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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.
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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: Moment Redistribution in Continuous Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Beams
Author(s): Maria Antonietta Aiello and Luciano Ombres
Publication: Structural Journal
Appears on pages(s): 158-166
Keywords: continuous beams; fiber-reinforced polymer; moment redistribution; reinforced concrete
Abstract:The analysis of continuous reinforced concrete (RC) beams strengthened by externally bonded fiber-reinforced polymer (FRP) sheets is still an interesting research field that requires further investigation. Some recent studies carried out on this topic proved the possibility of achieving a certain degree of stress redistribution by using a proper design approach for strengthening—namely, the appropriate choice of the FRP reinforcement configuration and an appropriate reinforcement anchorage, aiming to eliminate or at least delay the occurrence of premature failures. In this paper, the structural behavior of RC continuous beams externally strengthened by FRP laminates is investigated from both an experimental and a theoretical point of view. In particular, the analysis of moment redistribution is addressed; the main items are related to the influence of the strengthening configuration and the evaluation of moment redistribution, not only at ultimate but also throughout the entire loading process. To this end, tests on six FRP-strengthened RC continuous beams subjected to a single point load at each span were performed and the results are discussed. In addition, a theoretical nonlinear model is proposed— taking into account bond characteristics and concrete cracking— to get a deeper understanding of the structural behavior both at ultimate and at the service conditions. The good agreement between the theoretical predictions and experimental results shows the effectiveness of the proposed model and its possible use for assessing design relationships.
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