Finite Element Model Updating of a Connecting Structure Based on Strain

In terms of the fact that model simplification and equivalence is inevitable during the modeling process. In this paper, model updating of a connecting structure in the static condition was conducted. The process to obtain theoretical static responses was briefly introduced, and the correlation of static response was defined. And then, the fundamental of model updating and thin-layer elements were described. In order to verify the effectiveness of the method, taking a connecting structure as the object, a series of activities including structure modeling, model updating and response prediction were conducted. The connecting structure was divided into several substructures, each of them were meshed with solid elements. The interfaces between substructures were represented by thin-layer elements. And the boundary conditions were represented by bush elements. After sensitivity analysis, parameters to be calibrated were selected. Based on the experimental tests of multi load cases, the model updating of the connecting structure was accomplished. The result shows that, the model after updating can reproduce responses that used in the process of model updating. In addition, the responses that are not used in model updating are predicted precisely.