EVALUATING THE EFFECTIVENESS OF TECHNICAL SOLUTIONS FOR REINFORCING CONCRETE STRUCTURES WITH COMPOSITE MATERIALS

Abstract

In recent years, the problems of ensuring the durability and operational reliability of structures have attracted the attention of many experts, and calculations of structures for durability are becoming the norm in many countries of the world. In industrialized countries, more than 40% of all investment in the construction industry is used for maintenance and repair of reinforced concrete structures. At the end of the last century, in the United States, more than $ 20 billion a year was required to repair bridges made of reinforced concrete, and according to calculations, these costs have increased by more than $ 0.5 billion annually. In the UK, more than $ 1 billion is spent annually on repairs of such structures, and there is a tendency to increase operating costs. In Russia, the funds spent on the repair and restoration of individual industrial structures for 4-5 years have reached an amount equal to their total cost. Examination of the experience of operating engineering structures made of concrete and reinforced concrete shows that they are destroyed much earlier than should be according to the design standard period due to accelerated physical wear. The costs of repair and restoration of structures are significantly higher than planned, and the timing of their implementation, the volume and content of work are assigned without taking into account the current and future state of the structural elements. Repair and restoration of the reinforced concrete structures currently, unfortunately, do not have a coherent and deep scientific basis to assess their effectiveness. Today, according to experts, the condition of most repaired structures made of reinforced concrete is noticeably deteriorating several years after they have been repaired. According to research, about 75% of failures in the repair of the reinforced concrete structures will occur in 5 years of operation only. It is considered to be a success if repeated repairs must be performed in 12-15 years, and in the ideal case, such work must be repeated in 25 years. The punctuality of the work is due to significant amounts of work on the reconstruction, repair and strengthening of buildings and structures, including historical monuments and architectural monuments, and the resulting problem of rational and reliable design of strengthening structures using composite materials based on carbon and glass fibers. The purpose of this work is to examine the parameters and indicators for evaluating the effectiveness of technical solutions for reinforcing the concrete structures with composite materials. Examination and determination of the requirements of normative and technical documentation for composite materials, formation of criteria for evaluating the effectiveness of the reinforced concrete structures with composite materials, determination of significance coefficients for criteria for evaluating the effectiveness of reinforced concrete structures with composite materials.