igdelimb (Structural) (OP)
2 Feb 10 18:30
I am trying to find another reference to the crane impact loads. ASCE 7-05 Section 4.10 lists the following impact ratios for different type of cranes which is similar to AISC ASD 9th Edition Specifications for Structural Steel Buildings 1989.
ASCE 7-05 4.10.2 Vertical Impact Force. The maximum wheel loads of the crane shall be increased by the percentages shown in the following text to determine the induced vertical impact or vibration force:
a. Monorail cranes (powered) - 25%
b. Cab-operated or remotely operated bridge cranes (powered) - 25%
c. Pendant-operated bridge cranes (powered) - 10%
d. Bridge cranes or monorail cranes with hand-geared bridge, trolley, and hoist - 0%
Per commentary on the AISC ASD 9th Edition Specifications for Structural Steel Buildings 1989, these percentages are based on the Association of Iron and Steel Engineers publications (AISE 1979), so these percentages seems to be specific for bridge or overhead cranes supported by steel structures. I was wondering are there any other references for gantry cranes and their impact loads which are supported by concrete structures. Does anyone know ISO 12480 may have some guidance on the impact loads?