Pull-out and shear-strength models for FRP spike anchors

Llauradó, Paula Villanueva; Ibell, Tim; Gómez, Jaime Fernández; Ramos, Francisco José González

doi:10.1016/j.compositesb.2017.02.029

Cited by 46 publications

(8 citation statements)

References 26 publications

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“…Load-bearing capacity calculated according to the equations presented fits the available data in pull-out and shear. To find out more about this design modeling and the test results, please see previous works by the authors 7,14 .…”

Section: Representative Resultsmentioning

confidence: 99%

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

Llauradó

Fernández-Gómez

González-Ramos

2018

JoVE

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Fiber reinforced polymer (FRP) anchors are a promising way to enhance the performance of externally-bonded FRPs applied to existing structures, as they can delay or even prevent debonding failure. However, a major concern faced by designers is the premature failure of the anchors due to stress concentration. Poor installation quality and preparation of the clearance holes can result in stress concentration that provokes this premature failure. This paper deals with an installation method that aims to reduce the impact of the stress concentration and to provide a proper quality control of the preparation of the drill hole. The method involves three parts: the drilling and cleaning of the holes, the smoothing of the hole edges with a customized drill bit, and the installation of the anchor itself, including the impregnation of the anchor dowel and its insertion. Anchor fans (the free length of the spikes) are then bonded to the external FRP reinforcement. For the end anchorage, and in the case of reinforcements with multiple plies, it is recommended that the anchor fan be inserted between two plies to assist the stress-transfer mechanism. The proposed procedure is complemented with a design approach for spike anchors, based on an extensive database. It is proposed that the design follow a number of steps, namely: selection of the anchor diameter and subsequent tensile strength of the connector (that is to say, the anchor before fanning out the free end), evaluation of the reduction in the tensile strength due to bending, provision of enough embedment to prevent slippage failure, and consideration of the number and spacing of anchors for a given reinforcement. In this sense, it should be noted that further research is needed in order to obtain a general expression for the contribution of spike anchors to overall bond strength of FRP reinforcements.

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Section: Representative Resultsmentioning

confidence: 99%

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

Llauradó

Fernández-Gómez

González-Ramos

2018

JoVE

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“…(1) = (0.07 + 0.45) A recent study has modified those empirical equations by including the impact of embedded depth ( ) and angle ( in degrees) [14]. The modified equation is shown as follows: ℎ (4) = (0.3ℎ /150 + 0.5 /90 0 )…”

Section: Current Design Recommendations On Spike Anchorsmentioning

confidence: 99%

“…embedment depth ( ), bend radius ( ) and embedded angle ( ) (see Fig. 1 (b)) determines both the capacity and ℎ failure mode of anchored EB FRP sheets [14]. In order to prevent an anchorage system being pulled off, the minimum embedment depth was recommended to be at least 100 mm or 4 inch [15].…”

Section: Introductionmentioning

confidence: 99%

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An effective improvement for enhancing the strength and feasibility of FRP spike anchors

Sun

Liu

Zhang

2020

Composite Structures

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Spike anchors are promising remedies to prevent the debonding failure of FRP sheets. The performance of anchored FRP sheets largely depends on critical parameters such as the extending bond length of FRP sheet over the embedded spike and bend radius, greatly limiting their efficiency and feasibility in field. Moreover, their long-term performance dealing with possible bond loss is still unknown. Recently, an anchorage system consisting of a spike anchor and two patches has been developed. This anchorage system was expected to have several advantages over conventional spike anchors, which were rarely explored but are presented in this paper. A total of 21 experiments have been conducted to demonstrate their merits in terms of higher anchor strengths and minimizing the impacts of the extending bond length over the embedded spike, bend radius and FRP-concrete bond. Experimental results also suggest a great remedy to further improve the anchor efficiency by reducing the fanning angle. Thus, the proposed system could be considered as an efficient and feasible anchorage for FRP sheets.

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“…El estudio del comportamiento del arrancamiento de distintos tipos de anclajes en elementos de hormigón está ampliamente desarrollado [13], [14], sin embargo, a pesar de que existen trabajos que analizan experimentalmente el comportamiento de anclajes ante el arrancamiento a partir de ensayos realizados en especímenes de ladrillo [6], [15], apenas existen estudios que muestren resultados sobre fábricas reales de ladrillo. Existen trabajos de investigación en reparaciones de estructuras históricas de mampostería en piedra y roca [16], [17], que han realizado estudios de arrancamiento con anclajes por adherencia, pero no se han encontrado referencias del comportamiento de anclajes mecánicos con tacos plásticos.…”

Section: Motivaciónunclassified

Comportamiento a arrancamiento de anclajes plásticos en muros de fábrica de ladrillo

Rodrigo¹

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Pull-out and shear-strength models for FRP spike anchors

Cited by 46 publications

References 26 publications

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

An effective improvement for enhancing the strength and feasibility of FRP spike anchors

Comportamiento a arrancamiento de anclajes plásticos en muros de fábrica de ladrillo

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