Experimental Study of Longitudinal and Transverse Bending of Pipe Concrete Rods

Abstract

The results of experimental studies of pipe-concrete rods during longitudinal and transverse bending tests, since these stress-strain states are of interest from the point of view of the operation of building structures, are presented. To carry out the experiments, several series of laboratory samples 700 mm long were made, which were steel pipes with a monolithic core made of fine-grained concrete. Diagrams of test installations are presented and methods for conducting experiments on axial compression with subsequent loss of stability and three-point bending with concentrated lateral load are described. Based on experimental data, deformation diagrams are constructed and compared with the deformation of a hollow steel pipe. It is noted that the presence of a concrete rod prevents premature loss of stability of the pipe wall during longitudinal bending, limits local deformations due to the curvature of sections during transverse bending, increases the elastic region of deformations, and also prevents the brittle nature of destruction, which is an important advantage in the design of buildings.