HomeMy WebLinkAbout85 - Design Report - Westgate Addition - Pavement PAVEMENT DESIGN - WESTGATE ADDITION
Use: Asphalt Institute "Thickness Design"
STEP l :
Determine the Design Traffic No . - DTN
Estimate of ADT Expected During First Year
Consider 8 Dwelling First Year
8 building x 4its x 6 trips = 192 ADT
bld
g g' y
STEP 2 :
Estimate of % of Heavy Trucks
For City Street (5%) % Heavy Trucks Table III-1 Thickness
Design Manual
Percent of Trucks in Design Lane - 50%
# of Heavy Trucks Expected in Design Lane
IDT x A B
100 x 100
of Heavy Trucks - 200 ADT x 5 1 x 150 5
STEP 3 :
Average Gross Weight of Heavy Trucks = 36 , 000#
Single Axle Load Limit - 20 , 000#
Refer to Figure III-1 "Traffic Analysis Chart" (attached)
Initial Traffic Number = 4 - Light Traffic
ITN Adjustment factor -
Design Period Years - 20
Use Annual Growth Rate - 4% (conservative)
Adjustment Factor - 1 . 49
1 . 49 x 4 = 5 . 96 use 6 - Design Traffic Number
Refer to Figure V-2 - Thickness Design Chart for Asphalt Pavement
Structures Using Subgrade Soil Resistance
Value
Resistance Values for Bozeman Clay Silt Loam_
Huffine Clay Loam
Range - 12-15 Earth Consultants , Bellevue , Washington
Pick Conservative Value - Use 12
Asphalt Section:
Total Structure Thickness Use 9"
Minimum Asphalt Section - Asphalt Institute
411
,
Use : 6" - Asphalt
6" - High quality gravel
Page 41 - For high quality untreated granular base - 2" gravel/inch
pavement
Only a limited portion of the full depth asphalt may be converted
to untreated granular base .
Refer to Figure B-1- Minimum thickness of asphalt pavement layers
over untested granular base . Use :. 5 . 8 inches
Max ADT - 21 x 4 x 6 = 504 ADT
(lots) units trips
(bldg ) ( day )
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