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

Details

• Creators:
  Yu, Hailing ; Jeong, David Y.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Subject/TRT Terms:
  Bonding Concrete Ties Elasticity (Mechanics) Failure Analysis Finite Element Method Prestressed Concrete Ties Railroad Ties Structural Analysis Wire
• Resource Type:
  In Proceedings
• Geographical Coverage:
  United States
• Corporate Publisher:
  American Society of Civil Engineers
• 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
  
  plant.
  
  
• Format:
  PDF
• Funding:
  RR19A2
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha-512:873f3a5165b975cf5e6588bf7415abe720b67e05124ad82fc9d259154c1c154a13213e6473abc2a35707a4eb57848a1b11d80961044863dd8cf76014ba41f265
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/12177/dot_12177_DS1.pdf
• File Type:
  [PDF - 266.21 KB ]