This diploma thesis deals with long span load bearing roof systems made of wooden elements. The first part explains the general characteristics of wood. It also describes the mechanical properties and presents their relation to wood type and the direction of loading by means of informational values. This part continues with the presentation of most commonly used fasteners as well as all required elements for proving the load-bearing capacity and specific features of glued laminated timber (glulam).\ud
The second part concentrates on glued laminated timber and describes its production and advantages and weaknesses in comparison to solid wood. It concentrates on particularities that are not connected to the use of solid wood. It analyizes the behaviour of these elements, the types of failure and the characteristics that lead to failure. Modelling of glued laminated elements is analyzed and the models for manual and computer analysis are shown that are continuously perfected. The next theme of this chapter are glues, the choice of which, besides the choice of wood, is of vital importance in the production of glued laminated trusses. The specificities of roof bows are shown, where the influence of the choice of statics system and longitudinal connections on the global stability of the construction is determined.\ud
The third part presents wooden trusses and different forms of roof constructions in relation to the greatest possible span, allowed by each construction. The analysis of most commonly used elements for connecting wooden parts of a truss is made. The development of models of trusses and their optimisation leads to the conclusion that deformations in the truss often result from movements at joints. The diploma thesisr presents other possibilities of using composite construction timber that is not glued laminated timber (glulam), with the intention of increasing the span of wooden load-bearing structures of roofs.\ud
Some examples of wooden load-bearing structures of roofs are presented and the diploma thesis notes that greatest spans are achieved both by trusses and by glued laminated timber, a combination of both or by other composite structures.\u
