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Improved bridge evaluation through finite element model updating using static and dynamic measurements

Hendrik Schlune (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Mario Plos (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Kent Gylltoft (Institutionen för bygg- och miljöteknik, Konstruktionsteknik)
Engineering structures (0141-0296). Vol. 31 (2008), 7, p. 1577-1485.
[Artikel, refereegranskad vetenskaplig]

The potential of combining finite element (FE) analysis with on-site measurement through finite element model updating is indisputable. However, simplified initial models and too few measurements can lead to updated model parameters which conceal inaccurate modelling assumptions rather than improve estimates of the actual structural parameters. Therefore, the methodology proposed aims primarily to eliminate inaccurate modelling simplification by means of manual model refinements before parameters are estimated by non-linear optimization. In addition, multi-response objective functions are introduced, which allow combing different types of measurements to obtain a solid basis for parameter estimation. The proposed methodology was applied to one of the world’s largest single-arch bridges, the new Svinesund Bridge, and disclosed a need to use a non-linear model in order to estimate the structural parameters more accurately. The resultant model could reproduce the measurements with significantly improved accuracy without assigning unrealistic values to model parameters.

Nyckelord: Model updating; Parameter estimation; Structural identification; System identification; Multi-response; Finite element method



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Denna post skapades 2016-08-18.
CPL Pubid: 240418

 

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