Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Mühl, Bernd; Ebner, Dieter | An amazing ring - Die neue ÖAMTC-Zentrale - Ein architektonisches Highlight an der Wiener Südosttangente | Stahlbau | 5/2017 | 380-390 | Fachthemen |
KurzfassungAm Standort Baumgasse 129 im dritten Wiener Gemeindebezirk, unmittelbar an der am stärksten befahrenen Straße Österreichs, wurde im März 2017 die neue Zentrale des Österreichischen Automobil-, Motorrad- und Touringclub ÖAMTC eröffnet. Auf neun Ebenen des so genannten Mobilitätszentrums, mit einer Bruttogeschossfläche von 27 000 m2, entstanden Büro-, Konferenz- und Schulungsräumlichkeiten. Diese bieten ein innovatives Arbeitsumfeld für rund 800 Mitarbeiter und fassen gleichzeitig fünf Bürostandorte zentral zusammen. Das Gebäude ist in Form einer Felge mit fünf “Bürospeichen” angelegt. Die 230 m lange und beinahe 17 m hohe Ringfassade ist das architektonische Highlight der neuen ÖAMTC-Zentrale und bildet gleichzeitig das verbindende Element, das sich von Speiche zu Speiche erstreckt und somit einerseits als Schutzwand zur Wiener Südosttangente dient, andererseits konnten so die Fluchtwege aus den Büroräumlichkeiten konstruktiv in die Stahlkonstruktion integriert werden. Somit konnten die Tiefen des Bürogebäudes ausgenutzt und die Massivtreppenhäuser kleiner gehalten werden. Die prominent positionierte Stahl-Glaskonstruktion der Ringfassade konnte durch den konsequenten Einsatz von BIM-(Building Information Modeling)Technologien im Zuge der Ausführungsplanung durch das Zusammenspiel der planenden Architekten, des Tragwerksplaners und der ausführenden Unternehmen umgesetzt werden. Für die Ringfassade, die Hochgarage, den Hangar, den Heliport sowie die sieben Atriumstiegen zeichnet die international tätige Unger Steel Group aus Oberwart/Österreich verantwortlich. x | |||||
Bedair, Osama | An analytical expression to determine "realistic" shear buckling stress in cold-formed lipped channels | Steel Construction | 1/2015 | 53-58 | Articles |
KurzfassungCurrent 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 %. x | |||||
Ballio, G.; Bernuzzi, C.; Castiglioni, C. A. | An approach for the seismic design of steel storage pallet racks (Ein Verfahren zur Bemessung stählerner Palettenlager unter seismischer Einwirkung) | Stahlbau | 11/1999 | 919-928 | Fachthemen |
KurzfassungObwohl der Bau stählerner Palettenlager bereits seit einigen Jahrzehnten eines der bedeutendsten Anwendungsgebiete für kaltgewalzte Stahlprofile darstellt, wurden in letzter Zeit geeignete Berechnungsverfahren lediglich für nicht alternierende Belastung angegeben. Die Beschreibung des Bauteilverhaltens von Schlüsselkomponenten der Regalanlagen und folglich die Ableitung bemessungsrelevanter Parameter für Bauteile und Anschlüsse erfordert spezielle experimentelle Untersuchungen. Mittels Nachrechnung der Versuchsergebnisse kann die Bemessung der Regalsysteme für statische Belastungen unter angemessener Nutzung des derzeitigen, in den Normen verankerten, Wissensstandes hinsichtlich traditioneller kaltgewalzter Profile durchgeführt werden. Bezüglich der Bemessung unter seismischer Einwirkung wurde bisher keine ausgedehnte Forschungsaktivität entwickelt, und die einzigen, diesbezüglichen Hinweise geben die "U.S.A Rack Manufacturing Specifications", während sich der Eurocode 8 (Europäische Bemessungsvorschrift für die Erdbebensicherheit von Bauwerken) nicht auf Hochregalsysteme bezieht. In diesem Beitrag werden die derzeit am Politecnico di Milano durchgeführten Untersuchungen zur Entwicklung vereinfachter Bemessungsregeln für stählerne Palettenlager in Erdbebengebieten vorgestellt. Eine aus jüngeren Forschungsergebnissen bezüglich traditioneller Stahltragwerke abgeleitete Bemessungsmethode wird kurz umrissen und in geeigneter Weise auf Palettenlager aus kaltgewalzten, dünnwandigen Profilen erweitert. Darüberhinaus werden die diesbezüglich geplanten experimentellen Untersuchungen erläutert und einige "sehr frühe" Ergebnisse zum Verhalten der formschlüssigen Trägeranschlußdetails unter seismischer Wechselbeanspruchung vorgestellt. Zum Abschluß wird die numerische Phase der Forschungsarbeit erläutert, welche die Kalibrierung des vorgeschlagenen Bemessungsverfahrens an Full-Scale-Tests mit dem Erdbebensimulator zum Ziel hat. x | |||||
