Flexural Strength of RC Beam Strengthened by Partially De-bonded Near Surface-Mounted FRP Strip

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• 作者：Soo-yeon Seo ; Ki-bong Choi ; Young-sun Kwon…
• 刊名：International Journal of Concrete Structures and Materials
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：10
• 期：2
• 页码：149-161
• 全文大小：2,453 KB
• 刊物主题：Building Materials; Structural Materials; Structural Mechanics; Continuum Mechanics and Mechanics of Materials;
• 出版者：Springer Netherlands
• ISSN：2234-1315
• 卷排序：10

文摘

This paper presents an experimental work to study the flexural strength of reinforced concrete (RC) beams strengthened by partially de-bonded near surface-mounted (NSM) fiber reinforced polymer (FRP) strip with various de-bonded length. Especially, considering high anchorage capacity at end of a FRP strip, the effect of de-bonded region at a central part was investigated. In order to check the improvement of strength or deformation capacity when the bonded surface area only increased without changing the FRP area, single and triple lines of FRP were planned. In addition, the flexural strength of the RC member strengthened by a partially de-bonded NSM FRP strip was evaluated by using the existing researchers’ strength equation to predict the flexural strength after retrofit. From the study, it was found that where de-bonded region exists in the central part of a flexural member, the deformation capacity of the member is expected to be improved, because FRP strain is not to be concentrated on the center but to be extended uniformly in the de-bonded region. Where NSM FRP strips are distributed in triple lines, a relatively high strength can be exerted due to the increase of bond strength in the anchorage.Keywordsflexural strengthpartially de-bonded NSM FRP stripde-bonded lengthanchorage capacitydeformation capacitysingle and triple lines of FRP