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Autor(en) Titel Zeitschrift Ausgabe Seite Rubrik
Vrettos, Christos; Merz, Kai Grenzen der Anwendbarkeit der DIN 4019 für geschichtete Böden geotechnik 3/2014 204-209 Berichte

Kurzfassung

Konventionelle Berechnungen von Setzungen und Verdrehungen von Fundamentkörpern erfolgen auf der Basis von Lösungen der Elastizitätstheorie. Das Verfahren der DIN 4019 basiert auf der Annahme, dass die Verteilung der vertikalen Spannungen im Boden unabhängig vom Steifemodul und der Poissonzahl ist. Bei Böden mit unregelmäßiger Schichtung und einer steiferen oberen Schicht, wie diese bei Baugrundverbesserungsmaßnahmen auftreten kann, führen die Lösungsalgorithmen zu ungenauen Ergebnissen, die zu einer unwirtschaftlichen Bemessung führen. Der Beitrag erläutert die Hintergründe anhand eines Rechenbeispiels.

Limits of the applicability of DIN 4019 for layered soils.
Conventional calculations of settlement and rotation of foundations are based on solution of linear elasticity. It is assumed that the distribution of vertical stresses in the soil is independent of the constrained modulus and the Poisson's ratio. For soils with irregular stratigraphy and a stiffer upper layer, as this may occur after ground improvement, these solution algorithms yield inaccurate results leading to uneconomical design. The paper elucidates the background by means of a calculation example.

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Vollmert, Lars Stabilisierung ungebundener Tragschichten im Straßen- und Wegebau - eine Standortbestimmung geotechnik 3/2014 210-213 Berichte

Kurzfassung

Zur Verbesserung des mechanischen Verhaltens von ungebundenen Tragschichten werden Geokunststoffe eingesetzt, die u. a. eine Bewehrungsfunktion übernehmen. Weisen die eingesetzten Geogitter eine geeignete Materialcharakteristik auf, findet die Bewehrung bereits bei sehr kleinen Verformungen statt. Zur sprachlich-technischen Differenzierung dieses Gebrauchszustandes wird der Stabilisierungseffekt als Teilmenge der Bewehrungsfunktion verstanden. Die Ausschreibung und Vergabe von Produkten und Maßnahmen kann und sollte auf Basis der bestehenden Regelwerke und CE-Kennzeichnungen für Bewehrungsprodukte mit geringfügigen Ergänzungen für kleine Verformungen erfolgen. Im Gegensatz zu Bindemittelverbesserungen wird die Wasserdurchlässigkeit nicht beeinflusst und die bewehrten Tragschichten verhalten sich ausgesprochen duktil.

Stabilization of unbound granular layers in road constructions - defining a benchmark.
To improve the mechanical performance of unbound granular layers in road constructions, geosynthetics are used for the function of, amongst others, reinforcement by geogrids. As far as the geogrids are characterized by a suitable mechanical specification, the granular layers are reinforced even at very low deformations. For verbal and technical clarification the stabilization effect is understood as part of the reinforcement function. Tenders, bids, acceptances and contracts for products shall be worked out based on technical regulations and CE-marking documents for reinforcing products with slight additions, taking low strain and serviceability limit states into consideration. In opposite to layers mixed with binders, the water permeability is not influenced by this measure, and geogrid reinforced layers can be characterized by extraordinary ductility.

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DGGT-Mitteilungen 3/2014 geotechnik 3/2014 214-217 DGGT-Mitteilungen

Kurzfassung

10th International Conference on Geosynthetics und 33. Baugrundtagung 2014 in Berlin
33. Baugrundtagung 2014
Versammlungen und Sitzungen während der 33. Baugrundtagung
34. Baugrundtagung 2016 in Bielefeld
10. ICG 2014
ISSMGE International Society for Soil Mechanics and Geotechnical Engineering
IAEG International Association for Engineering Geology and the Environment
ISRM International Society for Rock Mechanics
Zeitschrift geotechnik
DGGT-Mitgliederverzeichnis
Teilnahme am SEPA-Lastschriftverfahren (Dr. Kirsten Laackmann)
Aus der DGGT-Nachwuchsförderung (Dipl.-Ing. Stefan Hechendorfer)

