Page 122 - Buried Pipe Design
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Design of Gravity Flow Pipes 97
D
Time, (Hours)
Figure 3.13 PVC pipe creep response.
deflection was determined. The starting deflections are somewhat
arbitrary. Four of these tests were begun at about 4.75 percent
deflection, and two were begun between 9 and 9.5 percent deflection.
The loads required to produce these deflections were different in
each case.
Note that for the temperature range tested, an equilibrium state is
reached, and the pipe does not deflect beyond that point. The limiting
Pipe Deflection, %
Elapsec Time, (Hours)
Figure 3.14 Time deflection curves in temperature-controlled soil cell test.