Tokgöz, Nuray | An assessment method for fine-grained sedimentary materials excavated by EPB TBM | Geomechanics and Tunnelling | 4/2016 | 326-337 | Topics |
KurzfassungThe aims of this study are to find a solution for the problems (lumping, adhesion, and clogging) encountered with fine-grained sedimentary materials, minimize the time and cost of excavation, and decrease the potential environmental effects due to soil conditioning chemicals used in the process of excavating a waste water tunnel. Therefore, this study will contribute important technical knowledge regarding design and implementation of excavation with TBM to the mining and construction industries as well as for optimization in mechanical engineering. x | |||||
Heerten, Georg | An die Mitglieder vom Vorsitzenden | geotechnik | 4/2011 | 297-299 | DGGT-Mitteilungen |
Berrais, Abbes; Pollitt, Kieran | An excel based design tool for end plate connections to Eurocode 3 | Steel Construction | 4/2014 | 274-279 | Reports |
KurzfassungThe design of moment-resisting joints can often be a laborious task if performed by manual calculation. This leads to potential rising of unnecessary labour costs when industry approved design tool would otherwise suffice. Steel connection designers are charged with specifying joint components such as plates, welds and bolts required that have structural capacity to transmit the loads which the connection is exposed to. This said connection design and its components need to be economical with regards to cost. However, a balance needs to be reached between the over-design of the connection leading to excessive capacities, and the finite element design that provides the connection with just what it needs to resist such loads. x | |||||
An experimental study on the local buckling strength of an SBHS700 stub column with cruciform section - with an overview of the mechanical properties of SBHS700 | Stahlbau | 7/2019 | 697 | Empfehlungen der Redaktion | |
Nie, Jing; Sugimoto, Hikaru; Ono, Kiyoshi; Miyashita, Takeshi; Matsumura, Masahide; Okada, Seiji | An experimental study on the local buckling strength of an SBHS700 stub column with cruciform section - With an overview of the mechanical properties of SBHS700 | Steel Construction | 2/2019 | 82-90 | Articles |
KurzfassungRecently, SBHS (Steels for Bridge High-Performance Structure) has been introduced in Japan because of its remarkable mechanical properties. The main features of SBHS are high yield strength, improved toughness and weldability, which are superior to conventional steel materials at the corresponding tensile strength grades. In this study, these material properties of SBHS were compared with conventional steel materials through experimental studies as well as the Japanese design specifications. The main focus of this paper is the evaluation of the local buckling strength of two SBHS700 stub columns, each with cruciform section through compression tests. The load-displacement relationship, strain bifurcation related to plate buckling and out-of-plane deformation are discussed. Two test specimens with different width-to-thickness ratio parameters RR are compared. As the results indicate, for the specimen having a larger RR, an abrupt decrease in load was observed after the peak load, whereas the decrease in load for the specimen with a smaller RR proceeded gradually after the peak load with a much larger vertical displacement. In terms of local buckling strength, it was found to be possible to evaluate the SBHS700 stub column with cruciform section based on the existing ultimate strength curves. x | |||||
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 |
KurzfassungA 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. x | |||||
Schoch, Torsten | An impressive preview.... / Eine eindrucksvolle Vorausschau.... | Mauerwerk | 5/2018 | 289-290 | Editorial |
Debernardi, Pier Giorgio; Taliano, Maurizio | An improvement to Eurocode 2 and fib Model Code 2010 methods for calculating crack width in RC structures | Structural Concrete | 3/2016 | 365-376 | Technical Papers |
