Finite Element Bond Modeling for Indented Wires in Pretensioned Concrete Crossties

Details

• Creators:
  Yu, Hailing ; Jeong, David Y.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Subject/TRT Terms:
  • Finite element method
  • Prestressed concrete ties
  • Wire
  • Railroad ties
  • Concrete ties
  • Mathematical models
• Publication/ Report Number:
  JRC2016-5782
• Resource Type:
  Research Paper
• Geographical Coverage:
  United States
• Corporate Publisher:
  American Society of Mechanical Engineers
• 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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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/12285/dot_12285_DS1.pdf
• File Type:
  [PDF - 399.72 KB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha-512:645ea1e6b555107e748ce78547dd81e9c7ffd71e8b5a4243818dc866ee1d48bedc25368681d0be4cc6d6e95f4c7ee3f41e73d7aa3d6f0b32faa5ebb5adae43d0