Design Of Crane Beams

Design of a simply supported beam to carry an electric over head crane. The design data are as follows :Crane capacity Span between crane rails Weight of crane Weight of crab Minimum hook approach End carrage wheel centers Span of crane girder Self weight of crane girder

100 kn 20 m 90 kn 20 kn 1.1 m 2.5 m 5.5 m 8 kn

= = = = = = = =

43 steel using BS 5950

Design for Grade

MAX WHEEL LOADS,MOMENTS&SHEAR 20 kn number of leg wheels= Max Static loads= r*n at A=

90 kn A

4 79.2 56.7

B

18.9 m 20 m

Vertical Wheelload Including Impact 1)for electric overhead cranes:- 25% 2)for hand operated cranes:- 10% vertical Wheelload Including Impact 25% of Max static load= 99

0.25 Horizontal Surge Load 1)for electric overhead cranes:- 10% 2)for hand operated cranes:- 5% Horizontal surge=

(BS 2573, rules for design of cranes part1) 3 kn (using limit state design)

0.1 Determination of The Max moment due to two moving loads by Influence lines we know that the max moment will occur in the case below.

99 Kn

99 Kn 2.5 m 1.25

A

0.63

0.63

8

C 0.88 m 2.75 m

Ra

2.13 m 2.75 m

kn kn

ng Impact kn

anes part1)

Influence lines

kn

B

Rb