Relining with large diameter GRP pipes

The relining of large diameter pipelines with GRP pipes is worldwide continuously growing over the past 20 years. For the structural design of liner pipes with significant deviations to circular shapes are no standards or guidelines available. The ATV-M127 Part2 and the WRC SRM (sewer rehabilitation manual) provide only hints and notes for a coarse calculation of non circular liner pipes, but no comprehensive structural design. In particular arch-profiles, kite-profiles or profiles with inverts can merely designed by the previous mentioned guidelines. A reliable approach for the structural design of these kinds of profiles is the finite element method.