FIGURE 28.19 Seismic ovaling coefficient curves (© Parsons Brinckerhoff Inc. 1993, with permission).

the diameter change and bending strain but significantly lower values of thrust-induced strain than the no-slippage condition. Therefore, Equation 28.13 should not be used unless a full-slippage mechanism is incorporated in the design. Instead, the no-slippage condition should be assumed in deriving the thrust-induced strain as follows [12]:

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