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Development of an Analytical Tool for
Track Component Response (I-TRACK)
Thiago B. do Carmo, J. Riley Edwards, Ryan G. Kernes
UIUC FRA Tie and Fastener BAA - Industry Partners Meeting
Incline Village, NV
7 October 2013
Slide 2Simplified Analytical Tool and Parametric Analysis
Outline• Objectives
• Background
• Analytical Tool
- Project Phases
- Input and Output Parameters
- Features
- Software Presentation
- Validation of Results
• Vision / Future Work
Slide 3Simplified Analytical Tool and Parametric Analysis
Mechanistic Design
Framework
Literature Review
Load Path Analysis
International Standards
Current Industry Practices
AREMA Chapter 30
Finite Element Model
Laboratory Experimentation
Field Experimentation
Parametric Analyses
Overall Project Deliverables
I – TRACK
Statistical Analysis
from FEM
Free Body Diagram
Analysis
Probabilistic Loading
Slide 4Simplified Analytical Tool and Parametric Analysis
Objectives
FE Model Spreadsheet
• Efficiently estimate track system and component response using
mechanistic design
• Develop a tool to analyze the crosstie and fastening system
components based on the finite element (FE) model results
(validated by lab and field data)
• Analyze the influence of input parameters on track behavior
• Provide a practical tool to assist a mechanistic design approach of
concrete crossties and fastening systems
Slide 5Simplified Analytical Tool and Parametric Analysis
Loading Environment
Slide 6Simplified Analytical Tool and Parametric Analysis
Introduction to Track Response Tool
I-TRACK
• Input and Output parameters were
prioritized for each project phase
• Design of Experiments (DOE) used to
reduce the number of model iterations
• Systematic variation of inputs results in
equations that describe the component
responses using multivariate regression
• I-TRACK composed of equations
derived from FE model, laboratory
experimentation, field experimentation,
and FBD analysis
Input
Parameters
Design of
Experiments
System
Outputs
FE Model
Multivariate
Regression
Simplified
Tool
Slide 7Simplified Analytical Tool and Parametric Analysis
Project Phases
• Project is divided in 3 phases, which add additional complexity
and design options
• Goal is to expedite the development process of the simplified tool
and test the accuracy and functionalities on a continuous basis
Version Input Capabilities Release Date
Load
Materials
Interface Interactions
Support Conditions
Geometry
Components Relative Position
v1.0
v2.0
v3.0
7 October 2013
Spring 2014
Summer 2014
Slide 8Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (v1.0)
Vertical Load
Lateral Load
Insulator Young’s
Modulus
Rail Pad Young’s
Modulus
Clip Young’s
Modulus
Track Vertical Deflection
Inputs Outputs
Track Lateral Deflection
Clamping Force (Gauge
and Field Side)
Clip Max Stress (Gauge
and Field Side)
Abrasion Frame
Lateral Translation
Rail Base Lateral
Translation
Rail Seat Load
Max Rail Seat
Pressure
Slide 9Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (v2.0)
Vertical Load
Lateral Load
Insulator Young’s
Modulus
Rail Pad Young’s
Modulus
Clip Young’s
Modulus
Track Vertical Deflection
Inputs Outputs
Track Lateral Deflection
Clamping Force (Gauge
and Field Side)
Clip Max Stress (Gauge
and Field Side)
Abrasion Frame
Lateral Translation
Rail Base Lateral
Translation
Rail Seat Load
Max Rail Seat
Pressure
Slide 10Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (cont. v2.0)
COF between rail seat
and abrasion frame
Inputs Outputs
COF between
insulator and shoulder
Concrete Compressive
Strength
Support Conditions
COF between rail and
rail pad
Max Rail Head Lateral
Deflection
Rail Base Rotation
Rail Pad Lateral
Translation
Clip Max Stress
Crosstie Max Stress:
Direction and
Location
Slide 11Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (v3.0)
Vertical Load
Lateral Load
Insulator Young’s
Modulus
Rail Pad Young’s
Modulus
Clip Young’s
Modulus
Track Vertical Deflection
Inputs Outputs
Track Lateral Deflection
Clamping Force (Gauge
and Field Side)
Clip Max Stress (Gauge
and Field Side)
Abrasion Frame
Lateral Translation
Rail Base Lateral
Translation
Rail Seat Load
Max Rail Seat
Pressure
Slide 12Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (cont. v3.0)
COF between rail seat
and abrasion frame
Inputs Outputs
COF between
insulator and shoulder
Concrete Compressive
Strength
Support Conditions
COF between rail and
rail pad
Max Rail Head Lateral
Deflection
Rail Base Rotation
Rail Pad Lateral
Translation
Clip Max Stress
Crosstie Max Stress:
Direction and
Location
Slide 13Simplified Analytical Tool and Parametric Analysis
Inputs and Outputs (cont. v3.0)
COF between rail seat
and abrasion frame
Inputs Outputs
COF between
insulator and shoulder
Concrete Compressive
Strength
Support Conditions
COF between rail and
rail pad
Max Rail Head Lateral
Deflection
Rail Base Rotation
Rail Pad Lateral
Translation
Clip Max Stress
Crosstie Max
Stress: Direction
and Location
Component Geometry
Slide 14Simplified Analytical Tool and Parametric Analysis
• User friendly interface that can be adapted to user’s level of
expertise in railroad engineering and track component design
• Initially software, potential for iPhone app and other platforms
• Tutorial explaining functionality and examples
• Database containing geometry and material properties of
standard components
• Broad list of outputs providing a framework to understand the
mechanistic behavior of components
• Prediction of possible failure modes
• Generation of printable reports
I-TRACK Features
Slide 15Simplified Analytical Tool and Parametric Analysis
Slide 16Simplified Analytical Tool and Parametric Analysis
I-TRACK Validation – Clamping Force
-3500
-3000
-2500
-2000
-1500
-1000
-500
0
1 2 3 4 5 6 7 8 9 10
Cla
mp
ing
Fo
rce F
ield
Sid
e (
lb)
Test Case
True Value
Model Value
Slide 17Simplified Analytical Tool and Parametric Analysis
Future Work
• Development of I-TRACK 2.0 and I-TRACK 3.0 (add surface
interactions, support conditions, and geometry as
spreadsheet inputs)
• Continue improving the accuracy of the spreadsheet by
running additional interactions on the FE model and refining
the equations
• Launch the simplified tool in different platforms: software,
phone app (IPhone and Android)
• Deliver final product Fall 2014
Slide 18Simplified Analytical Tool and Parametric Analysis
Acknowledgements
• Funding for this research has been provided by
– Federal Railroad Administration (FRA)
– National University Rail Center - NURail
• Industry Partnership and support has been provided by
– Union Pacific Railroad
– BNSF Railway
– National Railway Passenger Corporation (Amtrak)
– Amsted RPS / Amsted Rail, Inc.
– GIC Ingeniería y Construcción
– Hanson Professional Services, Inc.
– CXT Concrete Ties, Inc., LB Foster Company
– TTX Company
• For assisting with research and code development
– Ashish Khetan, George Chen, Brent Williams, Prof.
Shin, Brandon Van Dyk, Prof. Andrawes
FRA Tie and Fastener BAA
Industry Partners:
Slide 19Simplified Analytical Tool and Parametric Analysis
Thank you!
Questions?
Thiago Bizarria do Carmo
University of Illinois at Urbana-Champaign
Department of Civil and Environmental Engineering
Email: [email protected]