STRESS-STRAIN STATE OF REINFORCED CONCRETE PIPES UNDER THE INFLUENCE OF CLIMATIC TEMPERATURE CHANGES IN THE ENVIRONMENT

Abstract

The research analysis on determining temperature fields, stresses and deformations of transport structures under the influence of variable climatic temperature changes in the environment is carried out. It is established that climatic temperature changes in the environment cause the occurrence of temperature stresses and deformations of transport structures. The main damages and defects of reinforced concrete pipes in operation are given. It is established that one of the causes of defects and damages to reinforced concrete pipes is the level of temperature stresses and deformations that occur in the contact of a metal structure with a reinforced concrete pipe due to the action of variable temperatures caused by climatic temperature changes in the environment. A finite element model is developed for estimating the temperature fields and stresses of reinforced concrete pipes reinforced with metal corrugated structures, taking into account the action of variable climatic temperatures of the environment. The distribution of temperature fields in the transverse and longitudinal directions of reinforced concrete pipe under the action of positive ambient temperatures is calculated. It is established that the temperature field will be unevenly distributed over the pipe surface. In the transverse direction of the pipe, a temperature difference of +10° C was recorded between the reinforced concrete and metal shells. The calculation of temperature stresses and deformations of the pipe under the action of positive ambient temperatures is performed. It is established that the maximum value of normal stresses occurs at the contact of a metal pipe with a reinforced concrete one. At the same time, the value of temperature stresses in the transverse direction of the pipe is 321.61 kPa, in the longitudinal direction it is 321.61 kPa and in the vertical direction, it is 253.84 kPa. It is established that improving the theory and practice of determining the impact of climatic temperature changes on reinforced concrete pipes in the future will allow using appropriate materials and methods to strengthen these structures that meet the real conditions of pipe in operation, which will cause an increase in the service life of these structures in operation.