Cold form section Purlin design as per IS 811 & BS 5900
purlin & runner design
purlin
Design of Purlin
purlin
Load Calculation
Our FX450 C/Z purlin machine driven by gearboxes, consists of decoiler, feeding and levelling device, punching system, pre-shear, roll forming system, hydraulic post cutting, run out table, hydraulic station and PLC(controlling system). Its special f
Our NL300 C/Z purlin machine consists of decoiler, feeding and levelling device, punching system, pre-shear, roll forming system, hydraulic post cutting, run out table, hydraulic station and PLC(controlling system). Its special quick change feature:
It is good explanation sheet for using purlin, side runnerFull description
Design of Purlin Design of Purlin (rectangular Sections Only):roof slab
Y
metal deck
X
X purlin
Y Load on purlin 1) Dead Load (DL) +Selfweight(S)
=
Spcing Length
2m 5m
0.69 Kn/m
2) Live Load (LL) = 1.50 Kn/m Wind Load 3) Windload-3(WL3)= -2.6 Kn/m 4) Windload-4(WL4)= 0.9 Kn/m 3) DLS+LL 2.195 N Biaxial bending Pitch of the Roof= 1/30 Hence theta= 1.91 Sin 0.03 Cos 1 Load Normal to Slope (Wdlx) = 2.19 Kn/m Load Parallel to Slope (Wdly) = 0.07 Kn/m Loads on Purline-Case-1 Wind Load Normal to Slope (WL4) = 0.9 Kn/m Moments Mdlx = Mdly =
7.66 Kn-m 0.18 Kn-m
((Wdlx+Wl4)*L2/10) (Wdly*L2/10)
7662704.62 182773.49
N-mm N-mm
Member Selection For I section Zx/Zy=5 to7 For c section Zx/Zy=8
for light load and 7 to 10 for heavy load
Lest Assume I section thus
Zx/Zy=
6
bt= 165 N/sqmm Now Zx=Mdlx/bt*(1+Zx/Zy*Mdly/Mdlx)
Zx
= =
53086.94 Cumm 53.09 Cucm
Loads on Purline-Case-2 Wind Load Normal to Slope Moments
(WL3)
Mdlx = Mdly =
((Wdlx+Wl3)*L2/10) (Wdly*L2/10)
-1.06 Kn-m 0.18 Kn-m
=
-2.6 Kn/m
-1055295.38 182773.49
Member Selection For I section Zx/Zy=5 to7 For c section Zx/Zy=8
for light load and 7 to 10 for heavy load
Lest Assume I section thus bt= 165 N/sqmm Now Zx=Mdlx/bt*(1+Zx/Zy*Mdly/Mdlx)
Zx/Zy=
6
N-mm N-mm
Zx
= =
13042.04 Cumm 13.04 Cucm
Thus required Section with Zx= Requird Zy=
53.09 cm3 8.85 cm3
I section Satisfying above 2 creteria is ISMB 125 Zxx = 71.8 cm3 Zyy = 11.7 cm3 Ixx = 449 cm4 Iyy = 43.7 cm4 Chk for Actual Stresses Case-1
Use ISMB 150 as Purline Over Roof Self Weight= 14.9 kg/m Total No. 7 of 20.0m long Total Weight 2.09 Mt
Load Calculation for Purlin Spacing of purlin @2000c/c
=
2m
Dead Load Average thickness of slab
For Sheeting mm
Selfweight @2500Kg/m )
0
3
30mm thick Polyurethane foam @ 45Kg/m ) 50mm thk foam Conc. @ 500kg/m3 12mm thk Plaster over Foam Concrete and RCC slab 20 thk tiles @2100 Kg/m3 Metal Deck (1mm) @15 Kg/m2 Sheeting 0.5mm thk Total
0 0 0 0 0 3.93 3.93
3
Assuming total dead load = Live load on roof = Dust Load = Hung Load = Total load on roof= Load on Purlin Dead load= 3.925 Kg/m2 Live load= 75.00 Kg/m2 Self Weight Wind Load from Load Claculation Sheet Case-3 (Away)= 1.31 Kn/m2
