special conditions, a dynamic coefficient of 2.0 may be used, offlead and wind forces may be taken as zero, and
sideload shall be taken as 2 % of the vertical factored load (sideload force = 0.02 × FL). If this method is used, the
minimum hook speed (Vhmin) shall not be less than 0.67 ft/s (40 ft/min).
5.4.5 Vertical Factored Loads
5.4.5.1 General
The vertical factored load FL acting on the crane boom tip shall be the SWLH multiplied by the vertical dynamic
coefficient Cv.
(1)
5.4.5.2 Offboard Lifts
For offboard lifts, the vertical dynamic coefficient Cv shall be determined from the following expression:
(2)
NOTE See first column in Table 2 for definition of variables.
Figure 3—Onboard Loadings
1
2
3
7
8
5 6
9
4
Key
1 centerline of crane
2 vertical axis
3 crane inclination
4 K & I (in any direction)
5 F
6 G & H
7 crane weight
8 J
9 D
FL = Cv × SWLH
Cv 1 Vr
K
g × SWLH