Mechanical Pull-out Properties of FRP Anchors

The University of Hong Kong
Publication Type:
Conference Proceeding
Asia-Pacific Conference on FRP in Structures, 2007, pp. 775 - 782
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In recent years, the use of externally bonded fibre reinforced polymer (FRP) composites has become popular as a means to strengthen or repair reinforced concrete (RC) infrastructure. The effectiveness of the FRP strengthening may however be compromised by premature debonding failure of the FRP prior to its ultimate strength being reached. An efficient anchorage system to delay/prevent premature debonding failures in RC structural members strengthened with FRP composites is therefore of importance to improve the efficiency, reliability and safety of FRP strengthening systems. To date, several different types of anchorages have been applied to FRPstrengthened RC members, namely embedded metal threads, U-jackets, near surface mounted rods, and anchors made using FRP (i.e. FRP anchors). Embedded FRP anchors are particularly attractive as they are non-corrosive, and can be applied to slabs and walls. Surprisingly little research however has been undertaken on FRP anchors. This paper reports the results of a series of experiments aimed at determining the fundamental behaviour of FRP anchors under pure tension (pull-out) loading. A detailed description of the anchor construction is firstly presented followed by anchor tensile strength results. Pull-out test results of FRP anchors embedded into concrete are then reported with particular attention focused on the failure mechanism, failure load, bond strength and load-displacement response for a range of anchor tests with varying anchor hole diameter and embedment depth.
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