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Tagungsberichte: geotechnik 3/2014 geotechnik 3/2014 217-218 Tagungsbericht

Kurzfassung

International German-Indian Workshop “All Aspects Related to Liquefaction” (Prof. Rolf Katzenbach)
South Baltic Conference on Dredged Materials in Dike Construction (Fokke Saathoff)

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CBTR-Nachrichten: geotechnik 3/2014 geotechnik 3/2014 218-219 CBTR-Nachrichten

Kurzfassung

CBTR-Tagung 2015: Bautechnik, Baubetrieb und Baurecht in Wien (Dr. jur. Günther Schalk)
Das aktuelle Urteil: Darf sich eine Baufirma auf Planungsleistungen zum Baugrund verlassen? (Dr. jur. Günther Schalk)

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Persönliches: geotechnik 3/2014 geotechnik 3/2014 220-221 Persönliches

Kurzfassung

Gerhard Reik (1938-2014). (Edwin Fecker)
Dr.-Ing. Erwin Gartung 75 Jahre. (Dr. Ulrich Henken-Mellies, Dr.-Ing. Bernd Müllner)

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geotechnik aktuell 3/2014 geotechnik 3/2014 221-222 geotechnik aktuell

Kurzfassung

Bilfinger installiert Fundamente für Offshore-Windpark Sandbank
Installation der Windturbinen im Offshore-Windpark DanTysk beendet
Bahn vergibt Rohbauarbeiten für Tunnel Rastatt
Vereinheitlichung des Marktauftritts

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Zuschrift zum Beitrag "Geotechnische Bedingungen in der Schachtanlage Konrad - Auffahrung von Strecken und Kammern in druckhaftem Gebirge" von Jochen Stahlmann et al. geotechnik 3/2014 223-224 Zuschrift

Kurzfassung

Zuschrift zum Beitrag “Geotechnische Bedingungen in der Schachtanlage Konrad - Auffahrung von Strecken und Kammern in druckhaftem Gebirge” von Jochen Stahlmann et al. (geotechnik 2/2014, S. 129-137, DOI: ). (Von em. Prof. Dr.-Ing. habil. Dr. h.c. Gerd Gudehus, Institut für Boden- und Felsmechanik, Karlsruher Institut für Technologie, Engler-Bunte-Ring 14, 76131 Karlsruhe, gerd.gudehus@kit.edu)
Stellungnahme der Autoren (Univ.-Prof. Dr.-Ing. Joachim Stahlmann, Technische Universität Braunschweig, Institut für Grundbau und Bodenmechanik, Beethovenstraße 51b, 38106 Braunschweigj.stahlmann@tu-braunschweig.de)

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Termine: geotechnik 3/2014 geotechnik 3/2014 224-226 Termine

Kurzfassung

Keine Kurzfassung verfügbar.

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zu J. Stahlmann, C. Missal, P. Hahn und T. Edel: Geotechnische Bedingungen in der Schachtanlage Konrad - Auffahrung von Strecken und Kammern in druckhaftem Gebirge geotechnik 3/2014 224 Erratum

Kurzfassung

Keine Kurzfassung verfügbar.

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Jäger, Wolfram Masonry - on its way to Europe / "Mauerwerk" - auf dem Weg nach Europa Mauerwerk 3/2014 117 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Schoch, Torsten The M1 energy-plus masonry house / Das M1 Energieeffizienzhaus Plus Mauerwerk 3/2014 118-138 Fachthemen

Kurzfassung

Masonry construction - the dominant construction style for new residential buildings in Germany - can and must demonstrate its sustainability in terms of energy-efficiency. The M1 energy-plus masonry house is a pilot project that provides the first practical demonstration of how the benefits of masonry construction - such as its loadbearing capacity, fire safety and sound insulation - can be combined with current and anticipated energy-efficiency standards. A compound blockwork system with different bulk densities and strength classes has been used here for the first time, combining all the advantages of high thermal insulation and heat storage in a monolithic construction (YTONG Energy ). With simple, well-thought-out design details and carefully matched technical construction equipment, masonry energy-plus houses are no longer just a vision. The main focus of the M1 project is to develop a cost-efficient and saleable product which opens up new opportunities for consumers, designers and developers alike.

