What is the importance of limiting the depth of neutral axis in the limit state method?

The maximum depth of neutral axis is limited to ensure that tensile steel will reach its yield stress before concrete fails in compression, thus a brittle failure is avoided.

What is the limiting depth of neutral axis?

Therefore, the depth of the neutral axis has a limiting or maximum value = xu, max. Accordingly, if the Ast provided yields xu > xu, max, the section has to be redesigned. Since xu depends on the area of steel, we can calculate Ast, lim from Eq. 3.17.

What are the limiting values of depth of neutral axis for different grades of steel?

The limiting depth of neutral axis for a beam having effective depth of 400 mm with Fe 250 grade steel is:

• 609 mm.
• 318 mm.
• 425 mm.
• 212 mm.

What is the value of limiting depth of neutral axis for fe415 grade of steel?

Use M20 grade of concrete and Fe 415 grade of steel. 180mm.

What is the limiting value of neutral axis Fe 415 steel?

The maximum depth of neutral axis for a beam with ‘d’ as the effective depth, in limit state method of design for Fe 415 steel is. 0.46d.

When neutral axis is greater than critical neutral axis it is?

b) If the depth of actual neutral axis (n) is greater than the depth of critical neutral axis (nc) then the section is called as over reinforced section and in this case the concrete in compressive zone attains its maximum stress earlier than the steel in the tensile zone.

What is the limiting moment of resistance for the fe415 steel?

For M 15 grade concrete and Fe 415 grade steel the limiting moment of resistance factor is. 3.15. 3.73.

What is the limiting depth of neutral axis for FE 500?

Calculation: ∴ For Fe 500, xu = 0.46 × (550-50) = 230 mm.

What is the limiting value of moment of Fe 415 steel in LSM?