KurzfassungThe analysis of the mechanical behaviour of a reinforced concrete tie subjected to a monotonic loading in the stabilized cracking stage is performed here by way of a theoretical general model that considers the effect of the so-called Goto cracks (secondary cracks). It is shown, in particular, that the average bond stress along the transmission length depends not only on the concrete strength as assumed by the fib Model Code for Concrete Structures 2010, but also on reinforcement ratio and bar diameter. In this regard, tabulated theoretical values of the average bond stress are proposed as a function of the aforementioned parameters. Moreover, the secondary cracks reduce the effect of tension stiffening on the relative mean strain. On the basis of the main results obtained with the general model, some improvements are suggested for the calculation methods proposed by fib Model Code 2010 and Eurocode 2 concerning the average value of the bond stress and taking into account the influence of the secondary cracks on the mean deformation. An improved calculation method is therefore performed. Finally, the theoretical results of crack spacing and crack width obtained with the general and improved methods are compared with experimental data obtained from extensive research on RC ties. x | |||||
Yamamura, N.; Hasegawa, S. | An Influence-Line Analysis of Geometrical Non-Linear Bridges vy the Finite Displacement Method (Geometrisch nichtlineare Schnittkraftermittlung von Brücken über Einflußlinien mit Hilfe der Finiten-Verschiebungsmethode). | Stahlbau | 3/1986 | 90-94 | Berichte |
Fruhwirth, Rudolf K.; Hofstätter, Herbert | An innovative approach for optimising geothermal energy recovery / Tiefe geothermische Energiegewinnung - Innovative Wege zur Optimierung | Geomechanics and Tunnelling | 5/2016 | 489-496 | Topics |
KurzfassungThe overall economics of a geothermal project are basically governed by the formation temperature gradient and the productivity of the reservoir. At the Chair of Petroleum and Geothermal Energy Recovery, a simulator has been developed considering different well geometries and casing strings or liner completions as well as total or partial cementation. In order to optimize heat transfer or to minimize losses, various tubing types like gas- or vacuum isolated pipes as well as relined or outside coated pipes can be simulated. The program also allows the simulation of transient states as well as the circulation of various media with various rates in closed systems. This enables the optimisation of energy recovery by simulating various materials and circulation rates over a long term, which is essential for the evaluation of the economical limits and energy efficiency of a geothermal project. The program can also be used for the simulation of oil and gas production since the conservation of energy results in less friction losses and higher flow velocities in gas wells which finally results in better deliquification behaviour. x | |||||
Berger, Johannes; Bruschetini-Ambro, Sebastian Zoran; Kollegger, Johann | An innovative design concept for improving the durability of concrete bridges | Structural Concrete | 3/2011 | 155-163 | Articles |
KurzfassungIt is proposed to build concrete bridges with tendons fully encapsulated in plastic ducts and without the use of reinforcing steel. In this case the durability of the proposed bridge depends only on the durability of the concrete because corrosion is no longer a determining factor regarding the lifetime of the structure. The requirements of the serviceability and ultimate limit states are fulfilled by providing post-tensioned tendons with strands fully encapsulated in plastic ducts and watertight anchorages. Since the proposed bridge does not contain any steel, which would be endangered by material-related corrosion, there is no need for insulation to the deck. Consequently, there is also no need for pavement and edge beams. This concept of building bridges represents a breakthrough with regard to sustainability and durability of concrete bridges and is applicable to small and mediumsized bridges. The method has already been implemented for the design of the Egg-Graben Bridge in the Großarl valley in the province of Salzburg, Austria. Prior to the actual construction of the bridge, large-scale tests were performed to obtain practical values for the serviceability, ductility and loadbearing capacity of this structural system. x | |||||
