Author(s): Magnus Larson; Lennart Jonsson
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Keywords: No Keywords
Abstract: The effect of hydraulic transients on water and sewage pipes was studied by simultaneously measuring the pressure and the strain in pipes during field conditions. Both the axial and circumferential strain were recorded for several different pipe materials including stainless steel, cast iron, and PVC plastic. Measurements were also performed by digging out a buried pipe and recording the pipe response during transient loading with and without full soil load. In most cases investigated an assumption of plane strain in the pipe was valid since the pipes were axially restrained from moving. The pipe response during hydraulic transients was in general well described using linear-elastic theory with a modulus of elasticity corresponding to static loading. A soil load enhanced the strength of the pipe, indicated by a lower measured strain for a certain pressure in comparison with measurements for cases without soil load, thus having an effect similar to an increase in the modulus of elasticity.
Year: 1991