DETERMINATION OF THE STRESS-DEFORMED STATE OF BENDING WOODEN ELEMENT REINFORCED WITH COMPOSITE AND METAL

Abstract

Wood reinforcement significantly affects the load-bearing capacity and stiffness of the elements as a whole, while affecting the reliability of the elements. At the same time, metal rods were most often used for reinforcement. Metal rods when used in a composite with wood give a very good result, increasing the rigidity and strength of structures. And also has a positive effect on the redistribution of efforts in wood without accumulating large stresses in one place. This is due to the flexibility of the wood and the rigidity of the metal fittings themselves. Among the disadvantages of such structures is their high price. However, in the era of industrial development, there is a possibility of reducing this cost. Another disadvantage of the use of reinforcement is the presence of a yield point, therefore, for beams, reinforcement of higher grades should be used, where the yield point begins at high stress levels. One of the options for improvement and improvement of such an element is the use of composite reinforcement with the highest modulus of elasticity, namely carbon reinforcement, in the stretched zone. Carbon reinforcement is the closest in terms of modulus of elasticity to steel and can replace steel, while the absence of a yield point is a big plus. However, the carbon reinforcement itself has a variable modulus of elasticity due to the composite of resin and carbon fibers. Therefore, it is best to choose carbon reinforcement with the maximum possible modulus of elasticity for structures. Therefore, the basic prerequisites for reinforcing the wooden element with composite and metal materials have been established. Prerequisites for establishing the stress-strain state for wooden elements with compression and tension zone reinforcement are described. An algorithm for determining the "moment-curvature" graph using various functions is given.