Component mode synthesis techniques for finite element model updating

Deterministic and Bayesian finite element (FE) model updating techniques are computationally very demanding operations due to the large number of FE model re-analyses required. Component mode synthesis techniques are proposed to carry out the re-analyses efficiently in a substantially reduced space of generalized coordinates using exact component modes and characteristic interface modes computed only once from a reference FE model. The re-assembling of the reduced-order system matrices from components and interface modes is avoided. Theoretical and computational developments are demonstrated with model updating and damage identification applications for a highway bridge using a high fidelity model and simulated measurements.

► A CMS method is proposed to handle large number of FE re-analyses in model updating. ► Re-analyses of component fixed and characteristic interface modes are avoided. ► The method integrates well in deterministic and Bayesian FE model updating. ► A high fidelity model of a highway bridge demonstrates the method’s effectiveness. ► Remarkable reduction of computational effort is achieved.