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From: Atkins Software Information:
http://www.lusas.com/case/bridge/critical_buckling_analysis.html
”Making the most of Eurocodes for critical buckling analysis:
- Investigations into the implications of changing to Eurocodes for bridge design
- Comparison of analysis of first and second order effects for critical buckling analysis
- Increased load factors obtained - especially for nonlinear analysis"
"Atkins, the UK’s largest engineering consultancy, has been carrying out investigations into the implications of using the new Eurocodes for UK bridge design. As part of its study finite element test models were created in LUSAS Bridge to assess particular aspects of the new codes. From analyses carried out, significant benefits have been seen when using the new Eurocodes for linear and nonlinear investigations into critical buckling analysis of steel girder structures with transverse stiffeners"
Shown here is a nonlinearly deformed finite element model for evaluating the adequacy of transverse stiffeners in a bridge girder under bending such that diagonal tension develops in the post-buckled web.
"A model of a plate girder with a central load was one of many set up by Atkins on behalf of the UK’s Highways Agency to investigate the Eurocode rules for transverse stiffeners resisting shear [the development of diagonal tension in the web]. The model was created in accordance with the requirements of EN 1993-1-5 and modelled the geometry of an actual physical test specimen that was tested in the 1980s. Chris Hendy said: 'Not only did the nonlinear LUSAS model give results almost identical to the actual physical test specimen but it also showed that the EN 1993-1-5 rules for stiffeners were very conservative for this particular beam, and the BS 5400 Part 3 predictions even more so.' "
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