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Section 5
5-179
reference point
z
x
d2
W
d1
x
z
W
d2
d1
reference point
Movement parallel to global X axis Movement parallel to global Z axis
Figure 5.22
Notice that in the left view, the reference point is on the positive Z
wheel track side; whereas in the right view, the reference point is
on the least positive X wheel track side.
Specifying standard AASHTO loadings
General format:
⎧HS20 ⎫
See Section
1.17.1
TYP
E i ⎨HS15 ⎬ ( f ) ( vs )
⎪H20 ⎪
⎩
H15
⎭
where,
i = moving load system type no. (integer).
f = optional multiplying factor (default = 1.0)
vs = variable spacing as defined by AASHTO, for HS series
trucks (default = 14 ft.)