Calculation Method Analysis for Structure Strengthening with External Reinforcement

Abstract

This article describes the main provisions of the calculating method for the gain of reinforced concrete structures by the system of external reinforcement. As an example, the calculation of monolithic reinforced concrete slab with carbon fiber material using the SCAD Office software package was considered and analyzed, which most accurately reflects the geometry and physico-mechanical parameters of the structure. The calculation of reinforced concrete structures includes engineering survey to determine the existing physic-mechanical characteristics of materials, perform calibration calculations and stress calculations in reinforced concrete structures of buildings and structures, taking into account the existing stiffness characteristics, designing reinforcement engineering solutions, the calculation of the forces in the structures and verification of the structures bearing capacity after the reinforcement is completed. During the survey of reinforced concrete structures, it is determined existing loads, deformations, deflections, physico-mechanical characteristics for the subsequent selection of the composite material cross section and taking them into account after the concrete structure’s reinforcement. The external reinforcement systems is used for reinforcing concrete structures and rely on tensile stress perception, taking into account the joint deformations of the composite material used for reinforcement and the concrete structure. The calculation of reinforced concrete structures carried out on the first and second limit state. If the load after reinforcement with a composite material does not increase compared with the loads at the stage of the reinforced concrete structure operation, the calculation for the second group of limit states is not performed. The reinforced concrete structures calculation using an external reinforcement system made of composite materials is carried out from the joint operation conditions of the installed external reinforcement and the concrete base before the limit state onset. The calculation is performed in two stages: at the first stage, the reinforced concrete structure is calculated without reinforcement taking into account the existing loads and deformations, at the second stage, after the work on reinforcement, the design is calculated taking into account the efforts and deformations in the first stage.