Der Alleskönner Beton ist grundsätzlich einfach, schnell und kostengünstig in der Herstellung. Er kann nahezu jede beliebige Form annehmen und wird als einziger Baustoff auch flächendeckend in Entwicklungs- und Schwellenländern eingesetzt. Beton hat aber auch seine Schattenseiten. Die Zementherstellung geht mit einem enormen CO2-Ausstoß einher. Zudem wird eine große Menge natürlicher Ressourcen, teils unnötig, verbraucht. Dennoch werden wir auch in Zukunft nicht ohne Beton auskommen, aber wir haben es in der Hand, den Betonbau nachhaltig zu verbessern. Der SFB/Transregio 280 hat zum Ziel, innovative Konzepte und Strategien für ein intelligentes Bauen mit Carbonbeton zu entwickeln. Damit dies gelingt, sind neue Denkweisen, die Änderung bewährter Denkmuster und das Zunutzemachen verschiedenster Inspirationsquellen unabdingbar. Aus diesem Grund hat der SFB/TRR 280 Kunstschaffende dazu eingeladen, sich von den Themen des Sonderforschungsbereiches inspirieren zu lassen. Ziel des Wettbewerbs war es darzustellen, dass Carbonbeton als Produkt von Wissenschaft und Technik vielfältige Beziehungen zu Kunst und Natur aufweist. Was wird sichtbar? Was bleibt dem Forschenden und was dem Außenstehenden verborgen? Wie lassen sich Natur und Carbonbeton als Kunstobjekt verbinden? Im vorliegenden Band wurden alle Einreichungen und das Making-off der prämierten Ideen zusammengestellt.:Wettbewerb - Entdeckung - Ziel 4 Ausschreibung - Ausstellung - Organisation 5 Die Jury 6 1. Platz - Leporello : Suggestion von Bewegung in statischer Präsenz 9 2. Platz - Fibonaccibikini : Hyperbolische Geometrien im Raum 13 3. Platz - Hülle : Ein poetisches Umschreiben der Leere 17 Register: 25 Graukarten 20 Flügel 22 Körperbau : Videokunst / Videoperformance 24 Asymmetrische Ausblicke : Ruhige Ausschnitte versus dynamische Form 26 Trashtopia : Eine Animation 28 Great Barriere Reef 2023 30 Terra : Zerstörung und Erneuerung 32 Nobjects . Eine Serie 34 Luftstütze : Pflanzeninspiriert 36 Die Natur im Inneren : Skulptur aus Carbonbeton 38 Aus dem Boden am Fluss 40 Chaperon 42 Supernatural - Polar 44 Botanik brut : Fotografischer Beton 46 Würfelzwilling 48 Betonkoeppe 50 Voyager 52 Forme perdu 54 Beton durchwachsen : Ein Kustobjekt aus Beton, das der Natur Raum gibt 56 Bonboo 58 QY03 60 / The all-rounder concrete is basically simple, fast and inexpensive to produce. Concrete components can assume and conserve almost any shape. It is the only building material used extensively also in developing and emerging countries. However, concrete also has its downsides. Cement production is associated with enormous CO2 emissions. In addition, a large amount of natural resources is consumed, sometimes unnecessarily. Nevertheless, we will not be able to build without concrete in the future, but we have it in our hands to improve concrete construction sustainably. The Collaborative Research Centre/Transregio 280 (in short: CRC/TRR 280) aims to develop innovative concepts and strategies for intelligent construction with carbon-reinforced concrete. For this to succeed, new ways of thinking, changing proven patterns of thought and tapping into a wide variety of sources of inspiration are essential. For this reason, we invited artists to be inspired by the research topics of CRC/TRR 280. The aim of the competition was to show that carbon-reinforced concrete, as a product of science and technology, has diverse relationships with art and nature. What becomes visible? What remains hidden to the researcher and what to the outsider? How can nature and carbon-reinforced concrete be combined as art objects? In this catalog, all submissions and the making of the award-winning ideas have been compiled.:Wettbewerb - Entdeckung - Ziel 4 Ausschreibung - Ausstellung - Organisation 5 Die Jury 6 1. Platz - Leporello : Suggestion von Bewegung in statischer Präsenz 9 2. Platz - Fibonaccibikini : Hyperbolische Geometrien im Raum 13 3. Platz - Hülle : Ein poetisches Umschreiben der Leere 17 Register: 25 Graukarten 20 Flügel 22 Körperbau : Videokunst / Videoperformance 24 Asymmetrische Ausblicke : Ruhige Ausschnitte versus dynamische Form 26 Trashtopia : Eine Animation 28 Great Barriere Reef 2023 30 Terra : Zerstörung und Erneuerung 32 Nobjects . Eine Serie 34 Luftstütze : Pflanzeninspiriert 36 Die Natur im Inneren : Skulptur aus Carbonbeton 38 Aus dem Boden am Fluss 40 Chaperon 42 Supernatural - Polar 44 Botanik brut : Fotografischer Beton 46 Würfelzwilling 48 Betonkoeppe 50 Voyager 52 Forme perdu 54 Beton durchwachsen : Ein Kustobjekt aus Beton, das der Natur Raum gibt 56 Bonboo 58 QY03 60

