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: Long-Term Multipliers and Deformability of Fiber- Reinforced Polymer Prestressed Concrete
Author(s): Yail J. Kim and Raymon W. Nickle
Publication: Structural Journal
Appears on pages(s): 223-234
Keywords: bridge; deformability; fiber-reinforced polymer (FRP); longterm multiplier; minimum reinforcement; prestress
Abstract:This paper presents the flexural characteristics of highway bridge girders prestressed with fiber-reinforced polymer (FRP) tendons. Of interest are the technical challenges identified by ACI Subcommittee 440-I (FRP-Prestressed Concrete): long-term multipliers, deformability, and minimum reinforcement. Aramid and carbon FRP (AFRP and CFRP, respectively) composites are used to prestress concrete girders. Based on analytical models, new design expressions are proposed for the aforementioned items, followed by an assessment using laboratory test data and full-scale benchmark bridges. The long-term multipliers calibrated per reliability theory are mostly different from the empirical multipliers adopted in ACI 440.4R-04. The girders prestressed with AFRP/CFRP sufficiently deform in flexure, even though their moment-curvature responses are not comparable with those of steel-prestressed girders. The new deformability index specifies design requirements for AFRP/CFRP-prestressed members with either compression-controlled or tensioned-controlled sections. The importance of a potential change in FRP modulus during the service life of prestressed concrete girders is examined. A factored ultimate-tocracking moment ratio of ϕMn/Mcr = 1.2 is suggested for girders prestressed with AFRP/CFRP, which aligns with the articles of existing design manuals and specifications dedicated to prestressed concrete.
Click here to become an online Journal subscriber