Proposed Design of Internally Redundant Steel Box Straddle Caps
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2025-01-01
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Edition:Technical Report August 2019 - May 2023
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Abstract:Steel box straddle caps are classified as Fracture Critical Members, requiring stringent design, fabrication, and in-service inspections to comply with the provisions of the Fracture Control Plan. Providing internal redundancy to steel box straddle caps to remove the Fracture Critical inspection requirements is highly desirable. The research conducted explores two possible approaches to provide internal redundancy to steel box straddle caps by (i) adding high-strength bars as a secondary tensile element and (ii) providing cross-boundary fracture resistance between the components in tension. A full-scale experimental program was conducted and complemented with finite element modeling. The results of these studies are discussed, and design recommendations and examples are provided.
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