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Graubner, Carl-Alexander; Pohl, Sebastian Masonry - a sustainable building material / Mauerwerk - ein nachhaltiges Baumaterial Mauerwerk 3/2014 139-150 Fachthemen

Kurzfassung

The construction and real estate industry in general and residential buildings in particular are essential pillars of the national sustainability strategy in Germany and extremely important for resilient socio-economic development. By performing life-cycle examinations of different building types, the Institute for Concrete and Masonry Structures at Darmstadt University of Technology has analysed the sustainability characteristics of residential masonry buildings with regard to common German sustainability certification systems. This paper gives an overview of the key findings of the examinations. It is a condensed version of the authors’ article for the 9th International Masonry Conference 2014 in Portugal [1] and at the same time a preview of a forthcoming paper in this journal (Vol. 18, No. 5).

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Brameshuber, Wolfgang; Saenger, Dorothea; Winkels, Bernd Recent developments in masonry construction / Neuere Entwicklungen im Mauerwerkbau Mauerwerk 3/2014 151-163 Fachthemen

Kurzfassung

Thanks to innovative ideas, it has been possible in recent years to advance the development of masonry construction. In response to the stricter requirements for the thermal insulation of buildings, the thermal insulation properties of masonry are continually being improved. Larger masonry units, improved mortar application techniques and prefabricated wall elements all make it possible to improve the efficiency of masonry construction and counteract the increase in labour costs. In parallel to the development of the material, the behaviour of the built masonry and its components when subjected to load is analysed in ever greater detail, in many cases using numerical models. The objective is a better understanding of the load-bearing behaviour of masonry in order to be able to use its various components more efficiently and hence to save material.

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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

Kurzfassung

Dryfix 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.
In addition to the mechanical properties of the polyurethane adhesive, the properties of building physics such as thermal insulation, fire resistance and sound insulation were investigated in connection with brick masonry. On the basis of sound and fire tests with brick masonry walls, it was possible to demonstrate that the material is equivalent to conventional materials. In addition, the thermal insulation of brick masonry is improved because of the joint-less bond of the blocks and the omission of the mortar joint which acts as a thermal bridge. This report is intended to summarise the status of the building physics assessment and optimisation achieved in order to provide secure data for the practical application of Dryfix masonry adhesive.

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Schoch, Torsten; Pallesen, Niels Jorgen The clever compound solution - the Ytong Energy+ / Die clevere Compound Lösung - der Ytong Energy+ Mauerwerk 3/2014 169-175 Fachthemen

Kurzfassung

The development of EU regulations dealing with energy conservation will sooner or later lead to changes in all member states - usually involving stricter insulation targets. In all markets traditionally dominated by solid construction methods, this development may make it harder for the monolithic construction method to retain its market share, because both the physical and commercial limitations - to a certain extent - appear insurmountable. The obvious solution seems to be to resort to thicker insulation material. But there are other alternatives. One of them has been developed initially specifically for the Scandinavian market where the climate has traditionally dictated tough thermal insulation requirements. In Denmark for example, U-values of 0.15 W/(m²K) are considered standard today. With conventional thermal conductivity, this U-value presents a challenge even when using autoclaved aerated concrete if one wants to retain familiar, commercially viable wall dimensions. But there are other possibilities: the compound solution offered by the Ytong Energy+ block.

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Graubner, Carl-Alexander; Schmitt , Michael; Förster, Valentin Design tables for URM / Hilfsmittel für die praxisnahe Bemessung von unbewehrtem Mauerwerk Mauerwerk 3/2014 176-187 Fachthemen

Kurzfassung

Due to the coming introduction of Eurocode 6 (DIN EN 1996) in Germany many structural engineers ask for design assistances in order to apply the regulations and to accomplish the calculations in a cost-effective manner. At the same time however, such design tables must result in efficient solutions with respect to the materials used because masonry has to compete with other building materials. This article adresses this issue. Design tables to determine the load bearing capacity using the very simplified and simplified calculation methods in accordance with DIN EN 1996-3/NA are presented. Additionally diagrams for assessing the required minimum load on external walls exposed to wind loads and for determining the size of basement walls subjected to lateral earth pressure are given. This leads to the conclusion that, in almost all practical cases, it is possible to determine the cross-section resistance of unreinforced masonry in accordance with Eurocode 6 quickly and effectively while still making the best possible use of the materials employed.

