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Proceedings Paper

Predicting deflections of a simply supported pre-stressed concrete girder subjected to static loads from observed strains
Author(s): Aftab Mufti; Leslie Jaeger; Chad Klowak; Nikolas Kyriakopoulos; Baidar Bakht; Gamil Tadros
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Paper Abstract

Deflections of structures, such as bridge girders, are often the most difficult to monitor. Strain measurement is relatively simple with the use of electronic strain gauges, fiber optic sensors, or other strain measuring devices. This paper investigates two different methods for predicting or monitoring the deflection of a simply-supported full-scale bridge girder subjected to a partially distributed uniform load using strain measurements. A full-scale pre-stressed concrete bridge girder was instrumented and tested under a static monotonic load in the linear elastic range. This paper highlights the experimentally measured deflections along the length of one half of the girder and compares them to theoretically predicted deflections and deflections predicted using numerical integration along with harmonic analysis of curvatures determined from theoretical and observed experimental strains. Experimental test results indicate that estimating deflections from observed strains is feasible within the linear-elastic range of such girders. The methods outlined for predicting deflections of full-scale pre-stressed concrete bridge girders from observed strains are a valuable tool for structural engineers and for the periodic and continuous monitoring of civil structures such as bridges.

Paper Details

Date Published: 19 April 2007
PDF: 12 pages
Proc. SPIE 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007, 65310T (19 April 2007); doi: 10.1117/12.716960
Show Author Affiliations
Aftab Mufti, ISIS Canada Research Network (Canada)
Leslie Jaeger, Dalhousie Univ. (Canada)
Chad Klowak, ISIS Canada Research Network (Canada)
Nikolas Kyriakopoulos, ISIS Canada Research Network (Canada)
Baidar Bakht, ISIS Canada Research Network (Canada)
Gamil Tadros, ISIS Canada Research Network (Canada)


Published in SPIE Proceedings Vol. 6531:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007
H. Felix Wu; Aaron A. Diaz; Peter J. Shull, Editor(s)

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