Flexible (non-bonded) polymeric sewer linings are used extensively to renovate both gravity andudpressure pipes. Linings for both types of pipe are subject to collapse pressures, and in the caseudof gravity pipes this is the dominant source of loading; the efficient design of linings to sustainudcollapse pressures is therefore an important problem. In this paper, the buckling of an ideal thinwalledudelastic lining in a rigid cylindrical cavity is first presented as a simple closed form solution,udand The effect of a representative small imperfection shown to be significant. The different types ofudimperfection that can be encountered in practical lined pipe systems are identified, and theudsituations in which each can arise are discussed. A generalised procedure for obtaining theudstructural imperfections in, and hence buckling capacities of, practical systems is then presentedudand two example applications are used to illustrate its application in specific situations.
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