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Long-Term Performance Predictions of the North Halawa Valley Viaduct
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2003-06-01
[PDF-1.79 MB]
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Edition:Research Report
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Abstract:This report compares long-term field measurements recorded by instrumentation on the North Halawa Valley Viaduct (NHVV) with long-term predictions from SFRAME, a time dependent finite element analysis program. The long-term structural responses considered in this study are the concrete longitudinal strain, span shortening, prestress losses, and vertical deflection. Field measurements are compared to SFRAME predictions using as-built input files developed by T.Y. Lin International during design and construction of the viaduct. Updated material properties and improved creep and shrinkage prediction models were used by prior researchers to develop an improved SFRAME prediction model for the instrumented Unit 2IB of the NHVV. This improved prediction model is applied to all six units of the NHVV and compared with optical surveys performed by the State of Hawaii during regular maintenance of the structure. In order to provide a tool for use in estimating future long-term bridge performance, a prediction envelope is proposed. This envelope is based on short-term material property tests and estimated parametric variability to provide upper and lower bounds for the long-term structural response. The envelope is applied to all six units of the NHVV for vertical deflection, span shortening, and tendon prestress losses and is shown to provide a reliable estimate of the measured response.
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