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CRANE LOAD CALCULATION
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Runway beam linear self weight
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Urb
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=
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=
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Label
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[kip/ft]
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Crane rail linear self weight
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Ucr
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=
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=
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Label
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[kip/ft]
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Crane runway + rail selfweight
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Rsw
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=
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(Urb + Ucr) x Lver
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=
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Label
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[kips]
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Crane-1
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Wheel load by bridge selfweight
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Pbr
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=
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Wbr / (2 or 4 wheel x 2 sides)
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=
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Label
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[kip/per wheel]
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Side Thrust Load
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Hs1
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=
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0.4 Lifted Load
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=
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Label
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[kips]
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Hs2
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=
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0.2 (Lifted Load+ Trolley/Hoist Wt)
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=
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Label
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[kips]
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Hs3
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=
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0.1 (Lifted Load+ Entire Crane Wt)
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=
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Label
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[kips]
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Hs4
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=
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1.0 x Lifted Load
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=
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Label
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[kips]
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Hs5
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=
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2.0 x Lifted Load
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=
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Label
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[kips]
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Hst
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=
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Label
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=
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Label
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[kip/per wheel]
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Tractive Load
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Htr
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=
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0.2 Max wheel load Pmax
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=
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Label
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[kip/per wheel]
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Vertical Load
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Min. hook aproach
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Smin
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=
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min (SL, SR)
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=
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Label
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[ ft ]
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Max wheel load by calc
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Pmax-c
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=
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(Wrc+Wth) x (Sr-Smin)
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+ Pbr
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no of wheel x Sr
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=
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Label
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[kip/per wheel]
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Max. wheel load by vendor
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Pmax-v
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=
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=
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Label
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[kip/per wheel]
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Max static wheel load
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Pmax
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=
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max (Pmax-v , Pmax-c)
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=
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Label
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[kip/per wheel]
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Min static wheel load
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Pmin
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=
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(Wrc+Wth) x Smin
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+ Pbr
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no of wheel x Sr
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=
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Label
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[kip/per wheel]
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Crane-2
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Wheel load by bridge selfweight
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Pbr
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=
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Wbr / (2 or 4 wheel x 2 sides)
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=
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Label
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[kip/per wheel]
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Side Thrust Load
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Hs1
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=
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0.4 Lifted Load
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=
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Label
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[kips]
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Hs2
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=
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0.2 (Lifted Load+ Trolley/Hoist Wt)
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=
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Label
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[kips]
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Hs3
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=
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0.1 (Lifted Load+ Entire Crane Wt)
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=
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Label
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[kips]
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Hs4
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=
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2.0 x Lifted Load
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=
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Label
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[kips]
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Hst
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=
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Label
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=
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Label
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[kip/per wheel]
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Tractive Load
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Htr
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=
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0.2 Max wheel load Pmax
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=
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Label
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[kip/per wheel]
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Vertical Load
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Min. hook aproach
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Smin
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=
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min (SL, SR)
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=
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Label
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[ ft ]
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Max wheel load by calc
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Pmax-c
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=
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(Wrc+Wth) x (Sr-Smin)
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+ Pbr
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no of wheel x Sr
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=
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Label
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[kip/per wheel]
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Max. wheel load by vendor
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Pmax-v
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=
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=
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Label
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[kip/per wheel]
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Max static wheel load
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Pmax
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=
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max (Pmax-v , Pmax-c)
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=
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Label
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[kip/per wheel]
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Min static wheel load
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Pmin
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=
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(Wrc+Wth) x Smin
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+ Pbr
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no of wheel x Sr
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=
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Label
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[kip/per wheel]
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Crane runway beam span - ver
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Lver
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=
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Label
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[ ft ]
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for max member forces and deflection calc
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Crane runway beam span - hor
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Lhor
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=
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Label
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[ ft ]
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Crane runway beam span - ver
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L1
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=
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Label
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[ ft ]
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for max support reaction calc
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L2
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=
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Label
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[ ft ]
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Crane Wheel Load Distance
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Label
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d1
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=
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Label
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[ ft ]
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d2
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=
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Label
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[ ft ]
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d3
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=
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Label
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[ ft ]
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d10
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=
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Label
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[ ft ]
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Crane-2 wheel distance
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d11
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=
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Label
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[ ft ]
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d12
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=
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Label
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[ ft ]
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d13
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=
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Label
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[ ft ]
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Crane Wheel Load
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On The Side Close To Hook
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use max static wheel load Pmax
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Label
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P1
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=
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Label
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[kips]
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Crane-2 wheel load
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P2
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=
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Label
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[kips]
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On The Side Far To Hook
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use min static wheel load Pmin
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Label
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P1
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=
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Label
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[kips]
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Crane-2 wheel load
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P2
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=
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Label
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[kips]
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Max Member Forces for Crane Runway Beam Design
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Max Unfactored Moment
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Label
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when x
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=
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Label
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[ ft ]
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crane beam gets max moment Mcr due to moving load
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Moment by moving wheel load - ver
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Mcr-ver
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=
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=
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Label
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[kip-ft]
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Label
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when x
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=
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Label
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[ ft ]
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crane beam gets max moment Mcr due to moving load
