Huawei Y360-U03 Faq page 14

Rigid Pavement Design Example
Given:
Pavement of choice:
•
Subbase:
•
Shoulders:
•
Number of Lanes:
•
Functional Classification:
•
2018 Traffic:
•
2038 Traffic:
•
24 hour truck %:
•
Design Period:
•
Open to Traffic:
•
Subgrade CBR:
•
Problem:
Solution:
Step 1 - Determine the 18-kip equivalent single axle loading (ESAL).
Since the project is expected to open to traffic in 2019, the ESAL projection should be for 2019 to 2039.
Calculate the mid-year (2029) ADT, rounded to nearest ten:
2029 ADT = 15,800+(22,450-15,800)(11/20)
2029 ADT = 19,460
The equations in Section 202.2 are used with
Directional distribution, D = 50% (Figure 202-1)
Lane factor = 95% (Figure 202-1)
B:C ratio = 5:1 (Figure 202-1)
ESAL conversion factor for B trucks = 1.67 (Figure 202-1)
ESAL conversion factor for C trucks = 0.44 (Figure 202-1)
Using the equations given in Section 202.2:
ESAL's from B trucks = 19,460(0.18)(0.50)(0.95)(5/6)(1.67) = 2,315
ESAL's from C trucks = 19,460(0.18)(0.50)(0.95)(1/6)(0.44) = 122
Total daily ESAL's = 2,315+122 = 2,437 ESAL/day
Design period ESAL's = 2,437 ESAL/day * 365.25 days/yr. * 20 years = 17,802,285
Page 1
Doweled, jointed concrete
6 inches Item 304 Aggregate Base
Tied, jointed, concrete
4 (2 per direction)
Principal Arterial (Rural)
15,800 ADT
22,450 ADT
18%
20 years
2019
5 (from GB1 analysis)
Solve for the thickness of the concrete slab.
302-1
July 2016
Reference Section
302
6
use 17.8x10 ESAL's