically used for this purpose. Practical experience shows that the compaction control of secondary materials using plate load tests is not as straightforward as suggested in earthwork specifications. Unfortunately, these subtleties are not widely known and typically lead to rejection of the compacted layers, despite the material having been compacted thoroughly. This paper summarizes the findings of compaction field tests on several secondary materials that were field-compacted to varying dry densities. Field testing of the compacted layers included the determination of dry density and plate load tests (static and dynamic). The results of these field tests are presented and discussed here and show that the parameters provided by plate load tests do not relate to the dry densities of the materials tested in the same way as they do for natural materials. Suggestions are provided concerning the most viable way of conducting compaction control of secondary materials within the earthwork specifications of Germany and Austria. x |