Tensile Capacity of U-bar Loop Connections with Precast Fiber Reinforced Dowels

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    Abstract

    This paper describes an investigation of the tensile capacity of in-situ cast U-bar loop connections between precast concrete elements. The basic idea is to introduce a small precast cylindrical dowel of fiber reinforced mortar that fits into the bend diameter of the overlapping U-bars. The remaining part of the connection is cast in-situ with a regular mortar, which then encapsulates the precast dowel. Different dowel configurations have been investigated, including the use of steel or synthetic fibers with or without lacer bars placed within the precast dowel.
    The experimental results show that use of a precast fiber reinforced dowel performs at a slightly lower load level, as compared to a connection grouted solely with regular mortar and reinforced with the same amount of transverse reinforcement. However, the load-displacement response of specimens with a fiber reinforced dowel is closer to ideal ductile behavior than that of the specimens grouted with regular mortar. The experimental results of the tensile tests are compared with calculations based on an upper bound plasticity model and satisfactory agreement has been obtained.
    Original languageEnglish
    Title of host publicationfib Symposium 2016: Performance-based approaches for concrete structures : Proceedings
    Number of pages11
    Publication date2016
    Publication statusPublished - 2016
    Eventfib Symposium 2016: Performance-based approaches for concrete structures - Cape Town, South Africa
    Duration: 21 Nov 201623 Nov 2016

    Conference

    Conferencefib Symposium 2016
    Country/TerritorySouth Africa
    CityCape Town
    Period21/11/201623/11/2016

    Keywords

    • Loop Connections
    • Tensile Capacity
    • Fiber Reinforced Concrete
    • Upper Bound Method

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