Model updating

The second problem identifies model updating alternatives for a finite element model of the Bill Emerson Memorial Bridge.

The updating methods are based on the use of sensitivity coefficients that iteratively update selected physical element properties (like for example material properties, and joint stiffness) so that correlation between simulated responses and target values improves.The sensitivity method is probably the most successful of the many approaches to the problem of updating finite element models of engineering structures based on vibration test data.It has been applied successfully to large-scale industrial problems and proprietary codes are available based on the techniques explained in simple terms in this article.Sensitivity analysis and model updating require that the user selects reference responses and parameters.Sensitivity coefficients are computed internally by FEMtools using a differential or finite difference method.

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This lead to issue of parameterization and regularization which the limitation and uncertainty in choosing the updating parameter is shown able to be overcome.

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