20.500.12556/DKUM-93642 Numerical investigation of imperfection-induced secondary bending stresses in box girders Numerous studies have demonstrated that the initial out-of-plane deflection can significantly affect stress distribution along the web boundaries of steel plate girders, potentially leading to the initiation of fatigue cracks and eventual structural failure over time. Fatigue cracks in thin-walled structures commonly initiate at locations of maximum secondary bending stress, arising from the web imperfections introduced during the complex manufacturing process and further amplified by the interaction of global and local stresses. The secondary bending stress of box girders web plate has been numerically investigated in this article. Several nonlinear static analyses have been performed, using the hybrid parametric FE model, consisting of shell and beam finite elements. Vertical normal stress in the upper web boundary below rail was evaluated under different boundary conditions and geometric modifications. Considering the deflection shape of critical buckling mode 1, the directional effects of initial web imperfection and eccentric moment have been evaluated. Also, a comparison in terms of secondary bending stress at different girder spans, intermediate plate spacing and load positions are discussed. The results of this study offer valuable insights into the most and least favorable scenarios related to geometric modifications and varying loading conditions, while also highlighting existing research gaps in current design codes. box girder initial web imperfection out of plane deflection secondary bending stress wheel loading škatlasti nosilec začetna nepopolnost spleta odklon iz ravnine sekundarna upogibna napetost obremenitev koles true false true Elsevier Angleški jezik Slovenski jezik https://www.sciencedirect.com/science/article/pii/S2352012425012925 Članek v reviji 2025-07-09 10:26:51 2025-07-09 10:26:51 2025-07-10 03:36:34 0000-00-00 00:00:00 2025 0 0 13 str. Vol. 79, [article no.] 109477 September 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-03-06 2025-06-15 2025-06-18 539.3:519.6 241885187 10.1016/j.istruc.2025.109477 2352-0124 1-s2.0-S2352012425012925-main.pdf 1-s2.0-S2352012425012925-main.pdf 1 4D22D169B2CB8B223586D1E419946B3F 8a1c8443c65fce2feedaf0b679f9da6cd01a5ea9c8e758f348409649d929e8ba 28f0aac5-5c9f-11f0-8f2d-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193396 https://www.sciencedirect.com/science/article/pii/S2352012425012925 0 313f8cb0-5c9f-11f0-8f2d-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193397 Fakulteta za strojništvo 0 0 0