Composite materials for strengthening of load-bearing wooden structures in historical buildings

Abstract

The results of tests of a composite material made on the basis of glass cloth and an epoxy binder in the form of ED-20 resin are considered in the article. The main strength and elastic characteristics of the composite are obtained experimentally, including taking into account the set of strength of the epoxy matrix in time. It is shown that for the proposed composite material, a set of strengths for all main types of stress state up to the level of 70% of the calculated value occurs on average for 16 days, to a level of 90% of the calculated one for 45 days, 95% of the calculated value for 60 days from the beginning Curing the composite on the surface of the structure. Statistical analysis of the strength and deformability parameters of the composite material, comparison of the strength of the composite material and wood at different reliability levels for the main types of stressed state of wooden elements in building structures are given. The results of numerical strength analysis in the ABAQUS program complex of the state of stress of a compound at different thicknesses of a composite material are presented.