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Moment by moving wheel load - hor
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Mcr-hor
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=
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=
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Label
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[kip-ft]
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Moment caused by beam and rail self-weight
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Msw
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=
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(Urb + Ucr) Lver2 / 8
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=
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Label
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[kip-ft]
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Max Unfactored Shear
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when x
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=
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Label
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[ ft ]
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crane beam gets max shear Vcr due to moving load
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Shear by moving wheel load
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Vcr
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=
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=
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Label
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[kips]
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Vsw
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=
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(Urb + Ucr) Lver / 2
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=
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Label
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[kips]
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CISC Crane Guide
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Vertical load impact factor
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a
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=
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=
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Label
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Table 2.1
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Runway beam + rail selfwei
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U
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=
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Urb + Ucr
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=
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Label
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[kip/ft]
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Max ver. load /wheel (no impact)
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Pmax
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=
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=
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Label
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[kips / per wheel]
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Max hor. load /wheel
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Ph
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=
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=
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Label
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[kips / per wheel]
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Crane Load for AISC ASD Design
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Bending moment x-x axis
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Mx
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=
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Mcr-ver x a (impact) + Msw
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=
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Label
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[kip-ft]
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Bending moment y-y axis
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My
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=
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Mcr-hor x Ph / Pmax
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=
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Label
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[kip-ft]
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Shear along y-y axis
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Vy
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=
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Vcr x a (impact) + Vsw
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=
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Label
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[kips]
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Crane Load for AISC LRFD Design
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Wheel load by bridge selfwei
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Pbr
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=
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Wbr / (no of wheel * 2 sides)
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=
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Label
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[kips]
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as dead load
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Wheel load by lift load + trolley
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Plt
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=
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Pmax - Pbr
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=
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Label
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[kips]
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as live load
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Max factored ver. load /wheel
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Pv-f
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=
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1.2 x Pbr + 1.6 x Plt x a(impact) |
=
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Label
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[kips]
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impact included
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Max factored hor. load /wheel
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Ph-f
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=
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1.2 x Pbr + 1.6 x Plt
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=
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Label
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[kips]
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Factor bending moment x-x axis
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Mx
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=
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Mcr-ver x Pv-f /Pmax + Mswx1.2
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=
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Label
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[kip-ft]
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Factor bending moment y-y axis
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My
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=
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Mcr-hor x Ph-f / Pmax
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=
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Label
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[kip-ft]
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Factor shear along y-y axis
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Vy
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=
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Vcr x Pv-f / Pmax +Vsw
x1.2
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=
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Label
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[kips]
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Max Deflection
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Label
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when x
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=
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Label
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[ ft ]
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crane beam gets max deflection due to moving load
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Max deflection by moving load - ver |
Dcr-ver
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=
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=
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Label
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Label
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when x
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=
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Label
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[ ft ]
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crane beam gets max deflection due to moving load
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Max deflection by moving load - hor |
Dcr-hor
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=
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=
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Label
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Crane Load Imposed on Building Column for Building Design
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Max Support Reaction
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when x
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=
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Label
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[ ft ]
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crane beam gets max reaction Rcr due to moving load
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Vertical Load
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Reaction On the Side Close to Hook
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Reaction by moving wheel load
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Rcr-c
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=
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=
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Label
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[kips]
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Reaction by crane beam self wt
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Rsw
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=
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0.5 (Urb + Ucr) (L1 + L2)
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=
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Label
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[kips]
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Sum
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R1
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=
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Rcr-c + Rsw
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=
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Label
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[kips]
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Reaction On the Side Far to Hook
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Reaction by moving wheel load
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Rcr-f
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=
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Rcr-c x Pmin / Pmax
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=
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Label
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[kips]
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Reaction by crane beam self wt
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Rsw
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=
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0.5 (Urb + Ucr) (L1 + L2)
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=
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Label
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[kips]
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Sum
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R2
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=
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Rcr-f + Rsw
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=
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Label
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[kips]
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Side Thrust Load
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Crane -1
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Side thrust load per wheel
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Hst
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=
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Label
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=
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Label
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[kip/per wheel]
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Max static wheel load
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Pmax
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=
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=
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Label
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[kip/per wheel]
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Side thrust load
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=
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Rcr-c x Hst / Pmax
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=
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Label
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[kips]
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Tractive Load
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Crane -1
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Tractive load per wheel
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Htr
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=
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0.2 Max wheel load
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=
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Label
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[kip/per wheel]
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Max static wheel load
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Pmax
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=
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=
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Label
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[kip/per wheel]
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Tractive load
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=
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Rcr-c x Htr / Pmax
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=
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Label
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[kips]
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Point Moment to Building Column Center
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M1
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=
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R1 x eR
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=
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Label
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[kip-ft]
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M2
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=
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R2 x eL
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=
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Label
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[kip-ft]
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Summary of Crane Load Imposed on Building Column
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Label
Label
Label
Label
Label
Label
Label
Label
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Note:
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- All loads shown above are unfactored static load, dynamic impact factor is not included
- The crane loads shown above may be reverse if crane hook goes to the other side.
When reverse the loads and apply them on building columns, the point moment value
may need adjusted if eccentricity eL ≠ eR
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Bumper Force at Building End Frame
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|
AISC Design Guide 7
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Bumper force to be the greater of
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1. Twice the tractive force
|
=
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Label
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[kips]
|
section 18.6 on Page 65
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2. 10% of entire crane weight
|
=
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Label
|
[kips]
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Bumper force used for design
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=
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Label
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[kips]
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User shall apply longitudinal bumper force to both sides of building end frame
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Label
Label
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Note:
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- All loads shown above are unfactored static load, dynamic impact factor is not included
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