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Proceedings Paper

Thermomechanical analysis of the Kishwaukee Bridge from global and local deformation measurements
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Paper Abstract

The Kishwaukee bridge (circa 1979) is a five-span pre-cast post-tensioned segmental concrete box girder bridge. The structure has been under increasingly stringent inspection since extensive cracking adjacent to the piers in the webs was observed. There is limited observational evidence that continued propagation of the cracks has been occurring, and static load testing of the structure in 2000 provided direct indications of locally excessive stresses in the shear reinforcement. Since that time, the authors have developed instrumentation which continuously monitors the bridge. Our previous thermal analyses and modeling based upon the data collected demonstrates that thermal equilibrium is rare for this structure, a situation that undoubtably applies to most bridges of this type. Partly due to this constant disequilibrium, basing alarm criteria on real time measurements is untenable. In this paper we develop a two-step monitoring strategy which can be applied to both global and local deformation data. The strategy is based on preliminary modeling to identify the thermomechanical influences, followed by a second step using a bootstrap comparator.

Paper Details

Date Published: 29 July 2004
PDF: 6 pages
Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004); doi: 10.1117/12.540215
Show Author Affiliations
George M. Lloyd, Univ. of Illinois/Chicago (United States)
Ming L. Wang, Univ. of Illinois/Chicago (United States)
Xuan Wang, Univ. of Illinois/Chicago (United States)


Published in SPIE Proceedings Vol. 5391:
Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Shih-Chi Liu, Editor(s)

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