Tensile strength of the pipe material determination according to the ultimate tensile strength

Abstract

Abstract A new calculation method for the strength of concrete pipes, developed, helps to determine the stresses in the walls of concrete pipes under the combined action of an external (compressing pipe) load and internal pressure from the fluid transported under pressure. An analysis of the nature and magnitude of the stresses is necessary to choose the material of the pipe walls, as well as to establish a possible combination of ultimate external. New formulas make it possible to determine the stresses in the pipe walls under the combined action of an external load and internal pressure. Based on the developed formulas, it was found that the main dangerous stresses in the pipes are tensile stresses. Using the obtained equations allows to determine the range of application of pipes made of modified concrete and to select the necessary concrete strength based on operational loads. There are two methods for determining the bearing capacity of pipeline: three-edge bearing method, in which the maximum breaking load (ultimate), and hydro-static loading method to determine the maximum internal pressure. The design of the test bench for pipes was developed in order to determine the maximum internal pressure on the pipe walls.