# Technical

May 1, 2010 by NSC2 in Advisory Desk, Technical

There are eight possible combinations that might occur. They may be expressed as follows:

• LC1: 1.4D + 1.6V
• LC2: 1.4D + 1.6H
• LC3: 1.4D + 1.4V + 1.4H
• LC4: 1.2D + 1.4I + 1.4V
• LC5: 1.2D + 1.2I + 1.2H
• LC6: 1.2D + 1.2I + 1.4V + 1.2H
• LC7: 1.2D + 1.2W + 1.2V + 1.2H
• LC8: 1.2D + 1.2I + 1.2W + 1.2V + 1.2H

Where:

• I  is the imposed load
• W is the wind load
• V  is the vertical crane load (i.e. dynamic vertical wheel loads: which is self-weight of the crane plus the lifted load and the allowance for dynamic effects)
• H  is the horizontal crane load

All the above load factors have been taken from Table 2 of BS 5950-1:2000 (amended 2007). The relevant ‘type of load’ and associated load factor for each of these combinations is as follows:

Explanation for LC1 and LC2:

• “Vertical crane loads” = 1.6
• “Horizontal crane loads” = 1.6

Explanation for LC3:

• “Vertical crane loads acting together with horizontal crane loads” = 1.4
• “Horizontal crane loads acting together with vertical crane loads” = 1.4

Explanation for LC4:

Explanation for LC5 and LC6:

Explanation for LC7 and LC8: