ANALYSIS OF THE STRAIN-STRESS STATE OF THE BENDING CONTINUOUS RC-BEAMS WITH HYBRID REINFORCEMENT IN THE TENSILE ZONE UNDER INTERMEDIATE SUPPORT

Abstract

The article considers the proposed model describing the stress-strain state of bent statically indeterminate reinforced concrete beams with combined reinforcement (the joint arrangement of metal and composite rods) of the stretched zone of the central support section, based on the positions of the general deformation model of cross-sections with normal separation cracks between concrete subelements formed by two adjacent cracks and the block model of the resistance of the bent element. The prerequisites and assumptions for applying the proposed model are presented. The stress-strain state of the central reference section of the considered elements is analyzed according to the proposed model. The criterion of destruction of statically indeterminate reinforced concrete beams with hybrid reinforcement of the stretched zone of the central support section is revealed, which fully allows taking into account the redistribution of internal forces between the support and span sections of the element.