The microstructure of concrete contains random features over a wide range of length scales in which each length scale possess a new random composite. The influence of individual material constituents at different scales and their mutual interactions are responsible for the formation of fracture process zone (FPZ). The presence of the FPZ and the various toughening mechanism occurring in it, influences the fatigue and fracture behavior of concrete which also gets influenced by the geometry, spacial distribution and material properties of individual material constituents and their mutual interactions. Hence, in order to study the influence of interfacial transition zone, microcrack and aggregate bridging on the fracture and fatigue behavior of concrete, a multiscale analysis becomes necessary. This study aims at developing a linearized model which helps in understanding the fracture and fatigue behavior of cementitious materials by considering the predominant fracture process zone (FPZ) mechanisms such as microcracking and aggregate bridging. This is achieved by quantifying the critical microcrack length and the bridging resistance offered by the aggregates. Further, the moment carrying capacity of a cracked concrete beam is determined by considering the effect of aggregate bridging. A modified stress intensity factor (SIF) is derived based on linear elastic fracture mechanics (LEFM) approach by considering the material behavior at different scales through a multiscale approach. The model predicts the entire crack growth curve for plain concrete by considering these process zone mechanisms. Furthermore, the fracture and fatigue response of concrete is studied through the development of analytical models which include the properties of the mix constituents using the multiscale based SIF. The effect of the interfacial transition zone, microcracks and resistance offered through aggregate bridging on the resistance to crack initiation and propagation are studied. A fatigue crack growth law is proposed using the concepts of dimensional analysis and self-similarity. Through sensitivity analyses, the influence of different parameters on the overall fracture and fatigue behavior are studied. In addition, studies related to concrete-concrete bi-material interfaces are conducted in order to understand the influence of repair materials on the service life of damaged concrete structures when subjected to fatigue loading. An analytical model is proposed in this study to predict the crack growth curve using the concepts of dimensional analysis and self-similarity in conjunction with the human population growth model. It is seen that a repair done with a patch having similar elastic properties as those of the parent concrete will have a larger fatigue life.

The final thesis is focused on design of valley bridging on I/38 road at the Havlickuv Brod bypass. The thesis contains study of the bridging area. For detailed assessment was chosen, from three variants, a two-beam cross-section girder of 4 spans. Load-bearing structure is designed as cast-in-place, post-tensioned, concreted at fixed falsework without phased construction. The serviceability limit state and the ultimate limit state were assessed. The thesis contains, apart from structural design, drawings and visualizations of the bridge.

This master's thesis focuses on a preparation of a multifunctional building in Brno, on Vídeňská street. It is based on a project that has been realized in 2005. Construction-technological preparation of this project includes the design of securing of time, financial, and human resources, project of construction site layout, a design of construction machines setup, technological manual for construction of monolithic reinforced concrete structure, plan of controls and tests for quality, and a manual for obtaining permission for using public space and protection of historical tree.

The final thesis is focused on design of road bridge over a railway track. The design is processed in tree options - a cast-in-place concrete structure, brigde as a haunched beam and a prefabricated ginger bridge. The third option was chosen. To model the structure and to obtain the internal forces is used FEM computational software Scia Engineer 15.1. All calculations were performed in accordance with Eurokode.

Durch den Einsatz des 3D-Drucks mit Beton kann die Produktivität auf der Baustelle enorm gesteigert, der gesamte Bauablauf optimiert und zugleich geometrische Freiheit ohne zusätzliche Kosten realisiert werden. Jedoch bevor der Beton-3D-Druck eine breite Anwendung finden kann, müssen einige Fragen in Bezug auf die Dauerhaftigkeit sowie die Gebrauchsfähigkeit gedruckter Betonelemente erforscht werden. Im vorliegenden Aufsatz wird die Problematik der Verformungen und Rissbildung bei gedruckten Betonelementen infolge des plastischen Schwindens beleuchtet. Außerdem werden geeignete Messverfahren für die Quantifizierung von gehindertem sowie ungehindertem plastischem Schwinden von gedrucktem Beton vorgestellt.

