Vybrané problémy dřevěných lávek z hlediska prostorové tuhosti a použitelnosti

Abstract

The dissertation deals with selected problems of timber foot bridges that load these structures during their life cycle. These are, in particular, problems connected with gradual changes in spatial stiffness and usability. The change in the spatial stiffness of the structure as a whole, and also in the joints, is caused during its lifetime by combining the effects of load and moisture in the progressive degradation of wood. These influences together bring about a change in the state of the structure even from the usability point of view, where the change of rigidity of the structure as a whole results in increasing the deformation and creating a greater tendency for the structure to oscillate. The proposal is to analyze the behavior of selected real constructions of timber foot bridges in experimental in situ measurements including the preparation of their numerical models, which serve to compare measured and theoretically determined quantities. On one realistic timber foot walkway, the task is to make a proposal for eventual correction of the attenuation of the structure in the form of a theoretical design of the oscillation damping, and to verify the efficiency of the design in comparison with the experimentally designed tunned mass damper.