Tensile Stress
The allowable tensile stress, as calculated in STAAD.Pro as per IS:800 is described below.
The permissible stress in axial tension, σat in MPa on the net
effective area of the sections shall not exceed
where
| fy | = | minimum yield stress of steel in MPa |
Compressive Stress
Allowable compressive stress on the gross section of axially loaded
compression members shall not exceed 0.6·fy nor the
permissible stress sac calculated based on the following
equation (per Clause: 5.1.1):
| σac = 0.6{( fcc
· fy)/[( fcc)n
+ (fy)n]1/n} | |
where
| σac | = | Permissible stress in axial compression, in MPa |
| fy | = | Yield stress of steel, in MPa |
| fcc | = | Elastic critical stress in compression = π2 E/λ2
|
| E | = | Modulus of elasticity of steel, 2 X 105 MPa |
| λ | = | l/r = Slenderness ratio of the member, ratio of the effective length to
appropriate radius of gyration |
| n | = | A factor assumed as 1.4. |
