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Lecture 21 Slides

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Rigid Airport Pavement
Design
Design Aircraft and
Annual Departures
Conversions for Different Gear Types
Conversions for Different Wheel Loads
Example
Aircraft
Gear Type
Average
Annual
Departures
Max Takeoff
Weight
(lbs.)
727-100
dual
3,760
160,000
727-200
dual
9,080
190,500
707-320B
dual tandem
3,050
327,000
DC-9-30
dual
5,800
108,000
CV-880
dual tandem
400
184,500
737-200
dual
2,650
115,500
L-1011-100
dual tandem
1,710
450,000
747-100
double dual tandem
85
700,000
Determine Design Aircraft
Aircraft
Gear Type
Average
Annual
Departures
Max Takeoff
Weight
(lbs.)
727-100
dual
3,760
160,000
727-200
dual
9,080
190,500
707-320B
dual tandem
3,050
327,000
DC-9-30
dual
5,800
108,000
CV-880
dual tandem
400
184,500
737-200
dual
2,650
115,500
L-1011-100
dual tandem
1,710
450,000
747-100
double dual tandem
85
700,000
Adjust Departures for Gear Type
Aircraft
Gear Type
Average
Annual
Departures
Gear
Type
Multiplier
Equivalent
Dual Wheel
Departures
727-100
dual
3,760
1.0
3,760
727-200
dual
9,080
1.0
9,080
707-320B
dual tandem
3,050
1.7
5,185
DC-9-30
dual
5,800
1.0
5,800
CV-880
dual tandem
400
1.7
680
737-200
dual
2,650
1.0
2,650
L-1011-100
dual tandem
1,710
1.7
2,907
747-100
double dual tandem
85
1.7
145
Determine Equivalent Dual Wheel Loads
Aircraft
Gear Type
Max Takeoff
Weight
(lbs.)
Weight on
Main Gear
(lbs)
Wheel
Load
(lbs)
727-100
dual
160,000
152,000
38,000
727-200
dual
190,500
180,975
45,240
707-320B
dual tandem
327,000
310,650
38,830
DC-9-30
dual
108,000
102,600
25,650
CV-880
dual tandem
184,500
175,275
21,910
737-200
dual
115,500
109,725
27,430
L-1011-100
dual tandem
450,000
285,000
35,625
747-100
double dual tandem
700,000
285,000
35,625
Adjust Departures for Wheel Loads
Equivalent
Dual Gear
Departures
Wheel Load
(lbs)
Wheel Load of
Design Aircraft
(lbs.)
Equivalent Annual
Departures of
Design Aircraft
727-100
3,760
38,000
45,240
1,891
727-200
9,080
45,240
45,240
9,080
707-320B
5,185
38,830
45,240
2,764
DC-9-30
5,800
25,650
45,240
682
CV-880
680
21,910
45,240
94
737-200
2,650
27,430
45,240
463
L-1011-100
2,907
35,625
45,240
1,184
145
35,625
45,240
83
TOTAL
16,241
Aircraft
747-100
Example (cont.)
Assumed
Material Properties
keff = 200 psi/in
Sc = 650 psi
Typical Pavement Sections
Acceptable Subbase Materials
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Item P-154 ~ Subbase Course
Item P-208 ~ Aggregate Base Course
Item P-209 ~ Crushed Aggregate Base Course
Item P-211 ~ Lime Rock Base Course
Item P-304 ~ Cement Treated Base Course
Item P-306 ~ Econocrete Subbase Course
Item P-401 ~ Plant Mix Bituminous Concrete
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