Short-Term Versus Long-Term Pipe Ring Stiffness in the Design of Buried Plastic Sewer Pipesby Lars-Eric Janson, VBB Consulting Ltd, Sweden,
Abstract: It is often discussed which pipe ring stiffness should be used when designing the long-term deflection of buried plastic sewer pipes; the short-term value or the long-term value? As the question concerns viscoelastic materials such as PVC, PE and PP, it is easy to understand why it is believed that the stress-dependent creep of the plastic material must be considered in the assessment. This paper evaluates the question, and it is shown that in general only the short-term value is of significance for the long-term deflection of the pipe.
Subject Headings: Pipelines | Plastic pipes | Stiffening | Plastic design | Sewers | Displacement (mechanics) | Buried pipes | Viscoelasticity
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