Concrete Slab on Steel Girder (CSSG) bridges are one of the most common bridge types in Canada. Web distortion is a plausible failure mode for girders of CSSG bridges with relatively deep webs, depending on the bracing conditions. It is a common practice to utilize shell element-based finite element models to capture complex buckling modes such as web distortional buckling. However, shell element analysis is computationally costly for modelling and interpreting their results requires expert skills. Compared with shell elements, beam element formulations capable of capturing distortional web behaviour may be a more feasible solution. However, commercial software often does not offer special beam elements capable of modelling the distortional buckling behaviour of thin-walled bridge girder components. The distortional beam formulations available in the literature are often used only via in-house coding; therefore, bridge owners, designers and researchers are generally not familiar or do not have access to modelling options with such specialized beam elements. To offer a more practical means of evaluating the web distortional buckling behaviour of steel girders, a set of beam-type elements has been formulated, namely DBF13. Some of the capabilities of one of these elements were previously demonstrated by comparing against shell elements in the literature. This study further expands the comparative evaluation of these beam elements to a variety of commonly utilized bridge girder geometries and restraint conditions through a parametric study. Firstly, a comparative analysis was conducted for a lateral torsional buckling case using several shell elements, both from ANSYS and ABAQUS elements libraries as well as DBF13 beam elements. Then, the predicted buckling loads and shapes for web distortion-type buckles were presented for the developed beam elements and ANSYS SHELL281 element. The current limitations and future development plans are outlined.

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Distortional Buckling Analysis of Steel Bridge Girders: A Comparison of Beam and Shell Element Modelling

  • Istemi F. Ozkan,
  • Ryan Heywood,
  • Hussein Atia,
  • Mithuna Kandasamy,
  • Emre Erkmen

摘要

Concrete Slab on Steel Girder (CSSG) bridges are one of the most common bridge types in Canada. Web distortion is a plausible failure mode for girders of CSSG bridges with relatively deep webs, depending on the bracing conditions. It is a common practice to utilize shell element-based finite element models to capture complex buckling modes such as web distortional buckling. However, shell element analysis is computationally costly for modelling and interpreting their results requires expert skills. Compared with shell elements, beam element formulations capable of capturing distortional web behaviour may be a more feasible solution. However, commercial software often does not offer special beam elements capable of modelling the distortional buckling behaviour of thin-walled bridge girder components. The distortional beam formulations available in the literature are often used only via in-house coding; therefore, bridge owners, designers and researchers are generally not familiar or do not have access to modelling options with such specialized beam elements. To offer a more practical means of evaluating the web distortional buckling behaviour of steel girders, a set of beam-type elements has been formulated, namely DBF13. Some of the capabilities of one of these elements were previously demonstrated by comparing against shell elements in the literature. This study further expands the comparative evaluation of these beam elements to a variety of commonly utilized bridge girder geometries and restraint conditions through a parametric study. Firstly, a comparative analysis was conducted for a lateral torsional buckling case using several shell elements, both from ANSYS and ABAQUS elements libraries as well as DBF13 beam elements. Then, the predicted buckling loads and shapes for web distortion-type buckles were presented for the developed beam elements and ANSYS SHELL281 element. The current limitations and future development plans are outlined.