Transcript Truck Pavement Interaction - Asphalt Research Consortium
Truck-Pavement Interaction Research Program Tire Study
International Workshop on the Use of Widebase Tires October 25-26, 2007 FHWA TFHRC 1
TTA C.4
Tire/Pavement Effects
Phase I Phase II Phase III Phase IV Dynamic Effects Pressure/Footprint/ANN Hot Weather Shear Accelerated Loading
Federal Highway Administration Truck Pavement Interaction 2
TTA C.4 (Cont.)
Phase II - Tire Pavement Interface
•
Pressure Patterns (TPIPP)
3D Tire Pressure Tests “South African Vehicle-Road Surface Pressure Transducer Array (VRSPTA)”
•
1D Tire Pressure Tests “Kistler MODULUS Quartz Sensor Array”
•
Artificial Neural Network model for bias and radial tires (ANN) Federal Highway Administration Truck Pavement Interaction 3
TTA C.4 (Cont.) Phase II - TPIPP
3D Tire Pressure Print Tests
Tire Type G(10.00x20) Bias Ply G159A(11R22.5) BF Goodrich Aircraft G159A(295/75R22.5) G286(425/65R22.5) G178(385/65R22.5) Load Range kN (% of rated) 26-56 (60-200) 26-56 (61-206) 26-156 (13-78) 26-41 (59-139) 26-106 (46-230) 30-50 (82-137) Inflation Pressure Range kPa (% of rated) 220-920 (32-148) 220-920 (32-148) 1040 (67) 420-820 (61-119) 500-1000 (71-143) 500-1000 (71-143) Federal Highway Administration Truck Pavement Interaction 4
TTA C.4 (Cont.) Phase II - TPIPP
ANN Tire Model
Tire Type G(10.00x20) Bias Ply G159A(11R22.5) Load Range kN (% of rated) 26-56 (60-200) 26-56 (61-206) Inflation Pressure Range kPa (% of rated) 220-920 (32-148) 220-920 (32-148) Federal Highway Administration Truck Pavement Interaction 5
TTA C.4 (Cont.) Phase II - TPIPP 3D VRSPTA Measurement 3D ANN Model Prediction Federal Highway Administration Truck Pavement Interaction 6
TTA C.4 (Cont.) Phase II - TPIPP
1D Tire Pressure Print Tests
Tire Type Load Range Inflation Pressure Range kN (% of rated) kPa (% of rated) G159A(295/75R22.5) 9-35 (35-139) G286(425/65R22.5) 9-60 (20-138) MXZA2(275/80R22.5) 9-62(19-135) MXDA(495/45R22.5) 9-35(35-139) 420-827 (61-120) 482-1000 (70-145) 482-1000 (70-145) 420-827 (61-120) Federal Highway Administration Truck Pavement Interaction 7
Michelin 495/45R22.5 Wide Base Tire
Inflation Pressure: 1000 kPa Applied Vertical Load: 62 kN Temperature : 16 ºC Test Vehicle Speed: 1.1 m/s Max Stress: 1.666 MPa 1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1 13 17 21 25 29 9 5
Transverse (Sensor No.)
1.6-1.8
1.4-1.6
1.2-1.4
1-1.2
0.8-1 0.6-0.8
0.4-0.6
Longitudinal (mm) Federal Highway Administration Truck Pavement Interaction 8
TTA C.4 (Cont.)
• • • •
Phase III - Hot Weather Shear – LTPP SPS-8 Ohio Test Road
Two Asphalt Concrete thicknesses Unique instrumentation of embedded gages to measure vertical shear and temperature with depth Three speeds, three tire inflation pressures, dual and wide-base tires FHWA Test Truck measures Road Profile and Dynamic Wheel Forces Federal Highway Administration Truck Pavement Interaction 9
Federal Highway Administration Truck Pavement Interaction 10
Ohio SHRP LTPP SPS-1, 2 & 8
JPCP AC 8” 4” WHOH!
WHOH!
WHOH!
WHOH!
Federal Highway Administration Truck Pavement Interaction
N
11
Strain Gage Rosette Configuration on Square Holes
Federal Highway Administration Truck Pavement Interaction 12
Test Run Series
Wide Base (G286 & MXDA) Test Series Speed (mph) Tire Inflation Pressure (psi) 1 2 3 4 5 6 7 8 9 5 25 55 5 25 55 5 25 55 70 70 70 100 100 100 120 120 120 Dual (G159 & MXZA2) Test Series Speed (mph) Tire Inflation Pressure (psi) 10 11 12 13 14 15 16 17 18 5 25 55 5 25 55 5 25 55 70 70 70 100 100 100 120 120 120 Federal Highway Administration Truck Pavement Interaction 13
-600 -800 -1000 -1200 200 0 5 -200 -400 -1400 -1600 -1800 -2000
Goodyear Dual G159A(295/75R22.5), 1st Hole, Vertical, 8" AC, 120 psi, 5 mph, Lat. Dist. = 9", Temp@ 1",3.5",7" = 45.7,38.2 and 32.1 C
5.2
5.4
5.6
5.8
6 6.2
6.4
Top Bottom 6.6
Time (s) Federal Highway Administration Truck Pavement Interaction 14
Goodyear Dual G159 (295/75R22.5), 1st Hole, Horizontal 8" AC, 120 psi, 5 mph, Lat. Dist. = 9", Temp@ 1",3.5",7" = 45.7,38.2 and 32.1 C
-100 -150 -200 -250 250 200 150 100 50 0 5 -50 5.2
5.4
5.6
5.8
6 6.2
6.4
6.6
Top Bottom
Time (s) Federal Highway Administration Truck Pavement Interaction 15
Other Data and Tests…
• Weather Station • FWD • Surface Profile & Truck Dynamics • Material Characterization – Creep – Relaxation – Triangular Load
Federal Highway Administration Truck Pavement Interaction 16
TTA C.4
(Cont.)
TPI Tire Testing Status
Radial Tires * G(10 x 20) G159(11R22.5) ** G286(425/65R22.5) G159(295/75R22.5) G (385/65/R22.5) MXZA2(275/80R22.5) MXDA(495/45R22.5) MX(American) *** Phase I Dynamics Road X X X X Phase II Pressure Prints DYNTRAC 3D Tests 1D Tests X X X X X X X X X X Phase III Phase IV Hot Weather APT ANN Pvmnt Shear Flex/Flex OL X X X X o o X X o o o Planned * Except G(10x20) X Completed Test ** On FHWA Test Truck in Ohio *** Not Yet Received Federal Highway Administration Truck Pavement Interaction 17
TTA C.4 (Cont.) Phase IV - Accelerated Loading
Test Tires:
Goodyear Dual Goodyear S.S. Michelin Dual Michelin S.S.
G159A(295/75R22.5) G286(425/65R22.5) MXZA2(275/80R22.5) MXDA(495/45R22.5)
* * Prototype
Federal Highway Administration Truck Pavement Interaction 18
TTA C.4 (Cont.) Phase IV - Accelerated Loading
Test Matrix
Wander AC Thickness Rutting Bell to be specified 3"-4" Temperature 50 C Failure Criteria 0.5"-0.75" Load Tire Pressure Speed Traffic 40 kN (9000 lb.) 2.24 m/s (5 mph) One way Fatigue Bell to be specified 3"-4" 50 F 50% Cracking (VESYS) 40 kN (9000 lb.) Manufacturer Rated Manufacturer Rated 2.24 m/s (5 mph) One way Federal Highway Administration Truck Pavement Interaction 19