For a steel member in tension, the permissible stress in axial tension is given by
0.6 fy
Steel Member Axial Tension Permissible Stress
When designing steel structures, engineers must ensure that the stresses experienced by the members under load do not exceed safe limits. These limits are known as permissible stresses.
For a steel member subjected to axial tension (pulling force along its axis), the permissible stress is a critical design parameter. This value is typically based on the material's yield strength, denoted as $f_y$. The yield strength is the stress at which the steel begins to deform permanently.
Design codes and standards specify safety factors to prevent failure. For axial tension in steel members, a common value for the permissible stress is taken as 60% of the yield strength.
Therefore, the permissible stress in axial tension for a steel member is generally calculated as:
Permissible Stress = $0.6 \times f_y$
This means that the actual stress induced in the member due to the tensile load should not exceed $0.6 f_y$ to maintain a sufficient safety margin against yielding and potential failure.
Important Questions from Tension Member
A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, then what is the net effective area of the angle?
A) \(a-\frac{b}{1+0.35\times\frac{b}{a}}\)
B) \(a+\frac{b}{1+0.35\times\frac{b}{a}}\)
C) \(a-\frac{b}{1+0.20\times\frac{b}{a}}\)
D) \(a+\frac{b}{1+0.20\times\frac{b}{a}}\)
The net area of round bars to resist the tension, is the area of the cross-section at
A steel plate is 300 mm wide and 10 mm thick. It has one rivet of nominal diameter 18 mm. The net sectional area of the plate is
The best tension member section will be as:
For preliminary sizing, the rupture strength of net section may be approximately taken by using the below equation as per IS ∶ 800-2007,
Tdn = αAnfu/γml
What is the "α" value for one or two bolts along the length in the end connection or equivalent weld length.
