monorail beam design
monorail beam design
(OP)
I have a exsiting monorail system ,we'er planning a special lift . I have used a recommended analysis in the past which adds 20% of the lift load as a horz. load . This lift is inside a enclosed structure ,under very controlled guidlines ,minimum speed no lateral movement.this lift is for construction related activites ,I assume the addition of the horz. component is to compensate for unknown loadings in normal use. since this is not the case I am inclined to overlook this horz, component ,the verticle lift load puts the stress levels at 1/2 that allowable ,any comments .






RE: monorail beam design
RE: monorail beam design
Longitundinally, you should have an allowance for accelerating and braking as indicated above.
RE: monorail beam design
The 20% allowance for horizontal forces, that I am familiar with, is for sizing the supporting structural steel (see AISC Manual of Steel Construction, Section A3). This has little to do with the actual use of the crane.
Crane "use" requirements are typically based on the crane manufacturer's stated lifting capacity (assuming the structural steel supports were correctly designed). In the USA, OSHA allows normal crane use up to rated capacity and even controlled condition test loads up to 125% of rated capacity.
Since your calculations indicate that the structural steel supports are adequate, suggest that you base your decision to proceed, or not, on the rated capacity of the crane. If the load exceeds the rated capacity let us know the numbers, we may be able to provide additional comments.
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RE: monorail beam design
Check the deflection limitation of the equipment. Sometimes it's L/450; sometimes it's higher. If the slope of the bottom flange due to deflection is too great, the hoist may not be able to move along the flange.
RE: monorail beam design
RE: monorail beam design
My only concern in eliminating this load case would be when someone tries to lift something that is not in line with the crane rail.
RE: monorail beam design
RE: monorail beam design