Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Haselsteiner, Ronald; Ersoy, Burcu; Pamuk, Resul | Aspects concerning the shear strength of rockfill material in rockfill dam engineering | geotechnik | 3/2017 | 193-203 | Fachthemen |
KurzfassungThe stress-dependent shear strength behaviour of rockfill is frequently estimated by simple shear strength parameter. A linear shear relation between vertical and shear stresses is almost always applied. However, the actual shear strength behaviour of rockfill differs from this theoretical line. A curve is formed which indicates that strong shear strength at low stresses gradually decreases with increasing stress. x | |||||
Perzlmaier, Sebastian; Hofer, Bernhard; Holzmann, Michael | Aspects of engineering geology concerning the selection of a site for the upper stage reservoir for the Kaunertal power plant expansion project / Ingenieurgeologische Aspekte bei der Standortwahl für den Oberstufenspeicher des Projekts Ausbau Kraftwerk Kaunertal | Geomechanics and Tunnelling | 5/2012 | 473-484 | Topics |
KurzfassungAmong other major projects for the use of domestic hydropower, Tiwag (Tiroler Wasserkraft AG/Tyrol Water Power plc) is planning the expansion of the Kaunertal power station. Important components of the project are a new lower stage power station (Prutz 2), a new diversion tunnel to the Gepatsch reservoir with water catchments in the upper Ötztal valley and a new upper stage with a new reservoir at Platzertal. x | |||||
Reinhardt, Hans-Wolf | Aspects of imposed deformation in concrete structures - a condensed overview | Structural Concrete | 4/2014 | 454-460 | Technical Papers |
KurzfassungImposed deformation is a special case of loading that gets much less attention than mechanical loading due to external forces. However, imposed deformation can impair the serviceability of structures such as tightness and durability. Imposed deformations are due to shrinkage of concrete and temperature variations. The boundary conditions play an important role when analysing stresses due to imposed deformation. This paper provides an overview. x | |||||
Albrecht, G.; Klähne, Th.; Stucke, W. | Aspekte der bautechnischen Prüfung des Bauvorhabens Lehrter Bahnhof Berlin | Stahlbau | 12/2002 | 890-903 | Fachthemen |
KurzfassungBehandelt werden statisch-konstruktive Problemstellungen des Bauvorhabens Lehrter Bahnhof Berlin aus Sicht der Prüfingenieure. Einführend wird das Gesamtbauvorhaben mit seinen Einzelbauwerken und deren Zusammenspiel beschrieben. Die außerordentliche Komplexität spiegelt sich in der Beherrschung der Schnittstellen zwischen den Einzelbauwerken wider, was die Wichtigkeit der Koordination - auch bei der Prüfung - unterstreicht. Abschließend werden auf der Grundlage der gewonnenen Erfahrungen Schlußfolgerungen für die bautechnische Prüfung von Großprojekten gezogen. x | |||||
Sedlacek, G. | Aspekte der Gebrauchstüchtigkeit von Stahlbauten. | Stahlbau | 10/1984 | 305-310 | Fachthemen |
KurzfassungDas neue Bemessungsvorgehen mit getrennten Sicherheitsnachweisen für den Grenzzustand der Tragfähigkeit und den Grenzzustand der Gebrauchsfähigkeit, das das deezeitige Bemessungsverfahren mit zulässigen Spannungen ablösen wird, macht es erforderlich, Grenzbedingungen für die Gebrauchsfähigkeit zu definieren. Anhand von vier typischen Beispielen, einer Komfortbedingung für eine Deckenkonstruktion, der Dauerhaftigkeitsbedingung für ein Schornsteingerüst, der Bedingung für Rissefreiheit von Fahrbahnbelägen auf orthotropen Platten und die Begrenzung der Seitensteifigkeit von Hallenrahmen wird auf solche maßgebenden Grenzbedingungen eingegangen und das Bemessungsergebnis gezeigt. x | |||||
Wunsch, R. | Aspekte der Interaktion Baugrund - Bauwerk am Beispiel der Sparschleuse Rothensee | Bautechnik | 9/1998 | 710-716 | Fachthemen |
KurzfassungDie Sparschleuse Rothensee wird im Zuge der Ausbaumaßnahmen am Wasserstraßenkreuz Magdeburg errichtet. Das Bauwerk ist auf durch Fugen getrennten einzelnen Bodenplatten flach gegründet. Aufgrund des im wesentlichen bindigen Untergrundes kommt der im Rahmen des Gebrauchstauglichkeitsnachweises durchgeführten Setzungsberechnung besondere Bedeutung zu. Diese ermöglicht erst eine zuverlässige Dimensionierung der erforderlichen Bauwerksfugen. Neben der Setzungsberechnung wird das statische Berechnungskonzept vorgestellt. x | |||||
Gà sior, J.; Zóltowski, K. | Aspekte der Montage von Stahlkonstruktionen in der Gegend von Szczecin | Stahlbau | 8/2003 | 581-587 | Fachthemen |
