Strengthening of the operated wooden floor beams with external rigid reinforcement
Михаил Лукин, Светлана Рощина, E.A. Smirnov, Mei Shunqi
Abstract
Abstract Reinforced wooden floor beams with rigid reinforcement were studied from a rolling channel fixed to the body of the beam by means of obliquely glued reinforcing rods. The experimental study of four variants of reinforced solid-wood beams was performed on a unique stationary stand using an eight-point loading scheme that simulates a load evenly distributed over the beam span. When reinforcing beams by the proposed method, the load-bearing capacity increases by 47 … 66%, and the deformability decreases by 54…62%, depending on the location of the rigid reinforcement (top or bottom of the beam) and the inclination of the glued rods (according to the main compressive or tensile stresses). When the reinforcement elements are placed on top of the beams, their load-bearing capacity is on average 18% higher than at the bottom. It is experimentally proved that the destruction of reinforced beams is fragile, which in turn excludes the possibility of their collapse from chipping and splitting in the supporting sections. Research has proved the high efficiency of using the developed method of reinforcement during major repairs and strengthening of buildings in use.