Kumar, G.Kaliveeran, V.2026-02-082024Springer Proceedings in Materials, 2024, Vol.36, , p. 205-21526623161https://doi.org/10.1007/978-981-96-5732-2_19https://idr.nitk.ac.in/handle/123456789/33579Offshore pipelines are subjected to various types of loading, depending upon the sub-sea conditions during their design life. Buckling is a major structural instability problem in the offshore pipelines operating at high pressure and high temperature, along with other causes. Various kinds of non-prismatic sections are generally used in special areas of the pipeline system. The present research work focuses on estimating the structural response (bucking strength, in particular) of the non-prismatic offshore pipelines. Eigenvalue buckling analysis using the Finite Element (FE) method was conducted to find the buckling strength and mode shape of the pipeline model. The non-prismatic pipeline was modeled as 1-D and 3-D FE models; the 1-D model was analyzed using the MATLAB program, and the complete 3-D model was analyzed using the ANSYS workbench. Both the 1-D and 3-D numerical analysis results were compared and verified experimentally. The results of the analysis and their convergence pattern were also discussed. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Eigenvalue buckling analysisFinite element methodMode shapeOffshore pipelines