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Gellert, Christoph; Butenweg, Christoph Seismic analysis of masonry structures in German earthquake zones according to DIN EN 1998-1 / Erdbebenbemessung von Mauerwerksbauten in deutschen Erdbebengebieten nach DIN EN 1998-1 Mauerwerk 3/2014 188-196 Fachthemen

Kurzfassung

The earthquakes in Albstadt in 1978 (magnitude 5.7), Roermond in 1992 (magnitude 5.9), and Waldkirch in 2004 (magnitude 5.1) have made it clear that earthquake-resistant design of ma- sonry structures is also very important in Germany. In 1981, DIN 4149 (1981) “Buildings in German earthquake areas - Design loads, analysis, and structural design of buildings” was introduced, although it only contained a few requirements for masonry structures. This standard was completely revised by the Building and Civil Engineering Standards Committee “Earthquakes; Special issues” of the German Institute for Standardization (DIN) on the basis of Eurocode 8 (2004) and was replaced by DIN 4149 (2005), which contains detailed rules for the seismic design of masonry structures. In the meantime, DIN EN 1998-1 (2010) and the national annex DIN EN 1998-1/NA (2011) became available, which were adopted by the building supervisory board after integrating the results of application tests performed and replace DIN 4149 (2005). The following article provides an overview of the seismic calculation and analysis of masonry structures according to the European codes and illustrates their application on a sample structure.

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Tomazevic, Miha Testing of small-scale models of masonry buildings on simple earthquake simulators: possibilities and limits / Tests mit kleinformatigen Modellen von Mauerwerksgebäuden auf einfachen Erdbebensimulatoren: Möglichkeiten und Grenzen Mauerwerk 3/2014 197-205 Fachthemen

Kurzfassung

Experience regarding the testing of models of masonry buildings on simple shaking tables is discussed. It is stressed that because scale effects affect some phenomena and influence the dynamic response, only overall seismic behaviour of structural systems can be studied by testing reduced size models, and not structural details. The basic principles of physical modelling are explained and options for preparing different types of models presented. The test facility, needed for simulation of earthquake ground motion, is described and pointers are given for the selection of simulated earthquakes. Some practical cases of model shaking table studies are also presented.

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Schermer, Detleff Hybrid testing of masonry structures subjected to seismic loading / Hybride Versuche an Mauerwerkskonstruktionen unter Erdbebenbeanspruchung Mauerwerk 3/2014 206-212 Fachthemen

Kurzfassung

The combination of experiments and numeric description in a test makes it possible to realistically investigate almost any type of system subjected to dynamic loading without requiring the extremely expensive device of a shaking table. With the numeric approach it is possible to examine the behaviour of even very large and complex structures, thus reducing the experimental investigations to the essential part of the system - for example, bracing masonry walls. This test method has proved to be very helpful, particularly for the investigation of seismic loading, and it allows the synchronous examination of several force and displacement variables (horizontal, vertical, rotational). A new laboratory is presented for the investigation of full-scale building structures up to three storeys high.

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Gunkler, Erhard; Dashkhuu, Odontsetseg On the loadbearing capacity of masonry walls subjected to concentrated end strip loads / Zur Beanspruchbarkeit von Mauerwerkwänden durch Teilflächenlasten an Wandenden Mauerwerk 3/2014 213-221 Fachthemen

