Development of Non-Fracture Critical Steel Box Straddle Caps [Project Summary Report]
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2023-05-31
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Abstract:The research study included full-scale experimental testing and parametric finite element (FE) analyses, which resulted in a proposed methodology to estimate the flexural resistance of steel box caps following a potential fracture event. The work was conducted at the Ferguson Structural Engineering Laboratory at The University of Texas at Austin. The following major tasks were completed on this project: 1. Four full-scale specimens were tested to fracture by introducing an initial defect and cooling the steel to lower-shelf temperatures to induce brittle behavior: i. Baseline Specimen: a conventional all-welded box girder with no internal redundancy ii. Specimen A: an all-welded section with added post-tensioning bars anchored at component iii. Specimens B1 and B2: specimens with the bottom flange plate bolted to the rest of the section through flange connection plates, providing cross-boundary separation between these components.
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