Der III. Lastfall für die statische Bemessung von verklebten Drucklinern – Biegezugbruch durch Haft‐ und Reibungsabtragung

The 3^rd load case of liner design for rehabilitation of pressurized piping system – flexural tension failure induced by stick and friction force transfer. Based on the practical experience in consulting rehabilitation of pressurized piping systems by using cured‐in‐place pipe and theoretical investigation, a new failure model (flexural tension failure induced by friction transfer) of liners has been illustrated. This failure model is seen as the III. load case, in comparison to load caseI (gravity pipe) and II (pressure pipe) according to ASTM F1216 – 98. In this aspect, a calculation model for the static design of liners has been developed by using finite element method. The numerical study by using the calculation model has indicated some essential influence factors for this load case in the combined liner‐host pipe‐system. Upon these, suggestions have been made for further experimental investigation and for an economical solution avoiding this type of liner failure.