Question

In absence of detailed design, approximately how much percentage for steel reinforcement may be considered for estimation of RCC lintels
1. 1.0 to 5.0 %
2. 0.7 to 1.0%
3. 0.2 to 0.5 %
4. 1.0 to 10.0%

Answer 1

Correct Answer - Option 2 : 0.7 to 1.0%

Concept:

Lintels:

• Lintels are provided over the openings in walls. They are provided over the doors, windows, and other openings to support the load of the wall above the openings.
• The distribution of loads over the lintel depends upon the height of the wall above the lintel and the length of the wall available on the sides of the opening. 
• In absence of detailed design, 0.7 to 1.0% or steel reinforcement may be considered for estimation of RCC lintels.

Different types of Lintels:

• RCC lintel
• Timber lintel
• Stone lintel
• Steel lintel
• Reinforced brick lintel

Reinforcement of different sections:

For Beams:

• Maximum reinforcement = 4% of gross area
• Minimum reinforcement = 0.85bd/f_y

For column: 

• Maximum reinforcement = 6% of gross area
• Minimum reinforcement = 0.8% of gross area

For slab:

• Minimum reinforcement = 0.15% of gross area(For mild steel)
• Minimum reinforcement = 0.12% of gross area(For HYSD bars)