Abstract
Peculiar features of engineering and numerical calculations of wooden beams reinforced with polymeric composites with the local modification of the wood compression area under an insufficient volume of the initial data have been considered in this article. A technique for determining the physical and mechanical properties of materials and a stress-deformation diagram based on experimental investigation has been described. The enlarged algorithm of engineering calculation on the enumerated geometrical characteristics and numerical calculation by the consecutive loading technique and with correcting of the tangent modulus of elasticity at each step instantiated in PC Lira 10.6 has been presented. Analysis of the stress-strain state of wood-composite beams with local modification of wood has been made. Comparative analysis of engineering and numerical calculations has been performed within the limits of the calculated load. Conclusions on the results of theoretical investigations of the proposed beam construction have been formulated and compared with the existing investigations in the field of reinforcement of beam constructions with polymeric composites.
Highlights
Wood is one of the oldest and widely distributed structural material
Canvases and fabrics on the polymeric matrix [5,6,7,8], lamella [9,10,11,12,13] and laminates [14,15,16] installed in the tension area of the beam constructions are used as strengthening elements
To determine the actual physical and mechanical characteristics of the modified wood and polymeric composite, standard samples have been tested in accordance with GOST 21523.8-93, GOST 16483.10-73 and GOST 11262-2017 respectively
Summary
Wood is one of the oldest and widely distributed structural material. Combination of high strength, low unit weight, simplicity of processing, a rich forest raw material base of our country allows wood to compete with other traditional materials such as steel and reinforced concrete and even outstrips them by some characteristics such as resistance to chemically aggressive environment, radio transparency, perception of seismic and dynamic loads. Canvases and fabrics on the polymeric matrix [5,6,7,8], lamella [9,10,11,12,13] and laminates [14,15,16] installed in the tension area of the beam constructions are used as strengthening elements The effectiveness of such design solutions can be improved by the local modification of the wood compression area by impregnating the polymeric composition provided that the shearing strength of the element in the region of disrupture of the composite material and on the structural supports is ensured [17,18]. The purpose of the research is to investigate the stress-strain state of wooden beams reinforced with a unidirectional carbon tape on a tension area span part and the local modification of wood in the compression area on the basis of the results of the engineering calculation and numerical simulation in the “Lira 10.6” software package
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