Kurzfassung

Concentrated loads in masonry walls are caused by point loads resulting from beams or columns perpendicular to the horizontal joint. In theory, locally occurring multi-axial stress conditions lead to compressive stress underneath the area subjected to the load, the numerical values of which are greater than the mono-axial compressive strength of the masonry. Load increase factors derived from this and stated in [1] and [2] were last determined in Germany approx. 30 years ago [3] using standard test specimens (in accordance with [4]) and not using walls. The types of masonry investigated at the time were made up of types and sizes of masonry units and of types of mortar and joint configurations that were common at the time; this however no longer appears current. The loadbearing capacity of the wall was completely ignored. In view of current structural design methods based on EC 6 [5] where applied and internal force variables in building elements are compared, this remains unsatisfactory.
For this reason, experimental and theoretical investigations of partially loaded walls (l/h/t = 1.875/1.75/0.115 m) made of aerated concrete and brick masonry with thin-layer mortar were carried out at the Ostwestfalen-Lippe University of Applied Sciences. In addition to the type of masonry unit, the detail of the perpendicular joint was varied (with mortar (v) versus without mortar (uv)). Below follows a report on the result of these investigations.

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Kubica , Jan; Mojsilovic´, Neboj a Reinforced masonry in Europe - Working strategy for the preparation of the State of the Art Report / Bewehrtes Mauerwerk in Europa - Arbeitsstrategie für die Erstellung des State-of-the-Art-Reports Mauerwerk 3/2014 222-228 Fachthemen

Kurzfassung

The behaviour of reinforced masonry structures, especially when reinforcement is provided to enhance the mechanical properties, i.e. different strength types or resistance of masonry, is still not completely investigated or thoroughly understood. A significant lack of knowledge can be observed in many areas, especially in Europe. As a result of this situation, the Commission W023 - Wall Structures of the International Council for Research and Innovation in Building and Construction (CIB) set up a Working Group (WG5) - Reinforced and Prestressed Masonry a few years ago, of which the authors are convenors. The first task of the WG5 is to produce a State of the Art document covering reinforced masonry applications in order to identify topics for future research and development. This document will serve as a contribution for the revision of European Structural Masonry Code EN 1996-1-1:2005 (Eurocode 6) [1], which is planned to be done between 2015 and 2018. It was agreed at the last W023 Commission Meeting held in Eindhoven in October 2013 that the preparation of the State of the Art document should cover the specific experience and problems connected with reinforced and prestressed masonry structures under static and dynamic/seismic loading, also outside Europe. The process of preparing such a report is now underway and the following article describes the planned scope of the document.

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Jäger, Wolfram; Pech, Anton Background of the values for compressive strength of masonry acc. to EC 6 - evaluation of data / Hintergrund der Druckfestigkeitswerte für Mauerwerk im Eurocode 6 - Datenauswertung Mauerwerk 3/2014 229-238 Fachthemen

Kurzfassung

In accordance with EN 1996-1-1 [1] the compressive strength of masonry is determined with the help of power functions. For this purpose, the standard includes values in Table 3.3 which were established by evaluating available test values in 2001/2002. In this article the theoretical background for the evaluation of the database is explained and a practical procedure is introduced which was applied at the time in order to be able to list values in EN 1996-1-1.
This article does not discuss individual combinations of masonry units and mortar. It only presents in summary the methodology and the underlying mathematical basis. The purpose of this contribution is to provide the countries in need of specific evaluations support for the anticipated update and adaptation of EC 6.

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Straube, Berit; Schoch, Torsten The durability of autoclaved aerated concrete / Dauerhaftigkeit von Porenbeton Mauerwerk 3/2014 239-245 Fachthemen

Kurzfassung

In order to be able to better assess the durability of autoclaved aerated concrete, a number of research activities have been carried out in the past. As a result of these studies, a new requirement was defined for autoclaved aerated concrete. The overall shrinkage rate, tested according to DIN EN 680, must be smaller than 0.4 mm/m. This article describes and discusses contributing factors and the background to this new requirement.

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Venter, Werner Fibre reinforcement material in solid construction / Faserverbundbewehrung im Massivbau Mauerwerk 3/2014 246-257 Fachthemen

Kurzfassung

Glass-fibre reinforcement is enjoying increasing popularity in solid construction and masonry buildings. The first approvals for the material have been obtained in Europe. It is possible to carry out the structural design of components with glass-fibre reinforcement based on EC 2 and EC 6 in combination with the fib Technical Bulletin.
The rapid development of fibre-reinforced plastics (FRPs) offers completely new alternatives to conventional reinforcement steel which are significantly more durable, do not have any metal properties and feature a significantly better energy footprint.

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