KurzfassungSzczecin ist sowohl das historische als auch gegenwärtige Industrie- und Kulturzentrum von Westpommern. Die Stadt wurde direkt am Oderdelta erbaut, da der Fluß die Hauptschlagader des geschäftlichen Zentrums der Hansestadt war. Aus diesem Grund befinden sich der Hafen und die Werft unmittelbar im Zentrum der Stadt. Die Verkehrszunahme in und um Szczecin erforderte den Bau neuer Brücken. So wurden in den letzten 16 Jahren einige Großbrücke aus Stahl errichtet. Dieser Aufsatz befaßt sich mit der Technologie der Montage von Brückenfeldern. In allen beschriebenen Fällen wurde ein ähnliches Montageverfahren verwendet, das aus drei Grundschritten besteht: - Vorfertigung der Elemente in für den Transport geeigneten Abmessungen - Montage der Grundelemente zum Gesamtsegment an einem zentralen Ort - Transport des Gesamtsegments und Montage am Zielort. Besondere Aufmerksamkeit gilt den objektiven, bei den Montagen auftretenden Randbedingungen und den theoretisch-technischen Problemen. x | |||||
von Wölfel, W. | Asphaltanwendung in der Antike. | Bautechnik | 11/1997 | 790-793 | Berichte |
Eberth, Florian | Asphaltarmierungen im Straßenbau - Grundlagen und Funktionsweise einer spannungsaufbauenden Armierung im Asphalt | Bautechnik | 12/2015 | 876-878 | Berichte |
KurzfassungDie Bauweise der Asphaltarmierungen hat sich am Markt durchgesetzt, da sie durch ihre vorbeugende Wirkung als Rissprophylaxe sehr wirtschaftlich ist. Hohe Unterhaltungskosten z.B. für das Vergießen von Rissen bzw. der aus unbehandelten Rissen entstehenden Folgeschäden, können zukünftig eingespart werden. x | |||||
Schuhbauer, A. | Asphaltbeton als Basisabdichtung von Deponien. | Bautechnik | 9/1994 | 566-581 | Fachthemen |
KurzfassungBis vor einigen Jahren dachte niemand daran, Deponien mit Asphaltbeton oder anderen Asphalterzeugnissen abzudichten. Die Asphaltfachleute waren der Meinung, daß Asphalt schon wegen seiner geringen Beständigkeit gegenüber Lösungsmitteln dafür ungeeignet ist, da ja Asphalt durch aliphatische oder noch leichter durch zyklische Kohlenwasserstoffe und Chlorkohlenwasserstoffe in seine Bestandteile Bitumen und Mineralstoffe zerlegt werden kann. Befestigungen aus Asphalt an Großtankstellen, Flugzeugabstellflächen und Tankfeldern, wo starker Anfall von Benzin, Flugbenzin, Diesel, Heizöl oder anderen Lösungsmitteln auftritt, wurden im Laufe der Zeit zerstört. In neuerer Zeit wird die Verwendung von Asphaltbeton für Deponiebasisabdichtungen propagiert. Das Hauptargument der Befürworter des Asphaltbetons ist, daß sich Asphalt im Wasserbau bei der Herstellung von Kanälen, Talsperren und Speicherbecken bestens bewährt hat. Wenn nun auch eine ausreichende Lösungsmittelbeständigkeit und Chemikalienbeständigkeit nachgewiesen würde, dürfte der Anwendung von Asphaltbeton im Deponiebau nichts mehr im Wege stehen. In dem Forschungsvorhaben "Eignung von Asphalten als Baustoff für Basisabdichtung von Deponien" glauben die Verfasser einen derartigen Nachweis geführt zu haben. x | |||||
Muggler, M. | Asphaltdichtungsarbeiten beim Bau des Hornbergbeckens. | Bautechnik | 5/1976 | 156-159 | |
KurzfassungEs wird über Arbeiten zur Erstellung eines Pumpspeicherbeckens auf ca. 1000 m Höhe im südlichen Schwarzwald berichtet und insbesondere die Ausführung der Dammwände und ihrer Asphaltdichtung vorgestellt. x | |||||
Asphaltstraßentagung 2001 | Bautechnik | 2/2002 | 121 | Nachrichten | |
Asphaltstraßentagung 2003 | Bautechnik | 3/2003 | 205 | Termine | |
Matos, Ana Mafalda; Sousa-Coutinho, Joana | ASR and sulphate performance of mortar containing industrial waste | Structural Concrete | 1/2016 | 84-95 | Technical Papers |
Kurzfassung“Greener” concrete using adequate industrial waste is a preferred option for sustainable construction. Alkali-silica reaction (ASR) and sulphate attack (SA) on concrete can be minimized by the use of mineral additions, which are particularly interesting if derived from waste. Grits from the paper industry, waste glass and two types of biomass ash were used as 10 % cement replacement in mortar and tested for ASR and SA. Results and scanning electron microscopy observations were compared with plain mortar and mortar containing commercial silica fume. All waste materials mitigated ASR compared with the control mortar. Resistance to sulphates was increased for one of the biomass ashes used and especially for glass powder, which surpassed silica fume. Therefore, two of these waste materials seem to be promising as partial replacement materials for cement, leading to enhanced durability and thus contributing to sustainable construction. x | |||||
