United States Department of Transportation
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Bridge-in-a-Backpack™: Task 3.2: Investigate Soil–Structure Interaction – Modeling and Experimental Results of Steel Arches
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2015-07-01
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[PDF-2.03 MB]
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Alternative Title:Bridge-in-a-Backpack tm Task 3.2: Investigate Soil–Structure Interaction – Modeling and Experimental Results of Steel Arches;Task 3.2: investigating soil - structure interaction - modeling;and experimental results of steel arches.;
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Edition:Final Report
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Abstract:This report includes fulfillment of Task 3.2 of a multi-task contract to further enhance concrete filled FRP tubes, or the Bridge in a Backpack. Task 3 is an investigation of soil-structure interaction for the FRP tubes. Task 3.2 is the modeling and experimental results of steel arches. This report briefly outlines testing procedures, finite element (FE) modeling methods, and compares models with selected experimental results. The full test plan included two, 6.1 m span, half scale CFFT arches and two stiffnessmatched steel arch bridges of the same geometry; scaling properties are discussed in a separate report (Walton et al 2015). Results in this report are limited to the two steel bridges. CFFT arches experience significant concrete cracking during service loading, which reduces experimental repeatability. Further, the accurate determination of arch axial force and bending moment from measured strains is difficult. In contrast, the steel arches were designed to remain linear-elastic throughout backfilling and service-level live loading, which allows for accurate determination of arch internal stress resultants from measured strains and comparison with the FE model results. The experimental results and models focus on bending moment, which is typically the critical buried arch bridge design parameter, supplemented with measured deflection and pressure results from testing. Experimental investigation and model results explore three distinct load conditions presented herein: backfilling process, vehicular live load, and ultimate capacity under apex live loading.
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