United States Department of Transportation
i
Prestress Losses and Development of Short-Term Data Acquisition System for Bridge Monitoring [Research Brief]
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2019-06-01
[PDF-654.82 KB]
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Abstract:For example, for prestressed, precast concrete girder bridges, an accurate estimation of the prestress force is needed for proper design. However, obtaining information on the behavior of in-place bridges can be challenging. Researchers used a short-term data acquisition system to obtain bridge behavior data under live loads. They also used embedded instrumentation to quantify prestress losses. Based on the measured data, the traffic on the Nibley Bridge near Nibley, UT) regularly exceeded American Association of State and Highway Transportation Officials (AASHTO) HS-20 truck loading specifications, with recorded strains of up to 59.26 με. The largest loading events approached (but did not exceed) the HL-93 design loads. Because the monitoring took place over a relatively narrow span of time, it was theorized that the maximum strains experienced by the bridge girders could be even higher than the measured values.
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