STRENGTHENED WOODEN DOUBLE-T IN A LOW-HEIGHT BUILDING

Abstract

 Prefabricated wooden housing with the use of wooden double-T beams made of 
wooden glued laminated lumber and ОSВ board (oriental strand board) - a new technology that is 
developing very fast today. High mechanical strength and resistance to external influences 
(including moisture) allows using OSB in any area of activities. Traditionally, when using such 
beams in the overlappings, a simplified beam framing is used, which is associated with limited 
bearing capacity and the pitch of beams within 400-500 mm. For the possibility of using beams as 
part of a normal beam framing, it is proposed to reinforce the beams with double-sided steel sheet 
linings on the screws in places of maximum effort and to adhere to other beams. To analyze the 
stress-strain state of the double-T beam in the software complex "LIRA-SAPR" a spatial computer 
model was developed. The stress-strain state of the beam was analyzed by displacement and stress 
fields, as well as by deformations of the structure. At the 1st stage, the double-T beam was 
calculated without steel plates reinforcing. At the 2nd stage with plates in the index zone, at the 3rd 
stage - with plates in the index zone and in the middle of the span. Analysis of pressure distribution 
in beam elements along the length and intersection of a component of a double-T beam has shown 
the effectiveness of a structural solution of glued wooden double-T beams reinforced with steel 
plates for low-height construction. The reinforcement of beams with steel plates in the span, with 
the formation of a box section, will allow realizing the beam framing of the normal type with the 
connection of beams in one level. Strengthening of beams with steel plates with the formation of 
box sections, in areas of maximum effort, increases their rigidity and spatial stability of the beam 
framing.