Jib Crane Calculation 6t4l1h

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 cm2 Ixx Iyy Zxx Zyy

27670 cm4 2059 cm4 1760 cm3 589 cm3

: : : :

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/cm2

=

(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 4003 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 106

I

=

27670 cm4

11.42 mm

4.14 < 11.42 Hence Selected Section is adequate for Jib arm

Page no. 2