| S.No. | DESCRIPTION | IS 800 CODE AISC, MBMA CODE |
AISC,MBMA CODE (LATEST CODE) |
|---|---|---|---|
| 1 | Minimum thickness for Primary Members | 6mm (Not clearly specified ) |
3.15mm |
| Minimum thickness for secondary cold form members | 2 mm (Not Clearly specified ) |
1.5 mm | |
| 2 | Deflection Vertical | L/240 | L/180 |
| Deflection Horizontal | H/150 without crane H/200 with crane |
EH/100 | |
| Deflection for purlins/Girts | L/150 | L/180 | |
| 3 | Live Load | 0.75 KN/M2 | 0.57 KN/M2 |
| 4 | Bracing | Rod/cable bracing | Rod/cable/angle tension bracing |
| 5 | Stiffeners | Required by design | Not required by design |
| 6 | Expansion joints | After every 60 m length of the bldg. using double frame. | After 120m only .double frame not required. |
| 7 | Material- structure | IS 226 GR 36/240MPA | ASTM A 572 GR50/345MPA |
| Bolts & Nuts | IS 1363 | ASTM A 325 high strength bolts | |
| 8 | Welding | Double side welding | Single side welding as per AWS |
| 9 | Load Combination | DL+LL DL+WL/EQ DL+WL/EQ |
DL+LL Not Applicable. DL+WL/EQ |
| 10 | Crane Beam & Supporting Structure | Increase Stress by 10 % of the allowable stress | No increase allowed. |
| 11 | Crane Girder Deflection | Span/750 Vertical Horizontal | Span/600 Vertical Span/400 Horizontal |
| 12 | Stress increase for seismic and wind loads | Not allowed Primary framing where wind load is governing Load | 1/3RD Stress increase allowed. |
