Finite-Element Model Updating and Probabilistic Analysis of Timber-Concrete Composite Beams
Publication: Journal of Structural Engineering
Volume 138, Issue 7
Abstract
Timber-concrete composite beams are an increasingly common design solution for medium-to-long span floors in new buildings. Thus, there is a significant need for accurate models and analysis tools to predict the response and performance of timber-concrete composite beams. In this paper, a nonlinear finite-element (FE) frame model with deformable shear connection is adopted to estimate the short-term structural response of timber-concrete composite beams for which experimental results are available. The FE model is used in conjunction with a probabilistic analysis methodology, which explicitly accounts for the uncertainties in the parameters that describe the constitutive models for timber, concrete, and shear connectors. The objectives of this study are (1) the evaluation of the variability of global and local structural response quantities owing to the uncertainties in the constitutive parameters of timber, concrete, and shear connectors; and (2) the analysis of the correlation between experimental measurements and numerical results based on FE models in which the values of the constitutive parameters are set equal to their experimentally identified mean values and in which the values of the constitutive parameters are optimized through FE model updating, respectively. The results presented in this study show that uncertainties in the constitutive parameters of timber, concrete, and shear connectors have a significant influence on the correlation between the experimental and numerical results. In addition, the optimal values of material parameters obtained using the FE model updating procedure may show substantial variations with respect to the parameters’ mean values as identified in the experimental testing. Prospective developments directed toward design applications and based on the obtained results are also discussed.
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Acknowledgments
The writers would like to acknowledge Mr. Hank Bier (Rotorua, New Zealand) for all of the information provided on the mechanical properties of LVL; Dr. David Yeoh (Universiti Tun Hussein Onn, Malaysia) for providing the experimental data of the composite beams tested in New Zealand, as well as the mechanical properties of the concrete and connection systems used in the same composite beams; and Ms. Melissa G. Schultz for the help kindly provided in proofreading the manuscript. The writers gratefully acknowledge partial support of this research by the LSU Council on Research through the 2009–2010 Faculty Research Grant Program; the Longwell’s Family Foundation through the Fund for Innovation in Engineering Research (FIER) Program; and the Louisiana Board of Regents (LA BoR) through the Louisiana Board of Regents Research and Development Program, Research Competitiveness (RCS) subprogram under Award No. LESQSF(2010-13)-RD-A-01. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the writers and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 138 • Issue 7 • July 2012
Pages: 899 - 910
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Feb 19, 2011
Accepted: Sep 23, 2011
Published online: Sep 26, 2011
Published in print: Jul 1, 2012
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