Temperature-Based Structural Identification of Long-Span Bridges
Publication: Journal of Structural Engineering
Volume 141, Issue 11
Abstract
Temperature-based structural identification (TBSI) is a quantitative structural evaluation approach that relies on responses resulting from temperature fluctuations. Through this approach, the transfer function that defines how thermal induced strains give rise to global displacements and restrained member forces can be captured. This input-output relationship is highly sensitive to mechanisms that pose modeling challenges, such as boundary and continuity conditions, and thus is quite valuable within the model updating process. The method follows the traditional structural identification (St-Id) framework with a priori modeling, experimentation, and model calibration steps appropriately modified to allow for the measurement and simulation of temperature-induced responses. TBSI was evaluated through the use of simulations and laboratory experiments and then implemented to identify an arch bridge. In addition, a comparative study was performed with an independent evaluation of the same bridge using ambient vibration structural identification (AVSI). The results indicate that TBSI and AVSI are synergistic providing complementary information related to a diverse range of structural performances. In addition, the results illustrate several TBSI strong points, including (1) the ability to identify both linear and nonlinear behaviors, (2) the ability to efficiently capture response patterns with long periods, and (3) a strong correlation between the captured transfer function and the behavior of boundary and continuity conditions.
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Acknowledgments
The research reported in this paper was supported by the National Science Foundation under grant number CMMI-0846591 and the Burlington County Bridge Commission. In addition, the authors would like to acknowledge Jeffrey Weidner, Nathan Dubbs, John Prader, and Ehsan Minaie of Intelligent Infrastructure Systems LLC and John DeVitis, David Masceri, and Aliya Turner of Drexel University for their support throughout this research.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 13, 2013
Accepted: Jan 7, 2015
Published online: Feb 19, 2015
Discussion open until: Jul 19, 2015
Published in print: Nov 1, 2015
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