Influence of weld rigidity on the non-linear structural response of beams with a curved distortion
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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-11-01
Department
Major/Subject
Mcode
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Language
en
Pages
13
Series
Engineering Structures, Volume 246
Abstract
This study investigates an analytical beam model to improve the analyses of welded thin plates with welding-induced curved distortions. The model addresses the rigidity of a butt-welded joint and its effect on plate bending and structural stress by including a rotational spring at the welded end. The spring rotational stiffness, k(a), is replaced by the fixity factor, rho(a) . The validity of the model is based on the assumption of small displacement and moderate rotation of the mid-plane of the welded plate. Using the Finite Element Analysis of a two-dimensional model, a semi-analytical method for the fixity factor computation is developed. Compared with the numerical analysis, the beam model showed a maximum error of 3% in deflection and hot-spot structural stress. Results suggest that the fixity factor is mainly dependent on the width of the weld bead and the far-end constraint. The introduction of rho(a) can improve the analytical solution by 9% in the evaluation of the hot-spot structural stress. Neglecting the non-ideal joint rigidity may lead up to 54% underestimation in terms of fatigue life, when the S-N curve slope, m, equals 5. However, the relevance of rho(a) decreases for increasing geometric slenderness of the welded plates.Description
Keywords
Thin plate, angular misalignment, Welded joint, Fixity, structural stress, Hot-spot, Stress magnification factor
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Citation
Mancini, F, Remes, H, Romanoff, J & Gallo, P 2021, ' Influence of weld rigidity on the non-linear structural response of beams with a curved distortion ', Engineering Structures, vol. 246, 113044 . https://doi.org/10.1016/j.engstruct.2021.113044