1 Ton x 4000 mm Radius column mounted Jib Crane 360°
JIB ARM SECTION SELECTION: ( Ref. Drg. No. JCL / 1T / TEMWE / 08-09 ) Universal Beam Is Used as Jib Arm 305 x 305 x 118 Properties : Area : 150 cm 2 Ixx Iyy Zxx Zyy
: : : :
27670 cm 2059 cm 4 1760 cm3 589 cm3
4
CHECKING OF JIB ARM Bending Movement with impact:
S.W.L.
=
1000 kgs
Weight of Chain Block = 75 kgs. Total Wt. Impact 1075 =
= =
x 1.3
1000 kgs +
75 kgs
= 1075 kgs.
1.3 =
1397.5 kg.
1397.5 kg with Impact
B. M. =
1397.5 x 400
Bending Stress
=
559000 kg. cm
=
B. M. ZYY
=
559000 589
=
949.066 kg/cm2 Page no. 1
BENDING STRESS ALLOWED: Basic stress =
1537.7 kg.
Bending Stress
=
=
1537.7 x 0.95
Basic Stress
x
Duty Factor.
1460 kg/cm 2
=
(For CL II duty Factor is 0.95)
949.066
<
1460
Hence Girder is adequate for Bending Stress
Live Load deflection of Jib Arm (∂) =
WL3 3EI
=
1075 x 400 3 3 x 2 x 106 x 27670
=
0.414 cm
=
4.14 cm
Deflection (∂) allowed 4000 350
=
W L E
= 1000 kg + C.P.B wt. 75 kg. = 400 cm = 2 x 10 6
I
=
27670 cm
4
11.42 mm
4.14 < 11.42 Hence Selected Section is adequate for Jib arm
