In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: CRC #54: DEVELOPMENT OF ANCHORAGE SYSTEM FOR FRP STRENGTHENING APPLICATIONS USING INTEGRATED FRP COMPOSITE ANCHORS
Appears on pages(s):
Keywords: composite, anchors, frp
Abstract:Over the past three decades the use of externally bonded fiber-reinforced polymer (FRP) materials for structural strengthening applications has become an accepted and widely used method. A primary concern of FRP structural strengthening systems is that FRP sheets may debond from the concrete surface at a force significantly lower than the strength of the FRP material. Debonding failures are often brittle and occur with little warning, therefore making them an undesirable failure mode. Past research studies have concluded that fastening FRP sheets with FRP anchors is an effective method for delaying or preventing debonding failures. There is, however, scarcity of research pertaining to fastening FRP sheets with FRP anchors, and a corresponding lack of design guidance. The primary objective of this research program was to better understand the behavior of bonded FRP sheets that include FRP anchors as a supplemental system to prevent debonding. The outcome of this research project will provide data for future development of design recommendations of this type of anchorage system of FRP sheets.
This report concentrates on carbon fiber unidirectional sheets applied using a wet layup approach. Test variables that were investigated include: type of the FRP sheet by including two different FRP material manufacturers, bonded sheets without supplemental FRP anchors, bonded sheets with supplemental FRP anchors, number of anchor rows and spacing between rows, number of sheet plies (single or double), and length of bonded sheet behind the anchors.
Sixteen laboratory specimens were fabricated and tested. Experimental results show that FRP anchorage systems are very effective in increasing load capacity by delaying debonding. Finite element models of anchored and unanchored FRP sheets were developed to provide a methodology that can be used to expand the laboratory results to elements where anchors are applied using other configurations. In combination with the laboratory results, the finite element models provided a better understanding of the stress distribution within the FRP sheet as affected by the presence of FRP anchors.
View Resource »