Ziólko, Jerzy; Lesniak, Alojzy | Assembly of the steel roof structure for the football stadium in Gdansk | Steel Construction | 1/2013 | 54-60 | Reports |
KurzfassungThe technology of assembling the roof over the stadium built in Gdan´sk for the EURO 2012 European Football Championship is discussed here. The stadium has a characteristic silhouette - its shape and the colours of the façade resemble a cut block of amber. The steel roof structure has a quasi-elliptical form, with a maximum diameter of 220 m and minimum diameter of 187 m. It is 38 m high and the roof girders extend 48 m over the grandstand below. The roof structure weights 7150 t and was assembled in 226 days. x | |||||
Schneider, Ronald; Fischer, Johannes; Bügler, Maximilian; Nowak, Marcel; Thöns, Sebastian; Borrmann, André; Straub, Daniel | Assessing and updating the reliability of concrete bridges subjected to spatial deterioration - principles and software implementation | Structural Concrete | 3/2015 | 356-365 | Technical Papers |
KurzfassungInspection and maintenance of concrete bridges is a major cost factor in transportation infrastructure, and there is significant potential for using information gained during inspection to update predictive models of the performance and reliability of such structures. In this context, this paper presents an approach for assessing and updating the reliability of prestressed concrete bridges subjected to chloride-induced reinforcement corrosion. The system deterioration state is determined based on a Dynamic Bayesian Network (DBN) model that considers the spatial variability of the corrosion process. The overall system reliability is computed by means of a probabilistic structural model coupled with the deterioration model. Inspection data are included in the system reliability calculation through Bayesian updating on the basis of the DBN model. As proof of concept, a software prototype is developed to implement the method presented here. The software prototype is applied to a typical highway bridge and the influence of inspection information on the system deterioration state and the structural reliability is quantified taking into account the spatial correlation of the corrosion process. This work is a step towards developing a software tool that can be used by engineering practitioners to perform reliability assessments of ageing concrete bridges and update their reliability with inspection and monitoring data. x | |||||
Kieffer, Daniel Scott; Goodman, Richard E. | Assessing scour potential of unlined rock spillways with the Block Scour Spectrum / Beurteilung der Kolkbildung in nicht ausgekleideten Hochwasserentlastungen in Fels mittels des Block Scour Spectrums | Geomechanics and Tunnelling | 5/2012 | 527-536 | Topics |
KurzfassungScour of jointed rock is an important safety issue for dams worldwide, with the cases of Kariba Dam and Ricobayo Dam illustrating the severe consequences of dam and spillway foundation erosion. Leading state-of-the-practice methods for assessing rock scour, such as the Erodibility Index Method and Comprehensive Scour Model, consider the influence of rock mass jointing on scour development, but current models have yet to fully consider the three dimensional mechanics and kinematics of rock block removal. x | |||||
Spagnoli, Giovanni; Feinendegen, Martin; Ziegler, Martin | Assessing the clogging potential of clay/additive / mixtures by cone pull-out tests | Geomechanics and Tunnelling | 4/2019 | 362-371 | Topics |
KurzfassungClogging can be a massive problem during the mechanized excavation of tunnels. Soil conditioning with foams and/or polymers is normally used in these cases to decrease the adverse effect of clogging. In a research project the cone pull-out test was used to assess the variation of adherence for four sticky clays with four commercial additives. Results show that the additives have also an impact on the basic mechanical properties of the clays such as liquid limit, plasticity index and shrinkage limit. The tests were performed on the one hand by spraying the additives on the metal surface of the cone and on the other hand by directly mixing them to the clays to reach the critical consistency index (i.e. where the maximum adherence with water was observed). Sprayed cone tests show for two clays a decrease in adherence. However, by directly mixing the additives to the clay, adherence considerably decreases, except for one kaolinitic clay. The results can be useful to select suitable additives or to develop new ones considering the geotechnical and mineralogical properties of the excavated clays. x | |||||
