Overhead Cranes
Overhead Cranes
(OP)
Hi,
Re overhead travelling cranes
Can anyone advise if lateral inertia loads due to longitudinal acceleration of a crane bridge apply concurrently with loads due to oblique travelling/skewing of crane bridge during normal operations?
Notes re various codes requirements:
AS1418.1 combine inertia loads due to crane bridge acceleration with oblique travelling loads.
EN1991-3:2006 does not combine acceleration of crane bridge with oblique travelling/skewing of crane bridge.
cheers
Re overhead travelling cranes
Can anyone advise if lateral inertia loads due to longitudinal acceleration of a crane bridge apply concurrently with loads due to oblique travelling/skewing of crane bridge during normal operations?
Notes re various codes requirements:
AS1418.1 combine inertia loads due to crane bridge acceleration with oblique travelling loads.
EN1991-3:2006 does not combine acceleration of crane bridge with oblique travelling/skewing of crane bridge.
cheers






RE: Overhead Cranes
DaveAtkins
RE: Overhead Cranes
RE: Overhead Cranes
RE: Overhead Cranes
I was referring to acceleration loads PHB due to long-travel drives as shown below.
and oblique travelling loads (Y21) as shown below
cheers
RE: Overhead Cranes
The only way I would ignore this combined loading would be if the crane couldn't physically traverse in both directions at the same time. But most cranes I've seen can traverse in both directions at the same time, so ignoring the effect is flawed even if it's not specifically covered by the code of your choosing.
RE: Overhead Cranes
Y forces are born when the crane travels along the runway in a skewed position and the wheel guides make contact/hit the rail. This contact "straighten" the crane along the runway.
These forces are associated with long travel only, that is crane/hoist travel in one direction at the time.
I wanted to get a feel for whether these forces act at the same time as most overseas codes say they do not or the probability of that happening is very low and not considered.
I combine them all right - I also use only AS1418 - but the 10mm maximum deflection for runway supporting structures required by AS1418.18 is very strict.
There is no such restriction in overseas codes which are more relaxed in terms of required maximum deflection of structures supporting runways and I ask myself WHY?