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23/08/2026

What kind of steel bars used in construction..

Steel Quantity Required in RCC Structure (Approximate Values)Steel reinforcement is one of the most important components...
20/07/2026

Steel Quantity Required in RCC Structure (Approximate Values)

Steel reinforcement is one of the most important components of RCC (Reinforced Cement Concrete). The percentage of steel varies depending on the structural member, design loads, span, seismic requirements, and applicable design codes. The values shown below are commonly used for preliminary quantity estimation for 1 m³ of concrete.

Approximate Steel Requirement:

Slab: ~1% of concrete volume ≈ 392.5 kg/m³

Beam: ~2% of concrete volume ≈ 785 kg/m³

Footing: ~0.8% of concrete volume ≈ 314 kg/m³

Column: ~2.5% of concrete volume ≈ 981.25 kg/m³

Key Notes:

Steel density = 7850 kg/m³.

These values are approximate and intended for estimation only.

Actual reinforcement depends on structural analysis, loading conditions, bar detailing, and local design standards...

Concrete technology , Only sharp civil engineers will get this one right.🤔 Drop your answer
22/06/2026

Concrete technology , Only sharp civil engineers will get this one right.
🤔 Drop your answer

22/06/2026

*ʼMinerva Talkies* where Sholay film was running for many years.
Now at the same place, today.. Lokhandwala and Shapoorji Pallonji have designed a multi storey building having 91 floors, at Grant Road Mumbai.
This is the tallest building in India at this location, standing 301 meters tall and 91 stories high!!!
(Pride of Maharashtra)🤷‍♀️✌🏼🙋‍♂️

22/06/2026

*ʼMinerva Talkies*
where Sholay film was running for many years.
Now at the same place,
today.. Lokhandwala and Shapoorji Pallonji have designed a multi storey building having 91 floors, at Grant Road Mumbai.
This is the tallest building in India at this location, standing 301 meters tall and 91 stories high!!!
(Pride of Maharashtra)🤷‍♀️✌🏼🙋‍♂️

20/06/2026

Save rain water by using this rainny product..

Cantilever Beam Tension Cracks – Detailed Notes1. Nature of Cantilever Beams- A cantilever beam is fixed at one end and ...
14/06/2026

Cantilever Beam Tension Cracks – Detailed Notes

1. Nature of Cantilever Beams
- A cantilever beam is fixed at one end and free at the other.
- When subjected to loads, the top fibers experience tension, while the bottom fibers undergo compression.

2. Incorrect Reinforcement Placement
- If steel reinforcement is placed at the bottom, it resists compression instead of tension.
- This leads to tension cracks forming at the bottom surface since concrete is weak in tension.
- Such detailing reduces durability and structural safety.

3. Correct Reinforcement Placement
- Reinforcement must be placed at the top zone of the cantilever beam.
- Steel resists tensile stresses effectively, preventing cracks.
- This ensures strength, serviceability, and long-term durability.

4. Cross-Section Detailing
- Incorrect: Steel at bottom → tension cracks visible.
- Correct: Steel at top → no cracks, safe design.

5. Why It Matters
- Cantilever beams are common in balconies, projections, and bridges.
- Proper detailing avoids premature failure.
- Ensures safety, economy, and longevity of the structure.

6. Key Takeaway
- Always place reinforcement in the tension zone
(top for cantilever beams).
- Bottom reinforcement is only for compression and secondary requirements.

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✅ Summary

Cantilever beams crack at the bottom if reinforcement is wrongly placed there. Correct detailing requires top reinforcement to resist tension stresses. This principle is fundamental in structural engineering to ensure safety and durability.

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