Lu, Xilin; Wang, Lu; Wang, Dun; Jiang, Huanjun | An innovative joint connecting beam for precast concrete shear wall structures | Structural Concrete | 6/2016 | 972-986 | Technical Papers |
KurzfassungThe precast shear wall structure has outstanding features for green buildings due to its construction convenience, safety, high quality and low pollution. In general, precast concrete shear walls are connected by multiple joints. The joint between precast walls has very strong influence on the whole structure, which calls for more detailed investigation. A new kind of connection - the joint connecting beam - was developed to connect the vertical reinforcement in precast concrete shear wall structures. This innovative connecting method has the advantages of convenient operation and saving steel. To evaluate the performance and for better application of the joint connecting beam, an experiment on seven full-scale specimens was conducted under cyclic loading, including two cast-in-situ walls and five precast walls with varying reinforcement and sectional heights of the joint connecting beam. A comparison was performed between cast-in-situ walls and precast walls with joint connecting beam, focusing on failure mode, hysteretic curve, skeleton curve, bearing capacity, ductility and energy-dissipating capacity. The results show that the joint connecting beam can effectively transfer the load of precast walls, especially for squat precast walls. Moreover, finite element models were developed to simulate the performance of the specimens. The simulation results agree well with experimental results. x | |||||
Seywald, Christian; Helmberger, Albert; Matt, Robert | An innovative method of upgrading old rail tunnels under continued operation - Example Rekawinkler- and Kleiner Dürreberg Tunnel / Innovative Methode zur Ertüchtigung alter Eisenbahntunnel unter Betrieb - Beispiel Rekawinkler- und Kleiner Dürrebergtunnel | Geomechanics and Tunnelling | 5/2017 | 533-541 | Topics |
KurzfassungThe ÖBB-Infrastruktur AG operates and maintains 246 tunnels and similar structures with an overall length of approx. 250 km. Nearly 150 of these structures are more than 100 years old, 35 of them are over 150 years old. Ageing processes, the impact of train traffic, ground conditions and environmental conditions are causing progressive damage to the tunnel linings, which - in order to maintain safe railway operation - requires ongoing maintenance procedures. Those procedures are carried out under a range of restrictions concerning availability, which is one of the most important principles at the ÖBB after safety. In order to obtain continuous availability of the facility, new methods of refurbishment were developed for the two double-track tunnels Rekawinkler Tunnel and Kleine Dürreberg. The described methods enabled extensive repair works of the tunnels, mostly with uninterrupted train traffic on the second track. x | |||||
Alber, M. | An Integrated Approach to Penetration, Advance Rates and Disc Cutter Wear for Hard Rock TBM Drives | Geomechanik und Tunnelbau | 1/2008 | 29-37 | Fachthemen |
KurzfassungTunnel boring machines (TBM) are increasingly used for excavating subsurface infrastructure such as road and railway, water supply and sewer tunnels, to name a few applications. When designing a hard rock TBM drive it is necessary to appreciate all interactions of the rock mass to be tunnelled with the TBM. This paper deals specifically with these interactions and suggests an integrated approach in estimating hard rock TBM performance, such as the penetration rate, the advance rate and the disc cutter wear. x | |||||
Schindler, Steffen; Hegemann, Felix; Alsahly, Abdullah; Barciaga, Thomas; Galli, Mario; Lehner, Karlheinz; Koch, Christian | An interaction platform for mechanized tunnelling. Application on the Wehrhahn-Line in Düsseldorf (Germany) / Eine Interaktionsplattform für maschinelle Tunnelvortriebe. Anwendung am Beispiel der Wehrhahn-Linie in Düsseldorf - Application on the Wehrhahn-Line in Düsseldorf (Germany) / Anwendung am Beispiel der Wehrhahn-Linie in Düsseldorf | Geomechanics and Tunnelling | 1/2014 | 72-86 | Topics |
