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:
  • Concrete ties
  • Prestressed concrete ties
  • Railroad ties
  • Finite element method
  • Structural analysis
  • Failure analysis
  • Wire
  • Elasticity (Mechanics)
  • Bonding
• 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.
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• Format:
  PDF
• Funding:
  RR19A2
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/12177/dot_12177_DS1.pdf
• File Type:
  [PDF - 266.21 KB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha-512:873f3a5165b975cf5e6588bf7415abe720b67e05124ad82fc9d259154c1c154a13213e6473abc2a35707a4eb57848a1b11d80961044863dd8cf76014ba41f265