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The Ultra-high performance concrete (UHPC)-timber-composite offers the possibility to create completely new, slim bearing structures. The shear forces in the joint are continually transferred by the holohedral adhesion of timber and concrete. Thus, a “quasi fixed” joint can be created.
Constructions with a high bearing capacity but little dead load are possible. These characteristics comply with the requirements of sustainability regarding an economical and ecological material consumption.
The results of the first methodical analyses concerning the influence of the cohesiveness and the surface configuration of the joint partner timber and concrete confirmed basically the suitability of an adhesion bond for this construction principle. The phenomena observed could be explained fracture mechanically. The realizability in practical application was proved by two experiments with construction elements.
The knowledge of the influence of long-term effects is completely fragmentary. This concerns both deterioration effects of the adhesive and mechanical exposure by different shrinking and swelling behaviour to be expected in a timber-concrete-composite as well as different temperature expansions of the materials involved. This phenomenon is vital for the building constructions that, in many cases, are exposed to the changing temperature and humidity conditions depending on the season and the time of the day.
In the context of the current research project, realistic thermal-hygric basic conditions are to be developed, internal stress (chemical, thermal, hygric) to be determined in the joint and to be heterodyned with deterioration effects.
The basic principles for the design as well as for the construction technology were developed in “Development of hybrid construction elements of timber and ultra-high performance concrete” (published in kassel university press).
Coordination: Internationaler Verein für technische Holzfragen (iVTH), Braunschweig
Promotion by Arbeitsgemeinschaft industrieller Forschungsvereinigungen e.V. (AiF)