Determining the Ultimate Pressure on a Thick-Walled Pipe Internally Reinforced with a Metal Pipe

Abstract

Determining the Ultimate Pressure on a Thick-Walled Pipe Internally Reinforced with a Metal Pipe

Evdokimov E.E., Arzamaskova L.M., Konovalov O.V., Klimenko V.I.

Incoming article date: 15.11.2025

The problem of the ultimate external pressure on a thick-walled concrete pipe internally reinforced with a metal pipe is considered. The pipe material is assumed to be ductile, not hardening under small deformations. The problem is solved under the assumption of plane strain. The stress state in the concrete mass and along the contact surface between the metal pipe and the concrete is investigated, assuming the concrete is in the ultimate limit state. A law for the change in the stress state in the concrete mass and a transcendental equation for determining the ultimate pressure on the outer surface of the concrete shell are derived. The ultimate uniformly distributed load acting on the outer surface of the concrete shell, within which the metal pipe is placed, is determined.

Keywords: concrete deformability, strength criterion, ultimate limit state, stress state in the concrete mass, ultimate pressure