Angetrieben von vielversprechenden Effizienzsteigerungen wird der Beton-3D-Druck stetig weiterentwickelt. Um die gewonnenen Erkenntnisse niederschwellig in die Baupraxis zu überführen, empfehlen sich druckbare Betone im Rahmen des geltenden Regelwerks. Dabei stellt die Limitierung des Mehlkorngehalts eine Herausforderung dar. Um diese zu meistern, wird eine verallgemeinerbare, numerisch unterstützte Anwendung der Korngrößenverteilung nach Andreasen und Andersen als Basis für den Betonentwurf vorgeschlagen. Experimentelle Untersuchungen haben eine gute Verbaubarkeit und hinreichende Extrudierbarkeit eines Betons mit einem 16 mm Größtkorn und einem Mehlkorngehalt von 500 kg/m³ demonstriert.

Made available in DSpace on 2014-07-29T15:03:41Z (GMT). No. of bitstreams: 1 David Rosa Rodrigues.pdf: 6647846 bytes, checksum: 0949b9b9e50ce27a724b92ea2943c5d1 (MD5) Previous issue date: 2009-09-29 / This research presents the results of an experimental comparison between the types of shear reinforcement "stud rails" and "double headed studs" to combat the punching shear of a reinforced concrete flat slabs. It also presents a comparison of experimental results with those provided under the ACI 318/2005, CEB-FIP MC/1990, EUROCODE 2/2004 and NBR 6118:2003. The motivation was to investigate the efficiency of these shear reinforcement for the differences between them. It was tested six slabs of concrete to concentric load, with dimensions of 2400 mm x 2400 mm x 150 mm. It was concreted a column of section 500 mm x 200 mm to 850 mm total height next to the slab. The main variables were the type of shear reinforcement "stud rails" x "double headed studs, the "studs" diameter and the shear reinforcement area per layer. The slabs were tested until the failure. It was monitored the deflection, reinforcement deformation of bending and shear. All slabs failed by punching with internal surface rupture. The experimental results after being compared with the expected standard in each individual calculation showed conservative values. Slabs of Group 1 with "stud rails" presented failed loads greater than those in Group 2 with "double headed studs. Codes/standards 318/2005 ACI, CEB-FIP MC/1990, EUROCODE 2 / 2004 and NBR 6118:2003 safely predict the failed loads of all slabs. The base of the shear reinforcement type "stud rails" moving inside the column may have reduced the failed load of the slab L3. Shear reinforcement type stud rails it is easer of assembly and play than the type double headed studs . / Esta pesquisa apresenta os resultados de uma comparação experimental entre os tipos de armadura de cisalhamento stud rails e double headed studs para combate à punção em lajes cogumelo de concreto armado. Apresenta, também, uma comparação dos resultados experimentais com os previstos segundo o ACI 318/2005, CEB-FIP MC/1990, EUROCODE 2/2004 e a NBR 6118:2003. A motivação foi investigar a eficiência destas armaduras de cisalhamento a procura de diferenças entre elas. Foram ensaiadas seis lajes maciças de concreto armado à punção centrada, com dimensões 2400 mm x 2400 mm x 150 mm. Foi concretado junto à laje um pilar de seção 500 mm x 200 mm com altura total 850 mm. As principais variáveis foram o tipo de armadura de cisalhamento: stud rails x double headed studs , o diâmetro dos studs e a área de armadura de cisalhamento por camada. As lajes foram ensaiadas até a ruptura. Foram monitoradas as flechas, deformações da armadura de flexão e cisalhamento. Todas as lajes romperam por punção com superfície de ruptura interna. Os resultados experimentais após serem comparados com os esperados segundo cada norma de cálculo apresentaram valores conservadores. As lajes do Grupo 1 com stud rails apresentaram cargas de ruptura maiores que as do Grupo 2 com double headed studs . Os códigos/normas ACI 318/2005, CEB-FIP MC/1990, EUROCODE 2/2004 e a NBR 6118:2003 previram com segurança as cargas de ruptura de todas as lajes. A base da armadura de cisalhamento tipo stud rails avançando dentro do pilar pode ter reduzido a carga de ruptura da Laje L3. A armadura de cisalhamento tipo stud rails apresenta maior facilidade de montagem e execução que a tipo double headed studs .

The diploma thesis is focused on design on loadbearing reinforced concrete structure of multi-storey apartment building with shops and offices on the ground floor and underground garage. The thesis consists of the analysis and design of ceiling slabs above underground floor, supporting columns and the beam under the underground floor ceiling slab. Calculation 3D model was created to determine internal forces. All structures are designed according to EC2, ČSN EN 1992-1-1. The thesis includes elaboration of static calculation, shape drawings, drawings of reinforcement of solved structures. The rest of the project part are not analysed.

The main purpose of thesis is a static solution of load bearing reinforced concrete structure of flat house. The work contains an assessment of waterproof concrete building. The object is built under the groundwater level. Supporting structures are concrete slab, walls and columns. An assessment of these structures is realized in terms of first critical state- carrying capacity and second limit state- limitation of crack widths.