Effects of Rolling

Effects of Rolling

The effects of rolling are two part;
Firstly they increase the Lift radius in the same fashion as described under 'Effects of Heel'.
Secondly they accelerate and decelerate the Gib head and thereby the Lift weight, as well as the main structure itself. All of which adds up to increased load on the crane. Considering the effect of the lift weight only

For example a max heel angle of 10o, radius of gyration 40m and a period of oscillation of 6s would cause acceleration of the head of about 0.4g increasing load due to weight by 2.5 to 3.5% dependent on Boom Angle
This effect increases with increase boom length and boom angle and worsening weather condition
The effect of this will be rapid transients in the indicated load on the computer; the effect of increased radius of lift would not be accounted for. In such conditions Overload may occur and proper planning including a reduction in the Lift capacity should be made.