Measuring Support Reactions in a Composite Model Bridge Using Distributed Fibre Optic Sensing
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Authors
Gillham, Jack
Sturm, Richard
Hoult, Neil A.
Bentz, Evan C.
Date
2023-04-23
Type
journal article
Language
en
Keyword
Alternative Title
Abstract
This paper investigates the potential of using distributed fiber optic sensing (DFOS) to evaluate load distribution and support reactions within a statically indeterminate structure. A multibeam two-span composite model bridge was built and instrumented with DFOS. Three different loading scenarios (full width, concentrated, and offset) and two different slab thicknesses were used to investigate their impact on load distribution and reactions forces. Disturbed regions near the supports meant that shear forces, and thus reactions, could not be measured in this region and thus had to be extrapolated. Two extrapolation techniques (linear and second order) were developed and evaluated using a grillage model. The second-order fitting technique provided more accurate reaction forces for the grillage model and was then used with the distributed strain data from the model bridge to estimate the reactions. Challenges associated with the scale of the experiment were identified that should result in better performance on full-scale structures.
Description
This is the accepted manuscript of Gillham, J.; Sturm, R.; Hoult, N. A.; Bentz, E. C. Measuring Support Reactions in a Composite Model Bridge Using Distributed Fiber Optic Sensing. Journal of structural engineering (New York, N.Y.) 2023, 149 (7). https://doi.org/10.1061/JSENDH.STENG-12151. The publisher's version is available at ACSE site at https://doi.org/10.1061/JSENDH.STENG-12151.
Citation
Gillham, J.; Sturm, R.; Hoult, N. A.; Bentz, E. C. Measuring Support Reactions in a Composite Model Bridge Using Distributed Fiber Optic Sensing. Journal of structural engineering (New York, N.Y.) 2023, 149 (7). https://doi.org/10.1061/JSENDH.STENG-12151
Publisher
American Society of Civil Engineers