KurzfassungThis paper introduces a holistic product model for the interactive simulation of shield tunnelling machines. The underlying product model is based on the Building Information Modelling methodology and uses the Industry Foundation Classes to classify and structure the captured data. Data from design, measurements and numerical simulation components obtained from four sub-models (ground, tunnel, tunnel boring machine and building) are stored, classified and organized on commonly available servers. The very heterogeneous data structures found in each individual model are adjusted in advance using georeferencing, transformation or other suitable methods to increase compatibility. In particular, this article describes the methodological design of an interactive product model for mechanized tunnelling in soft soil, including its sub-models. Performance is demonstrated by a case study using data from the Wehrhahn-Line subway construction site in Düsseldorf, Germany. Here, the focus is on the verification of the product model and its use in the numerical simulations. The research presented is a central component of the Collaborative Research Center SFB 837 “Interaction Modelling in Mechanized Tunnelling” at the Ruhr University, Bochum. x | |||||
Munesi, Ali; Sharbatdar, Mohammadkazem; Gholhaki, Majid | An investigation into the factors influencing the cyclic behaviour of buckling-restrained steel plate shear walls | Steel Construction | 1/2021 | 35-46 | Articles |
KurzfassungSteel plate shear walls (SPSW) are being increasingly used in steel or concrete structures as lateral load-resisting systems. Shear buckling is one of the major shortcomings of the SPSW and so to address this issue, buckling-restrained steel plate shear walls (BRSPSW) have started to appear. Owing to the novel concept of this structural system, this paper aims to investigate the effect of factors influencing the response of BRSPSWs. For this purpose, a parametric study was conducted using ABAQUS software. Based on the results acquired from the hysteretic curves, an increase in the concrete compressive strength does not markedly affect the ductility and energy dissipation capacity. Moreover, it was observed that as the width of the gap between concrete panel and steel plate grows, the energy dissipation and response modification factor are reduced. Besides, the results indicate that as steel strength increases, so energy dissipation increases from 0.7 to 11.7 %. Accordingly, based on a comparison between the rate of improvement in shear capacity arising from an increase in the strength of the concrete panels, frame and steel plate, it is concluded that it would be much more rational to increase the concrete strength so that a high shear capacity can be achieved for the BRSPSW. Lastly, in all models, as the gap width increases from 0 to 20 mm and 20 to 35 mm, ductility decreases by 41 and 30 % respectively. x | |||||
Dermentzis, Georgios; Pfeifer, Domink; Pfluger, Rainer; Ochs, Fabian; Feist, Wolfgang; Schnieders, Jürgen | An overview of energy district tools in Europe and the importance of an equivalent heating reference temperature for district simulations | Bauphysik | 5/2017 | 316-329 | Fachthemen |
KurzfassungThe international building sector plays an important role on energy policy and reduction of CO2 emissions. The focus of energy conservation has started from building level and nowadays expands to district, city, region or national level. In this study, an overview, performed within the European project Sinfonia for preparation of a new district tool with focus on energy conservation, will be presented about existing district tools. Several aspects of the tools were included in the overview, such as focus, aim, analytical approach, methodology, geographical coverage, required input data, commercial/freeware, source code, language, tool status, organization/project developing the tool, and web link. The main components of energy district tools such as 3D geographical data, data for building features and properties, and simulation methods were also addressed. x | |||||
Weise, Frank; Voland, Katja; Pirskawetz, Stephan; Meinel, Dietmar | Analyse AKR-induzierter Schädigungsprozesse in Beton | Beton- und Stahlbetonbau | 12/2012 | 805-815 | Fachthemen |
