Details:

Creators:
Yu, Hailing ; Jeong, David Y.
Yu, Hailing ; Jeong, David Y. Less -
Corporate Creators:
John A. Volpe National Transportation Systems Center (U.S.)
Subject/TRT Terms:
[+]
Concrete Ties Finite Element Method Mathematical Models Prestressed Concrete Ties Railroad Ties Wire
Publication/ Report Number:
JRC2016-5782
Resource Type:
Research Paper
Geographical Coverage:
United States
Corporate Publisher:
American Society of Mechanical Engineers
NTL Classification:
AGR-INFRASTRUCTURE-Railroads;AGR-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;NTL-RAIL TRANSPORTATION-Rail Safety;
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.


Format:
PDF
Collection(s):
Volpe
Main Document Checksum:
[+]
urn:sha256:d4c0b99defd29c06bb0ae9de99e37b02cddd8d91fc45ecb3e5ce2ddf496b901d
Download URL:
https://rosap.ntl.bts.gov/view/dot/12285/dot_12285_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +