20.500.12556/DKUM-98426 A modified predictive model for the critical compressive strain of large diameter girth-welded pipelines The compressive strain capacity of large diameter girth-welded pipelines is a primary concern in strain-based design, especially under severe geohazard loading. To accurately evaluate this capacity, a nonlinear buckling analysis model subjected to combined internal pressure and bending loads is established. The critical compressive strain is defined as the average strain over a gauge length of 1.0D at the onset of buckling. Numerical results indicate that the critical compressive strain decreases as misalignment amplitude increases, while the effect of misalignment angle shows an opposite trend. The buckling results obtained from numerical simulations are compared with four models introduced in engineering standards/codes, and a good agreement with the CRES prediction model is observed. Building on this basis, the FGI term in the CRES model is modified to account for girth-welded pipelines with different misalignment types, amplitudes and angles. Consequently, a modified predictive model is proposed. It is demonstrated that, within the numerical database considered in this study, the modified model achieves a fitting accuracy exceeding 97%. Finally, independent finite element simulations considering different D/t ratios, internal pressures, and material hardening characteristics are conducted to further validate the applicability of the FDP and FYT terms. girth-welded pipes local buckling critical compressive strain misalignment combined loads obočno varjene cevi lokalno upogibanje kritična tlačna deformacija neusklajenost kombinirane obremenitve true false true Elsevier Ltd. Angleški jezik Slovenski jezik https://www.sciencedirect.com/science/article/pii/S026382312600755X Članek v reviji 2026-06-11 15:25:15 2026-06-11 15:25:15 2026-06-12 03:06:35 0000-00-00 00:00:00 2026 0 0 16 str. part A [article no.] 115231 Vol. 230 Nov. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2026-01-20 2026-06-03 2026-06-04 621.791:539.3 281344259 10.1016/j.tws.2026.115231 0263-8231 2026-TWS-Girth_weld.pdf 2026-TWS-Girth_weld.pdf 1 D9D7BD2DA3EAA5BCEC4E76D0613B4F31 4f834fccc99d7537f61127bfc29235d9c09892ee3c463499d31c7ce985fe918d 0cb4245b-659a-11f1-acb0-00155d580e34 https://dk.um.si/Dokument.php?lang=slv&id=207043 https://www.sciencedirect.com/science/article/pii/S026382312600755X#da0005 0 1cc52076-659a-11f1-acb0-00155d580e34 https://dk.um.si/Dokument.php?lang=slv&id=207044 Fakulteta za strojništvo 0 0 0