Bond between smooth prestressing wires and concrete : finite element model and transfer length analysis for pretensioned concrete crossties.
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Bond between smooth prestressing wires and concrete : finite element model and transfer length analysis for pretensioned concrete crossties.

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    • Abstract:
      Pretensioned concrete ties are increasingly employed in railroad high speed

      and heavy haul applications. The bond between prestressing wires or strands and

      concrete plays an important role in determining the transfer length of pretensioned

      concrete members, but little research was done to characterize the transfer length in

      terms of steel reinforcement and concrete factors for railroad concrete ties. Federal

      Railroad Administration is sponsoring a comprehensive test program at Kansas State

      University (KSU) aimed at quantitatively correlating prestressing steel and concrete

      variables with the transfer length of pretensioned concrete crossties, and Volpe Center

      has been applying the data obtained in the KSU test program to develop bond models

      that can be used in transfer length prediction and failure analysis of concrete ties.

      This paper describes finite element (FE) model development related to the

      smooth prestressing wire whose dominant bonding mechanisms with concrete are

      chemical adhesion and friction. The commercial FE software Abaqus is employed,

      and the steel-concrete interface is discretized with cohesive elements. A user bond

      model is developed within the elastoplastic framework and implemented for

      axisymmetric and 3D cohesive elements. The bond model defines constitutive

      relations in terms of normal and shear stresses vs. interfacial dilation and slips. The

      bond behavior is initially linear elastic, followed by adhesion and friction that are

      governed by a yield function and a plastic flow rule specific for the smooth wireconcrete

      interface. The main bond material parameters are normal and shear elastic

      stiffness, initial adhesive strength, plastic slip at which adhesion first breaks

      completely, and coefficient of friction. Except for the coefficient of friction, which is

      determined with reference to the open literature, the bond parameters are calibrated

      from untensioned pullout tests and pretensioned prism tests conducted at KSU. The

      calibrated bond parameters exhibit a dependence on the nominal compressive strength

      of concrete at the time of pretension release. Because considerable concrete creeping

      has been observed in the periods between pretension release and concrete strain

      measurement in the test program, an additional concrete material parameter, basic

      creep compliance, can be calculated and applied to adjust the concrete surface strain

      data. The user bond model is then validated with transfer length data measured on

      actual concrete crossties made with a smooth prestressing wire in a tie manufacturing


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