1,721,082 research outputs found
The interval intersection method for FE model updating
No full textIn this work a method for finite element (FE) model updating based on interval analysis is presented. The interval analysis inclusion theorem is exploited to achieve a solution of the model updating problem. The solution algorithm is implemented in the automatic procedure named interval intersection method (INTIM). A basic and a refined version of the method and their implementations are presented. Solutions of a numerical example are provided to show the method capabilities compared with a classical sensitivity method
Some remarks on possibilistic/probabilistic analysis of structures. Atti del convegno, “LSAME.08, Non-Deterministic modelling workshop - NDM.08”, Leuven (BE)
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Mechanical Identification and Model Validation for Shear-Type Frames
No full textIn the field of civil structural engineering great effort is being devoted to develop robust identification procedures for characterisation of dynamical behaviour, that concern characterisation of both modal and structural parameters. In this work, a procedure for identification of "shear- type" multi-storey frames in free vibrations is tested. "shear-type" models are very often used in civil engineering and are characterised to have just a few significant degrees of freedom (dofs, i.e. floor displacements). The procedure is composed by two consecutive steps: (1) identification of the experimental modal model from data acquisition in time domain; (2) updating of an a priori finite element model (FEM) of the structure by comparing identified modal quantities. A rational fractional polynomial technique is used to obtain the experimental modal behaviour of the structure and an eigensensitivity model updating technique to modify the structural parameters of an FEM. The whole procedure is applied to a laboratory three floor "shear-type" framed structure to provide an updated FEM. An experimental validation is performed using the updated model to predict the effect of structural modifications upon the modal behaviour variation both in the laboratory frame and in the FEM
An Interval Based Technique for FE Model Updating
No full textModel updating techniques are largely used in civil and mechanical engineering to obtain reliable FE models. The model parameters are iteratively adjusted until the model response matches the measured structural response within a given tolerance. The task is made difficult by the uncertainty that affects both the structural response and the model parameters. In this work, the uncertainty is taken into account by a proper formulation of the problem in the framework of interval analysis. Uncertainty is replaced by interval numbers, functions are replaced by their thin or thick natural extension and the inclusion theorem is exploited to find the problem solution. Sample applications are illustrated using a modal representation of the structure. A numerical example is used to discuss the potential of the proposed method. A case study is solved to demonstrate the advantages of the method with respect to conventional updating techniques
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