No abstract

Based on the analysis of approaches to reinforcing the brick masonry structures, the advantages of carbon fiber as a reinforcing component are presented. Methods for calculating brick structures reinforced with carbon fiber under central and eccentric compression are proposed. These methods allow determining the longitudinal force taking into account the calculated compressive resistance of the masonry, the masonry working conditions and the influence of long-term load, as well as the coefficient of the masonry surface reinforcement at the reinforced wall. The schemes of strengthening the wall with vertical canvases and at the same time vertical and horizontal carbon fiber canvases are considered. Depending on the direction of the eccentricity of the load application, methods for calculating the strength of reinforced masonry under the action of a moment in the masonry plane and from the wall are developed. The ultimate deformations of carbon fiber are estimated taking into account possible options for the destruction of masonry reinforcing elements.

The publication is devoted to the study of the work of monolithic reinforced concrete floor with shaped steel profiles in two directions. Theoretical and experimental studies on models of the plate were made. To evaluate the stress-strain state of the slab reinforced with profiled flooring during operation, under the action of a uniformly distributed load, the theory of structurally orthotropic slabs supported along the contour was used. A technique has been developed for determining the bearing capacity of a slab based on the method of limiting equilibrium. The field of application of the developed methodology for calculating square and quasiquadratic monolithic plates with steel profiled flooring is substantiated. Putting into practice the construction of these floors, designed taking into account their work in two directions, can reduce the consumption of steel (steel beams) up to 50%, concrete up to 8% and labor at the construction site up to 22% per 100 m2 of the covered area compared to the calculation of the proposed structures according to the beam scheme. These structures are recommended for use in coatings and ceilings during the reconstruction of buildings, as well as in new construction.