Abstract

The object of research is the residual resource of the structures of buildings and structures after various influences. The residual resource is the total operating time of the object from the moment of monitoring its technical condition to the transition to the limit state.The calculation methods recommended by the current regulatory documents of Ukraine do not allow predicting the probability of failures, an increase in the number of structural defects and deformations over time and really assessing the possibility of further operation in such conditions. One of the most problematic places is determination of the technical condition of structures of buildings and structures operating under various influences (in an aggressive environment, with forced displacements of supports, possible high-temperature influences, etc.).It is shown that the residual life of the structures of buildings and structures that suffered damage during operation after various influences can be reassigned due to reinforcement. In this case, the main question remains the determination of the physical and mechanical characteristics of the materials that were used in the manufacture of structures, as well as the calculation of structures for the justified purpose of the cross sections of reinforcing elements. Characteristics of materials are determined during the observation. During the observation, various methods were used to determine the physical and mechanical characteristics of structural materials (concrete, reinforcement, steel, brickwork, etc.), which are usually non-destructive. Non-destructive methods can be applied in cases where this is possible under the conditions of operation of structures, for example, the removal of fragments of metal, reinforcement or concrete from lightly loaded elements.The possibility of reassigning the residual resource is determined by comparing the values of the bearing capacity of the structures with acting values. The bearing capacity of the structures is determined using the values of the characteristics of materials and parameters (cross-sectional dimensions, geometric dimensions taking into account corrosion wear, etc.), which were obtained during the observation. The magnitudes of the forces acting in the structures of buildings and structures are determined by modeling their work using the finite element method and modern computing systems. Thanks to this procedure, it is possible to obtain the efforts that could arise in the structures of the building and reinforcement. Thanks to this, it is possible to make a decision on the reassignment of the remaining life of the structures, that is, the possibility of further operation, the need for reinforcement or replacement.

Highlights

  • Together with new construction, more and more often there is a need to carry out work to restore the operational suitability of building structures of buildings and structures

  • It is necessary to resolve issues related to the determination of the stress-strain state (SSS) and the implementation of work to extend the life of structures

  • These works must be solved in a complex, that is, a fore­ cast of a possible extension of the life of structures of buildings and structures should be preceded by work related to the assessment of their technical condition

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Summary

Introduction

More and more often there is a need to carry out work to restore the operational suitability of building structures of buildings and structures. General monitoring of the technical condition of buildings and structures is a system of planned, continuous or periodic observations and control These activities are carried out according to a specially developed program for determining changes in the technical condition of buildings and structures and evaluating them in order to prevent the limiting values of controlled parameters. This term refers to the maximum (minimum) values of the monitored parameters used to configure the monitoring system and intended to assess changes in the state of load-bearing structures of an object [2]. The number and types of controlled parameters are determined by the results of a previous observation, the requirements of regulatory and design documentation, the conditions for maintaining the operational properties of an object during its life cycle. Based on the established signs, using the predicted change over time, criteria are established for the exhaustion of the bearing capacity of structures with the consequences of this type of failure, and the residual resource is determined

The aim and objectives of research
Research of existing solutions of the problem
Methods of research
Research results
SWOT analysis of research results
Conclusions
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