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Thermomechanical analysis of long-term global modal and local deformation measurements of the Kishwaukee Bridge using the bootstrap

George M. Lloyd, Ming L. Wang and Xuan Wang

Department of Civil and Material Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, Illinois 60607, USA

Abstract: In this paper we present a comparative analysis of global frequency and local deformation data for a large concrete bridge. The asymptotic probability distributions of the central statistics are presented, and compared with empirical bootstrap estimates. Bootstrapped distributions are calculated from reference data obtained during 1999-2000 and used to develop change-point alarm criteria for the structure, using reasonable sensitivity measures developed from FEM simulations and structural analysis. The implications of the frequency data are discussed in conjunction with the strain and displacement measurements in order to discern if the load carrying capacity of the bridge has been affected. The critical need for more advanced temperature compensation models for large structures continually in thermal disequilibrium is discussed.

Keywords: thermomechanical effects; bootstrap methods; local & global monitoring; long term measurement; concrete bridge