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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  • English

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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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