To calculate dead and live load for industrial steel structures and to apply them using TSD
A.
Loadings
Dead load
Slab load = 200 mm
Finishes (50 mm) = 0.05 m x 24 KN/m3 = 1.2 KN/m3
Brickwall with cement plaster thickness = 150 mm
Unit weight = 20 KN/m3
Floor height ( GF to FF) = 5.200 m
Brick wall loading = 15.6 KN/m
FLoor height ( FF to Roof) = 19.868 m
Brick wall loading = 59.604 KN/m
Roof loading based on purlin size = 20 KN/m3 ( as per IS 875 part -1)
Ceiling load = 0.3 KN / m2
Live load ( IS 875 part -2)
Staircase = 5 KN /m3
Office = 3 KN /m3
Toilets = 2 KN /m3
Rest room =3 KN /m3
Equipment room = 10 KN /m3
Conference room = 5 KN /m3
Common room= 5 KN /m3
Roof loading = 0.75 KN /m2
Crane 5T
Crane capacity = 50 KN
Self Weight of crane = 40 KN
Wt of trolley car = 10 KN
The approximate minimum approach of the crane hook to the gantry girder = 1m
C/C distance between gantry rails = 18 m
C/C distance between column =5.85 m
Wheel base = 2m
Maximum concentrated load on crane = 50+ 10 =60 KN
Self wt of crane that act as UDL = 40 / 18 = 2.22 KN /m
Taking moment about B
RA = 76.66KN
RA + RB = 100
RB = 23.33 KN
The reaction from crane girder is equally distributed on the wheels at end of the crane girder
Maximum wheel load on each wheel of crane = 76.66 /2 = 38.33 KN
Max BM
Assume self wt of gantry girder as 1.5 KN /m
Total dead load = ( self wt of rail +self wt of gantry girder) 300 + 1500 = 1.8 KN/m
Taking moment @ D
Rc =38.32 KN
RC + RD = 38.33 + 38.33
RD = 38.33 KN
BM under wheel due to live load = RD x2 = 76.66 KNm
BM under wheel due to Impact = 0.10 x 76.66 = 7.66 KNm
Total BM due to live load & Impact = 76.66 + 7.66 = 84.326 KNm
BM due to dead load = WL ^2 / 2 = 1.8 x 5.85 x5.85 /2 = 7 .1 KNm
Max BM = 84.326 + 7.1 = 91.426 KNm
Max SF
Rc x 5.85 - 3.8 x 5.85 - 3.8x 3.85 =0
Rc = 63.2 KN
Max SF due to wheel load = 63.2 KN
Lateral forces
Lateral forces transverse to rails = 5% of wt of crab & wt lifted = 0.05 x (50+ 10) = 3
Lateral force on each wheel F1 = 3/2 = 1.5 KN
Max Horizontal reaction due to lateral force by proportion at c
= lateral force x reaction at C due to vertical load / max wheel load due to vertical load
= 1.5 x 38.32 / 38 = 1.51 KN
@ D = 2- 1.51 = 0.5 KN
BM due to lateral load by proportion = 1.5 / 38 x 63.2 = 2.5 KNm