The paper focuses on the denting response of pipeline segments subjected to lateral quasi-static wedge loading, in the presence of internal pressure. Using nonlinear finite element tools, a parametric study has been conducted and load-deflection curves have been obtained for different levels of pressure, for various wedge shapes and for different types of boundary conditions (capped-end, fixed-end and free-end). The main result from the parametric study is that the presence of internal pressure causes a substantial increase of the denting resistance force. In addition, the presence of pressure reduces the denting length, causing a more localized deformation. The numerical results are found in good agreement with test data from internally-pressurized pipe specimens subjected to wedge-type lateral loading. Finally, an 'enhanced' three-dimensional simplified analytical model is developed, illustrating the effects of pressure on the denting resistance, as well as the influence of several parameters of the response, towards better understanding of pressurized tube deformation. The model, initially introduced elsewhere for non-pressurized pipes, is based on a four-moving-hinge plastic mechanism, and accounts for longitudinal stretching, and pressure effects under various end conditions. The model yields an elegant analytical solution, capable of predicting the denting response of inelastic pipes within a good level of accuracy.
Pipe response under concentrated lateral loads and external pressure
Rohrantwort unter konzentrierten lateralen Belastungen und externem Druck
2006
11 Seiten, 13 Bilder, 22 Quellen
Conference paper
English
Response of pressurized steel tubes and pipes under concentrated lateral loads
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