dr. robert peterman kansas state university department of civil … · 2018. 2. 27. · kansas...
TRANSCRIPT
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Dr. Robert Peterman
Kansas State University
Department of Civil Engineering
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Dr. Robert Peterman KSU Dept. of Civil Engineering
Dr. Kyle Riding KSU Dept. of Civil Engineering
Dr. Terry Beck KSU Dept. of Mechanical Engineering
Dr. John Wu KSU Dept. of Industrial Engineering
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RailroadsConcrete Tie
Producers
Prestressing Steel
SuppliersOther
Amtrak GIC DW Davis Wire PCI
BNSF Koppers KSA HSM
CSX LBFoster CXT Insteel
KCS voestalpine Nortrak Nucor-LMP
Rail.One WMC
Rocla
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Obtaining Ties
Non-Destructive Testing
Destructive Testing
Feedback
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Ties in service and performed well for 25 Years
Ties that have failed in track
Ties that have signs of distress in service.
Compare with current tie designs
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In May 2015, KSU team members Bob Peterman and Kyle Riding, along with project partners Steve Mattson (Nortrak) and Rusty Croley (Rocla) selected over 100 ties from the TTCI tie boneyard in Pueblo Colorado to be shipped to Manhattan, KS for detailed analysis.
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Six (6) matching ties representing major design types that were commonly used by Class 1 railroads since the 1970’s were selected and marked for shipment
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Two semi-trailer loads of ties were shipped to the USDA ARS Lab in Manhattan Kansas in July 2015 where the initial visual inspection and 3D scanning is being conducted.
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In addition to the ties from TTCI, KSU is receiving old ties from our railroad partners (Amtrak, BNSF, CSX, and Kansas City Southern) as well as new ties from our tie producer partners.
If any of you are aware of additional ties that we should include in this study please contact us.
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Systematic Photographic Documentation
Measurement of End-Slippage when possible
Visual Inspection and Damage or Wear Assessment (Mapping of Cracks, etc.)
Non-Contact 3-Dimensional Scanning
Non-Destructive Evaluation of Ties:
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Camera Positions for Crosstie Photo Captures
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3D Optical Scanning of Ties
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3D Scanning of Existing Crossties
Determine Section Properties along Length of Tie
Cross-Section Parameter Evaluation (Area, Neutral Axis, Area Moment of Inertia, Eccentricity, etc.
Determine Section Propertiesalong the Length of Tie:
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Detailed Variation
with Distance, x
along Tie
3D CAD Model
Neutral Axish
a
b
ys
e
A(x)
C
Extraction of Crosstie Geometrical Parameters
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0 20 400
0.2
0.4
0.6
0.8
1
0
r x( )
510 x
in
Position along Crosstie, x(in)
Nor
mal
ized
Sha
pe F
acto
r, R(
x)/R
0
R0 = 0.0204 in-2
Normalized Shape Factor for Crosstie
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Impact Echo
Ultrasonic Pulse Velocity
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• Ultrasonic pulse velocity• Micro-cracking slows
wave propagation in concrete
• Measurements taken at different locations in the ties to measure deterioration at different locations
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Support tie upside-at rail seat and load at center until cracking.
Unload tie and apply instrumentation across crack.
Re-load and establish the crack-opening load
Calculate the prestress force from statics (knowing the detailed geometry and cross-section)
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P
Modified Center Negative Loading Test
P Py e
Required Parameters: A, I, y, and e
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Modified Center Negative Loading Test
P Py e
Required Parameters: A, I, y, and e
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P
Modified Center Negative Loading Test
At Crack Initiation:
P Py e
Required Parameters: A, I, y, and e
0P Pey My
A I I
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0
5,000
10,000
15,000
20,000
25,000
0.0000 0.0010 0.0020 0.0030 0.0040
Applied L
oa (Pounds)
Difference between crack LVDT and non-crack LVDT (Inches)
Tie B-2
Crack Opening Load = 9780 Pounds
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Determination of Remaining Prestress Force in Tie B-2
B-2
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Determination of Remaining Prestress Force in Tie E-4
Crack Load = 12630 lbs
M = 142087.5 lb-in
y = 3.4 in
A = 62 in2
I = 225 in4
e = 0.21 in
P = 111235 lb
P = 111.2 kip
𝑷 =𝑴𝒚𝑨
𝑰 + 𝑨𝒆𝒚
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Center Negative Test (C-) Center Positive Test (C+)
Rail Seat Negative Test (RS-) Rail Seat Positive Test (RS+)
Crosstie Loading Tests
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◦ Unit weight
◦ Concrete compressive strength
◦ Concrete tensile strength
◦ Abrasion testing – correlate to aggregate hardness
◦ Aggregate hardness (Moh’s)
◦ Characterize aggregate mineralogy
◦ Determination of Presence of alkali-silica reaction
◦ Fracture Toughness
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◦ Hardened air void analysis
◦ Abrasion testing
◦ Alkali-silica reaction examination
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Fracture
toughness
crack size
time to
failure
Resistance
to failure
resistance
to crack
growth
47
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L > 3D + 2 in
D
N<0.02D
a0
3D (±5%)
Load Application
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◦ Acid cleaning of the different reinforcement types using the methodology developed in the current FRA project
◦ Close-up photo documentation of reinforcement types and indents
◦ Physical measurements according to ASTM A881 and automated scanner
◦ Conduct un-tensioned pullout tests according to ASTM A1096 (on wires only)
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