Design and Detailing of Anchorages for Externally Bonded CFRP
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2022-04-01
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Edition:Final Report May 2021 – Nov 2021
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Abstract:Recently, an increased number of CFRP repairs have been applied to strengthen concrete bridges' shear capacity. This poses many challenges as the bridge girder cannot be fully wrapped to ensure that the failure mode is governed by shear fracture combined with or followed by the CFRP fracture. Therefore, instead of fully wrapping the beam with CFRP, the FDOT Structural Design Manual does allow for a three-sided U-wrap, but it needs to be anchored to prevent debonding when considering shear strengthening. The primary method that has been utilized in Florida is the use of spike anchors. Although FDOT has promising results with them, they are invasive and impractical. Therefore, there is a need to explore other anchoring methods. The primary objective of this research is two fold: (1) to perform a synthesis of existing research on the topic of CFRP anchorage design and detailing with interest in externally bonded shear strengthening and other externally bonded end anchorage applications and (2) to provide modifications to current design and detailing guidance of CFRP anchorage. Based on the synthesis, it can be concluded that more tests are needed to better understand the failure mechanism of various anchors for prestressed concrete applications. Given the limited test data, the three most promising CFRP anchors details are proposed. These details include spike anchors, mechanical anchors, and CFRP strip details. However, they should be experimentally validated for their performance.
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