Finite Element Bond Modeling for Indented Wires in Pretensioned Concrete Crossties
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Finite Element Bond Modeling for Indented Wires in Pretensioned Concrete Crossties

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  • Abstract:
    Indented wires have been increasingly employed by

    concrete crosstie manufacturers to improve the bond between

    prestressing steel reinforcements and concrete, as bond can

    affect several critical performance measures, including transfer

    length, splitting propensity and flexural moment capacity of

    concrete ties. While extensive experimental testing has been

    conducted at Kansas State University (KSU) to obtain bond

    characteristics of about a dozen commonly used prestressing

    wires, this paper develops macro-scale or phenomenological

    finite element bond models for three typical wires with spiral or

    chevron indent patterns. The steel wire-concrete interface is

    homogenized and represented with a thin layer of cohesive

    elements sandwiched between steel and concrete elements. The

    cohesive elements are assigned traction-displacement

    constitutive or bond relations that are defined in terms of normal

    and shear stresses versus interfacial dilatation and slip within the

    elasto-plastic framework. A yield function expressed in

    quadratic form of shear stress and linear form of normal stress is

    adopted. The yield function takes into account the adhesive

    mechanism and hardens in the post-adhesive stage. The plastic

    flow rule is defined such that the plastic dilatation evolves with

    the plastic slip. The mathematical forms of the yield and plastic

    flow functions are the same for all three wire types, but the bond

    parameters are specific for each wire. The adhesive, hardening

    and dilatational bond parameters are determined for each wire

    type based on untensioned pullout tests and pretensioned prism

    tests conducted at KSU. Simulation results using these bond

    models are further verified with surface strain data measured on

    actual concrete crossties made with the three respective

    prestressing wires at a tie manufacturing plant.

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