Modeling of changes in the strength parameters of the monolithic bond of layers in three-layer reinforced concrete structures under operational influences

In industrial housing construction, the improvement of enclosing structures is aimed at improving their operational characteristics in order to create a durable shell of buildings that requires the least cost of repairs and creates comfortable conditions for people to live. To ensure high thermal protection characteristics of buildings, three-layer structures made of materials with various physical and mechanical characteristics of layers and ways of connecting them to each other, ensuring their joint work, have been widely used. One of such methods is the creation of a monolithic-bonded cement matrix, which during operation changes its strength and deformation characteristics and affects the stress-strain state of a multilayer reinforced concrete structure as a whole. Temperature fluctuations were carried out under simulated conditions of exposure from different sides of the tested structure when testing models of multilayer enclosing structures of monolithic cross-section, the strength parameters of the concrete of the middle layer and the contact zone of the layers were compared, as a result of which a decrease in the strength of the layers after exposure was established, not exceeding regulatory requirements.