Feldmann, Markus; Schaffrath, Simon | Assessing the net section resistance and ductility requirements of EN 1993-1-1 and EN 1993-1-12 | Steel Construction | 4/2017 | 354-364 | Articles |
KurzfassungIn Eurocode 3 the strength functions are derived from simple engineering models, which always require a certain degree of material ductility. With regard to high-strength steels and the accuracy of the design models themselves, several problems are involved due to a lack of sound consideration of the plastification and damage process. Additionally, the current ductility requirements of EC3 obstruct the use of high-strength steels with fy > 500 MPa. Within the current revision of EC3, comprehensive investigations have been conducted to overcome these obstacles. To complement extensive experimental tests, improved numerical methods considering damage mechanics have been used to predict the real plastification and damage process for relevant details. The numerical models were validated by comparing them with experimental results. Subsequently, a parametric study was conducted to investigate the influence of strength and toughness properties separately. It could be shown that the reduction factor of 0.9 to account for the net section resistance can be omitted if cracks can be excluded. Furthermore, it became clear that a strain requirement based on the uniform elongation &egr;u is not appropriate. Moreover, it was revealed that the yield ratio fu/fy has a significant impact on the toughness requirements necessary to reach the full net section resistance. Owing to a lack of minimum upper-shelf toughness requirements in delivery standards, which would secure an appropriate inner damage resistance of the material, a substitution criterion is proposed. x | |||||
Eichinger, Stefanie; Leis, Albrecht; Boch, Ronny; Seywald, Christian; Dietzel, Martin | Assessment and formation mechanisms of scale deposits in tunnels of the ÖBB-Infrastruktur AG - A subproject of the Task Force Drainage / Bewertung von Sinter und deren Bildungsbedingungen in Tunnelbauwerken der ÖBB-Infrastruktur AG - Ein Teilprojekt der Task Force Drainage | Geomechanics and Tunnelling | 3/2020 | 273-285 | Topics |
KurzfassungScale deposit formation in drainage systems of railway tunnels represents a major challenge for their functionality and maintenance. The removal of these scale deposits causes high costs and restrictions of system availability. Effective measures to reduce scale deposit formation range from specification of the composition and structure of building materials to the application of tailored prevention and cleaning strategies. This requires advanced knowledge of the origin and type of scale deposits. The aim of this study is a systematic compilation, characterization, classification, and evaluation of scale deposits in relation to their formation mechanisms and the influence of variable environmental factors. The scale deposits from the 16 investigated tunnels mainly consist of the minerals calcite, aragonite, brucite as well as iron (hydr)oxides and detrital components. Four major types of scale deposits are distinguished: (i) unconsolidated-particulate, (ii) shard-like, (iii) porous, and (iv) compact scales. Types (ii) to (iv) show clear indications of microbial activity affecting the formation and appearance of individual deposits by various metabolic processes. The determining factors for the formation of scales - in addition to the geogenic composition of the aqueous solutions in the drainage system (groundwater / surface water) - are the variable interaction of these waters with the binding agents of the building materials used and the tunnel atmosphere. Geogenic conditions and technical-operational specifications of a tunnel determine the type and character of scale deposits, which can be actively influenced based on the case-specific reaction mechanisms by individual adaptations of environmental conditions. x | |||||
Aras, F. | Assessment of a steel-based solution for the refurbishment of a historical palace | Steel Construction | 3/2010 | 169-175 | Articles |
