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The construction of buildings with free-form concrete surfaces can be accompanied with relatively high costs due to the production of uniquely shaped curved concrete elements. Delft University of Technology researches a method to produce such elements in a cost-efficient way using a re-usable flexible mould. The method requires a flexible reinforcement type for the production of the concrete elements. In this Master’s thesis one of the options to reinforce elements produced with the flexible mould was researched: textiles. In the first part of this project experiments were conducted on the behavior of (ar-glass) textile reinforced concrete in the flexible mould and the mechanical properties of textile reinforced concrete. Additionally the load bearing behavior of textile reinforced concrete was modeled using the finite element method ...
The construction of free form building stagnated, due to the high construction cost of it. Double curved surfaces are only applied at projects with a high profile and projects above average budget during years. The problem with double curved surfaces is mainly the formwork. The present days used techniques to construct these formworks are statically. For example: wooden, steel or milled EPS formwork could only be used for one shaped elements. The lack of repetition and so the reusability of the formwork, which means that for a free form surface for every element a unique formwork is needed, makes the construction very expensive. A feasible way for mass production of unique shaped double curved elements could be achieved by a flexible formwork: a formwork that can be adjusted in every desired shape. It consists of a flexible layer tha...
The Fifties and Sixties of the previous century were the golden era of thin concrete shell roofs. Two characteristics that made these thin shells very popular are the strength, and the architectural exciting forms. After this golden era the construction of these thin concrete shells has stagnated. Reasons for this stagnation could be found in the difficulties that had to be encountered in the realization of these structures. One of the attempts to make shells more often build is with the prefabrication of the shell. But not many free form shell structures in prefabricated concrete have been build. One of the reasons for this is that the design and production process of free formed shells in prefabricated concrete is not efficient enough to make the construction of these shells feasible in most cases.
The precast concrete sector is growing and to continue this growth it is necessary that new innovations, ideas, technologies etc. are developed to improve the functionality of precast concrete structures. Many applications can be found nowadays for all different kinds of precast concrete elements. One such application for example is precast concrete shear walls. These walls may consist of elements of different shapes and sizes and are connected at a joint. The joints are important for the structural functionality and have a large influence on the costs of the structure. The joints are often the biggest drawback. To tackle this, many different technologies and methods have been and are being developed to improve the functionality of the joint, while taking the costs into account. One such method is the application of steel fibre reinfor...
The development of self-compacting concrete (SCC) marks an important milestone in improving the product quality and efficiency of the building industry. SCC homogenously spreads due to its own weight, without any additional compaction energy and does not entrap air. SCC improves the efficiency at the construction sites, enhances the working conditions and the quality and the appearance of concrete. Fibres bridge cracks and retard their propagation. They contribute to an increased energy absorption compared with plain concrete. Self-compacting fibre reinforced concrete (SCFRC) combines the benefits of SCC in the fresh state and shows an improved performance in the hardened state compared with conventional concrete due to the addition of the fibres. Due to its special characteristics new fields of application can be explored. This thesis...
The report contains a research on UHCP and the theory of thin shell structures. The combination of these aspects is used for a complete structural design for a dome structure with a span of 150m. The conclusion and recommendations which where found were then applied for a preliminary design for 'Fiere Terp', a architectural design for a sports-dome in Leeuwarden.
Objective The recently developed material ultra-high performance concrete (UHPC) has compressive strengths of over 150 MPa and a ductile behaviour. It has a higher stiffness and superior durability characteristics in comparison with ordinary concrete. The opportunity emerges to find new optimal structural topologies for this material. The ant system is the first of a family of algorithms that are nowadays all referred to with the term ant colony optimisation (ACO). It is a computational algorithm that is able to solve combinatorial optimisation problems. Its optimisation process is based on the foraging behaviour of ants. ACO is not widely explored for structural design cases. In the city of Apeldoorn a new sports centre called Omnisport is under construction. The centre consists of several halls, one of them containing a cycling and...
The development of self-compacting concrete (SCC) was an important step towards efficiency at building sites, rationally producing prefabricated concrete elements, better working conditions and improved quality and appearance of concrete structures. By adding fibres to SCC bar reinforcement can be replaced and the performance of concrete structures enhanced. Self-compacting fibre reinforced concrete (SCFRC) combines the benefits of SCC in the fresh state and an enhanced performance of fibre reinforced concrete in the hardened state. With the special characteristics of SCFRC new fields of application can be explored. This paper describes results of a PhD-study [Grünewald, 2004], which was carried out at the Delft University of Technology. The effect of steel fibres on the characteristics of SCC in the fresh and the hardened state are di...
The project 'self-compacting fibre-reinforced concrete (SCFRC)' is part of the Dutch STW/PPM program - 'cement-bonded materials' - DCT.4010. Subproject III to which the project ,SCFRC' belongs deals with the development of new high performance concretes. The project 'SCFRC' aims at investigating the effect of type and content of fibres on the characteristics of self-compacting concrete in order to optimise the mixture composition. Fibres are able to bridge cracks and to improve the ductility of otherwise brittle cementitious materials. Therefore, the addition of fibres might extend the possible fields of application of self-compacting concrete. Besides the properties in the fresh state, while the concrete still flows, the mechanical behaviour will be investigated. This paper aims at introducing the reader to the goals, methods of resea...
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