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OCR for page 13
13
25
Vehicle class 4
Axle Load Distribution (%)
20 Vehicle class 5
Vehicle class 6
15
Vehicle class 7
10
5
0
0 10000 20000 30000 40000 50000
Axle Load (lb)
Figure 7. Annual normalized single axle load distribution for
vehicle class 4 to 7 (LTPP Section 180901 in 2004).
Weight Tables in which WIM data are typically reported for axles, and each axle has single or dual tires. Table 7 lists the
vehicle classes 4, 5, 6, and 7 for LTPP test section 180901 in number of axles for each axle type and vehicle class.
2004. Figure 7 shows the annual normalized single axle load All axles of vehicle classes 4 and 5 and single axles of class
distribution calculated using the data in Table 6. 6 and 7 vehicles have single tires while the others have dual
tires. Thus the matrix of vehicle class and axle types can be
categorized according to the number of tires. When the steer-
Categorizing Traffic Load
ing and non-steering axles are put together in the single axle
In this study, the traffic loads were categorized based on the type, the matrix can be characterized into eight categories
vehicle class, axle type, and number of tires to facilitate the based on the vehicle class, the axle type, and the number of
analysis of load effects for reflection cracking. Every truck in tires. The total number of axle loads for each category was
each vehicle class has single, tandem, tridem, or/and quadrem used to determine the axle load distribution factor for the
Table 7. Number of axles for each vehicle class.
Number of Axles
Vehicle Class
Single* Tandem Tridem Quadrem
4 1 1
5 2 (1)
6 1 1
7 1 1
8 3 (2)
9 1 2
10 1 1 1
11 5 (4)
12 4 (3) 1
13 3 (2) 2
The number of nonsteering single axles are shown in parentheses.
Shaded areas are vehicle classes that use single tires; unshaded areas are vehicle classes that use dual tires.
