Strength and stability of composite concrete and pipe-concrete structures under static load

The existing regulatory framework and imperfect calculation methods hinder the widespread use of pipe-concrete structures, which have great potential for industrial and civil facilities requiring small cross-sections of load-bearing elements. In order to solve this problem, a series of experiments is conducted to study the behavior of various combinations of steel and concrete materials under static load. Stress-strain state of composite and pipeconcrete structures is investigated. The analysis is given to the bearing capacity of test specimens. The critical load of specimen fracture is calculated, the bearing capacity loss and fracture are determined, deformation diagrams are suggested herein. The comparative analysis of bearing capacity of test specimens is conducted.The analysis of experimental investigations shows the non-linear increase of bearing capacity during the joint operation of steel shell and reinforced concrete core of the pipe-concrete element, and advantages of pipe-concrete structures over conventional structures.