The Relative Strain as a Design Criterion for Buried uPVC Gravity Sewer Pipesby Lars-Eric Janson, VBB Consulting Group, Stockholm, Sweden,
Abstract: When designing buried plastic sewer pipes, the relative strain caused by deflection of the circular pipe section is of particular interest. The reason for increased interest is the present development going on in many pipe factories, with attempts to find lighter pipe structures to minimize the amount of pipe material needed. A common way is to increase the effective wall thickness according to the I-beam principle. The structural possibilities available for optimizing the relation between pipe stiffness and pipe material needed, will in many cases be limited by the largest permissible strain of the pipe material. In a previous report a method is suggested for determining the permissible constant strain value under stress relaxation condition for HDPE. In the present paper the same method is applied for determining the corresponding strain value for uPVC gravity sewer pipes.
Subject Headings: Pipe materials | Strain | Buried pipes | Plastic pipes | Plastic design | Sewer pipes | Construction materials
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