Lateral loading of internally pressurized steel pipes

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Lateral loading of internally pressurized steel pipes

Karamanos, S.A. / Andreadakis, K.P. / Gresnigt, A.M.

The paper examines the denting response of tubular members and pipes subjected to lateral (transverse) quasi-static loading, in the presence of internal pressure. Tubes are modeled with nonlinear shell finite elements. The structural response of pressurized tubular members subjected to lateral (transverse) quasi-static loading was examined through advanced numerical tools as well as a simplified analytical model. The numerical results are in good agreement with available experimental data. Using the numerical tools, a parametric study is conducted to examine the effects of pressure level, as well as those of denting device size and pipe end conditions. It is mainly concluded that for a given denting displacement, the presence of internal pressure increases significantly the corresponding denting force. A simplified two-dimensional heuristic model is also adopted, which yields closed-form expressions for the denting force. The model equations are in fairly good agreement with the test results and illustrate pipe denting response in an elegant manner.