Kompozitinių medienos-betono sijų ir jungių kūrimas ir bandymai

Abstract

Recently more and more buildings of light structures have been built in Lithuania as well as in other European and world countries. Nevertheless, timber products are not widely used for floors in this share of construction market. Traditional light timber frame floors are characterized by vibrations, acoustic transmission and low fire resistance. The above-mentioned problems can be rationally solved by using timber-concrete composite (hereinafter TCC) floors. In comparison with entirely timber floors such type of floors are characterised not only by increased strength and stiffness but also by increased fire resistance and better sound insulation. In comparison with reinforced concrete floors manufactured of non-regenerative sources TCC floors are lighter and more economic. These characteristics stimulate usage of TCC floors in newly built buildings. It should also be noted that usage of timber in building structures instead of concrete or steel could substantially decrease energy demand and emission of carbon dioxide during production. In this work author presents TCC structural solution when thin-webbed beams (I-joists) used for timber floor beams instead of solid or glued rectangular beams. Thin-webbed beams are without upper flange of structural timber. Embedding in concrete a part of web of oriented strand board (hereinafter OSB) connects the OSB web and the concrete slab. This concept allows to save structural materials and production costs. Nevertheless, not so many researches in the world were made on the behaviour on such type of composite structures, both the new proposed TCC beams and the groove and tongue connection between concrete and OSB web as the main components of TCC. Therefore both theoretical and experimental investigations were introduced into the programme and they were carried out for analysis of the behaviour of the new proposed type of TCC beams and their joints as well as for development of design methods remains relevant.