WHEEL LOAD CALCULATION FOR GANTRY CRANE A. Desi gn L oads 1 Self elf Wei Weight ght W
Q'ty
Total W
Height
(kg)
(m)
(kg) Girder + Rail
Wx h
4,587
2
9,174
13
Tie Bar Girder
300
2
600
12.5
119,262 7,500
Walkway
942
1
942
13.5
12,717
Fixed Leg
7,680
1
7,680
6.5
49,920
Flexible Leg
5,475
1
5,475
7.5
41,063 16,200
Hoist and Crab
1,200
1
1,200
13.5
End Carriage and Drive
2,100
1
2,100
0.9
1,890
9.15
248,552
Total weight
W=
2 Wi nd nd L oa oad 2.1 Windage Area
27,171 kg
Windage
Shape
A
Coeffici fficien ent
(m2)
A x Cs
Height
A x Cs x h
h
Cs
(m)
Girder
21.2
1.5
31.8
13
413.4
Leg
12.3
0.5
6.15
6.5
39.975
33.5
1.133
37.95
11.95
2.2 Wind Load - Operation Wind speed
V=
Windage area
A=
Drag coefficient Wind load
20 m/sec 33.5 m2
Cs =
Normal condition
1.13
2
949 kg 949 kg
F1 = Cs x A x V /16 =
2.3 Wind Load - Storm Wind speed
V=
Windage area
A=
Drag coefficient Wind load
35 m/sec 33.5 m2
Cs =
1.13
2
2,906 kg
F2 = Cs x A x V /16 =
Extreme condition
3 Seismi eismicc Loa Loadd
4,883 kg
Site class
SD
Peak acceleration
Sa =
Modification factor
R=
Importance factor
I=
Seismic load
0.629 g 3.5 (f (for steel structure) 1.0
Fs = Sa x I / R x W =
4,883 kg
B. Wheel load Lifting load
WL =
Hoist and Crab
WC =
10,000 kg 1,200 kg kg
Self weight (Fixed)
WFX =
14,088 kg
Self weight (Flexible)
WFL =
11,883 kg
Rail span
LR =
18.5 m
Wheel base
LB =
8m
Height _ wind
H1 =
11.95 m
Height _ seismic
H2 =
9.15 m
Min. distance of hoist
LM =
1 m (from rail)
1 Norma ormall conditi condition on P1 = WFX/2 + (WL+WC)x(LR-LM)/LR/2 = P2 = F1 x H1 / LB / 2 =
12,341 kg 708 kg
Vertical wheel load = Horizontal wheel load =
13,050 kg 474 kg (taken by fixed side)
127.9 kN 4.6 kN
2 Extre Extreme me condition condition P1 = WFX/2 + WCx(LR-LM)/LR/2 = P2 = Fs x H2 / LB / 2 = P=
7,612 kg 2,792 kg
Vertical wheel load = Horizontal wheel load =
10,403 kg 2,442 kg (taken by fixed side)
102.0 kN 23.9 kN
453.375