KurzfassungThis study aims to present the details of an earthquake-based refurbishment for the historical masonry of Beylerbeyi Palace, which has masonry walls and timber floors. Both the linear and non-linear analyses of the three-storey structure have proven that the timber floor system of the palace causes the structural masonry walls to displace independently and not transmit lateral earthquake loads. One solution to this problem that was tried was the replacement of the timber floor system by steel truss floors. On the other hand, the historical importance of the palace and the minimum intervention principle in the refurbishment of the cultural building stock meant that this strategy had to be limited to the roof of the palace. In doing so, an easy installation process, an undamaged historical fabric and a reversible strategy was expected. In this respect, four different applications of steel floor systems have been investigated for the roof of Beylerbeyi Palace. x | |||||
Lehmden, Alexander | Assessment of Dryfix masonry adhesive in terms of building physics compared to conventional bonding / Betrachtung der bauphysikalischen Gleichwertigkeit des Dryfix-Planziegel-Klebers | Mauerwerk | 3/2014 | 164-168 | Fachthemen |
KurzfassungDryfix masonry adhesive is celebrating its 10-year anniversary in 2014. The Dryfix system has been introduced to and approved in ten European countries: Austria, Germany, France, Poland, Italy, Slovenia, Croatia, Hungary, Slovakia and the Czech Republic. Every year, 25.000 housing units throughout Europe are built with Dryfix. x | |||||
Sugiura, K.; Hashimoto, K.; Oshima, Y.; Yamaguchi, T. | Assessment of fatigue cracks in orthotropic steel decks | Steel Construction | 3/2009 | 175-180 | Articles |
KurzfassungThis study proposes a new “health” evaluation system for fatigue cracks in orthotropic steel bridge decks by measuring the strain changes in the asphalt pavements on steel plate decks. In order to consider the applicability of this system, parametric FE analyses are carried out in which the types of crack, their positions and their lengths are varied. From these analytical results it was discovered that the strain changes in the asphalt pavement on steel plate decks due to the lengths and positions of cracks can be significant enough to be detected. x | |||||
Keiper, K.; Crapp, R.; Amberg, F. | Assessment of the interaction of TBM and rock mass in rock tunnelling based on geomechanical calculations / Bewertung der Interaktion von TBM und Gebirge im Felstunnelbau auf der Basis von geomechanischen Berechnungen | Geomechanics and Tunnelling | 5/2010 | 534-546 | Topics |
KurzfassungContinuous tunnelling in rock under deep overburden necessitates - particularly when a tunnel boring machine (TBM) with shield is used - extensive consideration of the processes of stress transfer resulting from the advance of the tunnel. In order to design the constructional layout of the TBM, it must be possible to estimate the actions to be expected on the cutterhead, shield skin and shield tail. x | |||||
Küpferle, Jakob; Röttger, Arne; Alber, Michael; Theisen, Werner | Assessment of the LCPC abrasiveness test from the view of material science / Bewertung des LCPC-Abrasivitätstests aus werkstofftechnischer Sicht | Geomechanics and Tunnelling | 3/2015 | 211-220 | Topics |
KurzfassungThe abrasiveness of crushed rock is determined in the design phase of a tunnelling project to estimate the wear on excavation and boring tools, using for example the LCPC abrasiveness test. Considered from the point of view of material science, there are problems with the validity of such an index value since important tribological factors, like for example the internal structure of the sample impeller (size, phase composition) are not considered in the current testing standard (AFNOR P18-579). In this investigation, LCPC tests were performed with impellers of various steels of the same and different hardnesses against two abrasives (Mohs hardness 7, 9) in order to determine the influence of the internal structure and the associated tribo-mechanical properties on the LCPC index value (ABR). In addition to the material hardness required by the standard (60 to 75 HRB ≈ 105 to 140 HV 10 according to DIN EN ISO 18265-2013), sample materials with higher hardness values were also used in order to extend the basis of the LCPC abrasiveness index to these practically applicable material groups. The results make clear that awareness has to be raised regarding the materials used for the LCPC test. An abrasive can be classified differently just by using various materials of the same hardness. In order to obtain reliable and reproducible index values for the abrasiveness of crushed rock, it is necessary to consider the influence of materials in future recommendations for the LCPC. x |