Investigation of Uncertainty Changes in Model Outputs for Finite-Element Model Updating Using Structural Health Monitoring Data

    Authors

    Y. S. Erdogan; M. Gul; F. N. Catbas;P. G. Bakir

    Comments

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    Abbreviated Journal Title

    J. Struct. Eng.

    Keywords

    Finite element; Updating; Calibration; Monitoring; Fuzzy; Uncertainty; Optimization; Gaussian; Dynamics; Modal analysis; Structural health; monitoring; DAMAGE DETECTION; GENETIC ALGORITHMS; QUANTIFICATION; IDENTIFICATION; REGULARIZATION; OPTIMIZATION; SENSITIVITY; SELECTION; ERRORS; Construction & Building Technology; Engineering, Civil

    Abstract

    This article aims to investigate the effect of uncertainties on the predicted response of structures using updated finite-element models (FEMs). Modeling uncertainties are quantified by fuzzy numbers and are incorporated into the fuzzy FEM updating procedure. The impact of the amount and types of data used on the performance of the updated model is investigated. In order to perform the complex FEM updating calculations, which generally take too much time for complex models, a Gaussian process (GP) is used as a surrogate model. The central composite design (CCD) method is used to sample the input parameter space for more accurate GP models. Genetic algorithms (GA) are employed to solve the inverse fuzzy model updating problem. Additional constraints are presented to capture the variation space of the uncertain response parameters. The University of Central Florida benchmark test structure, which is designed to represent short-span to medium-span bridges, is used in the scope of uncertainty quantification study. Static and dynamic experimental test data obtained from the benchmark structure under different loadings and conditions are used for the demonstration. A damage case, in which the stiffness reduction in boundaries is simulated by using flexible pads, is considered. The results show that appropriate data sets, which contain the least uncertainty, should be generated instead of involving the entire set of measurements obtained from different tests. Nevertheless, uncertainty quantification should be employed to find the variation range of uncertain responses predicted by simplified FEM models. (C) 2014 American Society of Civil Engineers.

    Journal Title

    Journal of Structural Engineering

    Volume

    140

    Issue/Number

    11

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    14

    WOS Identifier

    WOS:000344009800002

    ISSN

    0733-9445

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