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This article presents the results in the research of the load-carrying ability of reinforced-concrete nonpressure pipes with inner lining intended to protect concrete against corrosion. The lining (covers) are mounted as a stay-in-place formwork when manufacturing the pipes. The covers are made of 3-5 mm thick polyethylene sheets. To be fixed in the pipe wall concrete, the linings are provided with special anchoring elements. Two lining types are considered: 1 – with anchoring elements in the form of solid longitudinal ribs; 2 – with anchoring elements distributed equidistantly over the shell surface (≈400 pcs/m2).The research has been performed by numerical simulation using a three-dimentional finite element model. The load was applied according to a three-linear pattern used to test pipes for strength (including that specified in ЕN 1916). The computation was performed by the iteration method taking into account physical non-linearity of concrete. The computation makes allowance for formation and opening of cracks in the longitudinal pipe wall sections. The examples of computation of a pipe with the diameter of 2,000 mm and wall thickness of 150 mm reinforced with two cylindrical cages and a pipe with the diameter of 1,000 mm and wall thickness of 110 mm reinforced with a single cylindrical cage are given.It has been determined that the load-carrying ability of pipes with type 1 protective linings is lower than that of pipes with type 2 linings. Maximum (up to 25%) reduction of the load-carrying ability is observed in pipes reinforced with a single cylindrical cage. In pipes of this type, cracks are formed at lower loads.The load-carrying ability of pipes is reduced due to entering of anchoring ribs of the protective shell into the compression zone of the pipe wall concrete in the sections located at the level of the horizontal diameter. The results of the numerical computation are in good agreement with those obtained when testing full-scale specimens of pipes with specified technical parameters.To protect interior faces of reinforced-concrete non-pressure pipes, it is recommended to use lining covers with V-type discrete anchoring members ensuring reliable mechanical fixing of the linings in the pipe wall concrete. This type of anchoring elements causes almost no effect upon the load-carrying ability of pipes

Calculation and Designing of Reinforced-Concrete Non-Pressure Pipes with Inner Lining