KurzfassungZur Beurteilung der Alkaliempfindlichkeit der Gesteinskörnung finden normativ der Betonversuch mit Nebelkammerlagerung bei 40 °C und alternativ der 60 °C-Betonversuch Anwendung. Als Beurteilungskriterium für den Schädigungsprozess wird bei beiden Verfahren die an Betonprismen diskontinuierlich ermittelte Dehnung herangezogen. Auch bei den zusätzlich in der Nebelkammer gelagerten Würfeln beschränkt sich die Schadensanalyse auf eine diskontinuierliche Verfolgung der maximalen Breite der Oberflächenrisse. x | |||||
Hintzen, W.; Grube, H. | Analyse beobachteter Risse in Tunnelbauwerken. | Beton- und Stahlbetonbau | 8/1995 | 203-206, 223-227 | |
KurzfassungEs werden Ursachen beschrieben und Empfehlungen zur Verhinderung von Rissen, insbesonders in Innenschalen von Tunnenbauwerken vorgestellt. Hierbei wird besonders darauf abgezielt, Zwängungen zwischen Spritzbetonschale und Innenschale durch eine Entkopplung zu erreichen. Eine weiteres Ziel ist es durch sorgfältige Qualitätssicherung des Betons eine ausreichende Frühzugfestigkeit zu gewährleisten. x | |||||
Hörner, Michael; Cischinsky, Holger; Lichtmeß, Markus | Analyse der Diskrepanz von Energiebedarf und -verbrauch bei Energiepässen von Wohngebäuden in Luxemburg - Teil 1: Methode der multiplen linearen Regression | Bauphysik | 3/2016 | 166-175 | Fachthemen |
KurzfassungIn Luxemburg wird die energetische Bewertung von Wohngebäuden seit 2008 in der Verordnung “Performance énergétique des bâtiments d'habitation” geregelt [1]. Im Fall der Erstellung eines Energiepasses für ein bestehendes Gebäude sind neben dem berechneten Energiebedarf, der als Grundlage für die Einordnung in einem Klassensystem (A, B, C, ) dient, auch der gemessene Verbrauch mit anzugeben. Bei einem neu zu errichtenden Gebäude ist der Energiepass spätestens nach vier Jahren um den gemessenen Verbrauchswert zu ergänzen. Dadurch liegen für viele Gebäude die beiden Werte, der gemessener Verbrauch und der berechnete Bedarf, vor und können gegenübergestellt werden. Wie zu erwarten war, zeigen sich systematische und teils erheblich Diskrepanzen zwischen den berechneten Werten des spezifischen Endenergiebedarfs Wärme und den zugehörigen gemessenen Verbrauchswerten. x | |||||
Hörner, Michael; Cischinsky, Holger; Lichtmeß, Markus | Analyse der Diskrepanz von Energiebedarf und -verbrauch bei Energiepässen von Wohngebäuden in Luxemburg - Teil 1: Methode der multiplen linearen Regression | Bauphysik | 3/2016 | 166-175 | Fachthemen |
KurzfassungIn Luxemburg wird die energetische Bewertung von Wohngebäuden seit 2008 in der Verordnung “Performance énergétique des bâtiments d'habitation” geregelt [1]. Im Fall der Erstellung eines Energiepasses für ein bestehendes Gebäude sind neben dem berechneten Energiebedarf, der als Grundlage für die Einordnung in einem Klassensystem (A, B, C, ) dient, auch der gemessene Verbrauch mit anzugeben. Bei einem neu zu errichtenden Gebäude ist der Energiepass spätestens nach vier Jahren um den gemessenen Verbrauchswert zu ergänzen. Dadurch liegen für viele Gebäude die beiden Werte, der gemessener Verbrauch und der berechnete Bedarf, vor und können gegenübergestellt werden. Wie zu erwarten war, zeigen sich systematische und teils erheblich Diskrepanzen zwischen den berechneten Werten des spezifischen Endenergiebedarfs Wärme und den zugehörigen gemessenen Verbrauchswerten. x | |||||
Weise, Frank; Maier, Bärbel; Ehrig, Karsten | Analyse der durch Frost- und Frost-Tausalz-Wechsel induzierten Schädigungsprozesse in Beton | Beton- und Stahlbetonbau | 12/2012 | 816-823 | Fachthemen |
KurzfassungZur Beurteilung des Frost- bzw. Frost-Tausalz-Widerstandes des Betons finden normativ als Alternativverfahren das CIF- bzw. CDF-Verfahren Anwendung. Als Beurteilungskriterium für den inneren Schädigungsprozess werden bisher ausschließlich die Änderung der Ultraschalllaufzeit und die Massezunahme durch Frostsaugen herangezogen. Die Bewertung des äußeren Schädigungsprozesses hingegen erfolgt ausschließlich mittels einer vergleichenden visuellen Beurteilung der Prüffläche und der Ermittlung der Abwitterungsmasse. Allen bisher angewandten inneren und äußeren Schädigungsindikatoren ist gemeinsam, dass ihre Aussagefähigkeit durch eine fehlende ortsaufgelöste Quantifizierung des Schädigungsprozesses eingeschränkt ist. x |