Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of prefabricated timber-concrete composite floors
Timber-concrete composite structures were originally developed for bridges and upgrading of existing timber floors, but finds today new applications in multi-storey buildings. Most of the research performed to date has been focused on systems where "wet" concrete is cast on top of timber beams with mounted connectors. A novel composite system where the concrete slab is prefabricated off-site with the connectors embedded and then connected on-site to the timber joists is presented in this thesis.A notable benefit of prefabricating the concrete slab is that most of the concrete shrinkage will develop when the slab is not yet connected to the timber beam, markedly reducing the correlated increase in deflection and flexural stresses in the composite beam. Another advantage of the prefabrication is the reduction in construction cost by moving work from the building site to the workshop. In this research special attention has been paid to develop and use connection systems easy to produce and mount in order to speed up the construction process.Different types of shear connectors suitable for prefabrication were investigated; coach screws (alone or combined with a timber joist notch), metal plates (glued or nailed), dowels, and toothed metal plates embedded in the concrete slab. The experimental test programme includes: (i) direct shear tests to failure of 7 different connection systems, (ii) full-scale bending tests to failure followed by a numerical analysis, (iii) long-term tests under sustained load of full-scale composite beams and a following numerical analysis. The outcomes of the experimental tests show that it is possible to achieve good structural performance with a prefabricated system, particularly using the connection with coach screws and timber notches. The mechanical properties of the prefabricated connections can be used in the design method in Eurocode 5.The experimental-numerical investigations indicate that the new shear connections are suitable for prefabricated timber-concrete composite structures ...
Development of prefabricated timber-concrete composite floors
Timber-concrete composite structures were originally developed for bridges and upgrading of existing timber floors, but finds today new applications in multi-storey buildings. Most of the research performed to date has been focused on systems where "wet" concrete is cast on top of timber beams with mounted connectors. A novel composite system where the concrete slab is prefabricated off-site with the connectors embedded and then connected on-site to the timber joists is presented in this thesis.A notable benefit of prefabricating the concrete slab is that most of the concrete shrinkage will develop when the slab is not yet connected to the timber beam, markedly reducing the correlated increase in deflection and flexural stresses in the composite beam. Another advantage of the prefabrication is the reduction in construction cost by moving work from the building site to the workshop. In this research special attention has been paid to develop and use connection systems easy to produce and mount in order to speed up the construction process.Different types of shear connectors suitable for prefabrication were investigated; coach screws (alone or combined with a timber joist notch), metal plates (glued or nailed), dowels, and toothed metal plates embedded in the concrete slab. The experimental test programme includes: (i) direct shear tests to failure of 7 different connection systems, (ii) full-scale bending tests to failure followed by a numerical analysis, (iii) long-term tests under sustained load of full-scale composite beams and a following numerical analysis. The outcomes of the experimental tests show that it is possible to achieve good structural performance with a prefabricated system, particularly using the connection with coach screws and timber notches. The mechanical properties of the prefabricated connections can be used in the design method in Eurocode 5.The experimental-numerical investigations indicate that the new shear connections are suitable for prefabricated timber-concrete composite structures ...
Development of prefabricated timber-concrete composite floors
Lukaszewska, Elzbieta (Autor:in)
01.01.2009
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, 1402-1544
Hochschulschrift
Elektronische Ressource
Englisch
Development of Prefabricated Timber-Concrete Composite Floors
| Springer Verlag | 2014
Performance of connections for prefabricated timber–concrete composite floors
| British Library Online Contents | 2008
Performance of connections for prefabricated timber–concrete composite floors
| Online Contents | 2008
Performance of connections for prefabricated timber–concrete composite floors
| Online Contents | 2008
Performance of connections for prefabricated timber–concrete composite floors
| Springer Verlag | 2008