THE PROPERTIES SYNERGY OF STEEL AND WOOD IN THE CONSTRUCTIONS OF METAL-AND-TIMBER I-BEAMS WITH A CORRUGATED WALL

In modern bearing structures of frame widely used thin-wall steel profiles and constructions from glued timber. Each of these materials has its own advantages and disadvantages in the issues of bearing capacity, rigidity, heat engineering and other physical characteristics. For further improvement of the efficiency of bearing frame buildings it is expedient to consider possibility of combination of positive properties of timber and metal due to their optimal constructive combination. 
The purpose of the research is to determine the effectiveness and expediency of using metal-and-timber I-beam profiles in the construction of building frames. The uniqueness of this construction lies in to synthesize the properties of corrugated metal wall, which is well perceived transverse forces in beams, and belts from mass or glued timber, which are able to perceive significant normal stress along fibers and at the expense of the intensity contribute to the guarantee of bending-steep stability of beams. 
For a reliable combination of steel profiled sheet and timber belts it is possible to use mechanical suppression of rigid corrugated steel wall in timber belts, or connection with two-component epoxy adhesive, which has good adhesion both with metal and timber surfaces. As a result of the use of metal profiled walls in timber double-walled beams there is an increase in bearing capacity, rigidity of profile, the necessary height of cut and own weight of beams is reduced. All this significantly increases the range of use of double-branch beams with belts from timber and increases their efficiency. 
To ensure high corrosion resistance, a galvanized metal sheet is used. Due to the use of timber and thin corrugated wall, the own weight of combined beams is 2-3 times less than the same metal and solid timber beams of rectangular cut, which reduces the cost of building construction. Application of combined metal-and-timber beams is a promising direction of further increase of efficiency of constructions of bearing frame of buildings, combining positive properties of two materials.