Experimentella och teoretiska uträkningar för skruv- och bäddhållfasthet för takinfästningar mot stålstomme
Lättelement located in Örnskoldsvik AB is one of Sweden's leading companies in the development of building elements in the form of roofs, walls and floors made ??out of light beams. The company has clients from Lund to Kiruna, and from Norway. This means that the elements have high standards when they have to take many different loads from wind and snow due to such wide geographic variation.The roof elements are structured so that the main body is made of light beams with an I?profile. On the underside of the light beams act as thin sheet metal nailed and glued to take up the tensile forces that can arise in the construction, the sheet metals also diffusion barriers. On top of the light beams are sheet plywood nailed and glued in order to take up all the pressure forces generated in the structure.The roof elements attachment is dependent on the slope of the elements, the design of the roof and the type of frame that will be attached to. In this thesis has one of the company attachments against steel frame been closely examined and evaluated. Experimental tests have been performed where the shear force in the screw and bed strength have been investigated. This is to ensure collaboration and capacity at different thicknesses of wood. Subsequently, theoretical calculations according to Eurocode 5 have been performed to compare them against experimental.The results of the experimental and theoretical comparison was that all the attachments could withstand on average 1000 N more in the experiments than in theory. This is of course a good result for the company Lättelement AB.