As part of the evaluation of fatigue tests for pulling screws out of cross laminated timber, numerical modelling of the tests is to be carried out. This requires precise characteristic values of the wood used. For this reason, so-called off-axis tensile tests, i.e. tensile tests on samples with different angles, are to be carried out. These can then be used to calculate the tensile, transverse tensile and shear strengths of the wood.
As part of the thesis, the students will first be involved in designing the experiments on the basis of a literature search. The experiments should then be carried out and analysed. Depending on whether the thesis is written as a student research project or a Master's thesis, the scope of the task will be adapted, for example, part of the modelling can also be part of the thesis as part of a Master's thesis.
Further information can be found in the following PDF (German).
Nailplate trusses (NP), such as those used for supermarket roofs, are very slender constructions. This lean and resource-saving construction method is one of the main reasons for the enormous cost-effectiveness of nail plate truss constructions. For production reasons, NP trusses are always flat bar structures, but in the building they become part of a spatial load-bearing structure that is subjected to additional stresses due to the spatial load transfer and stabilisation. In addition to the cross-sectional stiffnesses of the bar-shaped elements, the mean connection stiffnesses in the nodes (NP) are also of considerable importance for determining the longitudinal and shear forces as well as the bending moments.
To this end, the IBHolz is conducting a large-scale series of tests on a large number of nailplate connections, which represents an enormous effort in terms of experimental investigations. With the help of computer-aided modelling, basic node configurations are to be simulated as part of a student research project or master's thesis and verified with the results extracted from the tests.
Further information can be found in the following PDF (German).
Plaster systems are complex material mixtures consisting of sands, organic and mineral binders, a wide variety of aggregates, a fabric of glass fibres and acrylate adhesives and possibly paints. Despite the relatively low thickness of the plaster systems, large quantities are used every day - but they are also dismantled. The work is to deal with the recyclability of such plaster systems; practical tests are part of the work.
The specific content of the thesis can be adapted depending on the type of work (Bachelor's / student research project / Master's thesis). Due to a co-operation with the Fraunhofer WKI, there is the explicit possibility to carry out parts of the work in the technical centre / laboratory of the Fraunhofer WKI.
The construction industry needs new materials that release as few emissions as possible during production, consume as little energy as possible and are reusable.
In the *NAWARO experimental field, approaches for the realisation of components and/or component connections with (new) materials made from renewable raw materials can be designed and tested on small-scale demonstrators.
In the project workshop, students take a critical and active approach to materials based on renewable raw materials, including wood, bamboo, cork, mycelium and hemp lime, and look for ways to develop building applications in a circular construction industry.
Within the scope of the student research project, the focus should be set according to individual interests. The material and component can be analysed with regard to building physics, mechanical, structural and ecological usability.
Further information can be found in the following PDF (German).
In timber construction, rectangular solid cross-sections are used almost exclusively for a variety of reasons. The reasons for this are largely known and do not need to be explained separately. Instead, this paper will deal with the possibilities of manufacturing and using profiles analogous to metal profiles, but made of wood / wood-based materials. Hollow profiles / tubes are mentioned here as examples. The specific content of the thesis can be adapted depending on the type of work (Bachelor's / student research project / Master's thesis). Due to a co-operation with the Fraunhofer WKI, there is the explicit possibility to carry out parts of the work in the technical centre / laboratory of the Fraunhofer WKI.
The content of the work can therefore be partially or completely
The Institute of Building Construction and Timber Structures, together with the Institute of Building Materials, Solid Construction and Fire Protection and the Institute of Steel Construction, is pursuing the development of a new type of hybrid component made of steel profiles and high-performance timber cross-sections such as glulam and BauBuche. Hybrid components made of steel and wood make it possible to combine the advantageous properties of both materials in terms of load-bearing behaviour, fire resistance behaviour and resource efficiency. As a renewable raw material, wood has advantages in terms of resource efficiency and its low mass and heat-insulating function in the event of fire.
Within the framework of the research project, different questions are conceivable depending on personal interest, which can be investigated in depth as part of a student research project or Master's thesis.
Further information can be found in the following PDF (German).
The strength analysis and the associated quality assessment of timber components in existing buildings is an essential part of the structural assessment of the construction. The criteria for visual assessment (common practice) are based on the current standards of the woodworking industry, which often results in an underestimation of the strength of historically processed and installed timber components. The examination of components using ultrasonic measurement methods provides information about the stiffness of the components, which in some cases correlates strongly with the strength values. On the basis of the test results, components can therefore be assessed more precisely with regard to their quality and strength.
Theoretical principles of the measurement method and influencing parameters can be developed as part of a student project. The investigation of selected influences, such as the moisture content of the wood or the stress states in the component during the measurement, can be made possible by an experimental part of the work.
Further information can be found in the following PDF. (German)
The load-bearing and deformation behaviour of timber-concrete composite structures is largely determined by the characteristics of the composite materials used within the cross-section between the composite partners (timber and concrete). The force-deformation relationship of the connection proves to be a decisive indicator in this context and thus also represents the basis for the design of this construction method. As part of a student project or as a student assistant, the experimental tests are to be carried out on small-format test specimens and then analysed. The test procedure is to be defined and described using a standardised flow chart. The database obtained from the technical tests is to be analysed with the aid of a computer-aided follow-up calculation, which is to be developed as part of the activity, in order to be able to derive the design-relevant parameters.
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