The Effect of Reinforcement Spacing on Structural Strength

In reinforced concrete construction, the spacing of rebars is more than just a technical detail in the working drawings. This spacing directly affects the strength, stability, and durability of the building structure. Small errors in determining the spacing of rebars can have a significant impact on the overall performance of the structure.

So, how important is the spacing of rebars? Here's a technical explanation.

1. The Main Function of Reinforcement in Concrete
Concrete has high compressive strength but is weak against tensile forces. This is where rebar plays a role in resisting tensile forces. For this function to function optimally, the rebar must:

• Be evenly distributed
• Be installed at the correct spacing
• Work together with the concrete as a single structural unit
• Proper spacing of rebars ensures that the concrete and rebar bond well.

2. Impact of Excessive Spacing of Rebars
If the spacing between rebars is too wide in structural calculations, the following risks arise:

• Concrete is more prone to cracking because tensile forces are not optimally resisted
• Load distribution becomes uneven
• The structure's flexural and shear capacity is reduced
• This condition often occurs in floor slabs and beams, especially in multi-story buildings.

3. Impact of Too Close Reinforcement Spacing
Conversely, too close reinforcement spacing is also not a solution. Possible impacts include:

• Concrete is difficult to flow and fill the gaps between the reinforcement bars
• Honeycomb formation in the concrete
• Concrete and steel bond is not optimal
• Besides reducing structural quality, too close spacing also complicates the casting process in the field.

4. Impact on Concrete and Steel Bonding
Ideal reinforcement spacing allows for optimal bonding between the concrete and the steel. If the spacing is not appropriate:

• Slippage occurs between the concrete and the steel
• Stress is not properly distributed
• Structural cracks are more likely to appear

This is why reinforcement spacing is always technically calculated by structural engineers.

5. Relationship between Reinforcement Spacing and Concrete Cover
Determining reinforcement spacing is also closely related to concrete cover. Concrete cover functions to:

• Protect the steel from corrosion
• Maintain the structure's resistance to weather and environmental conditions
• Extend the life of the building

If the spacing of the reinforcement bars is incorrect, the concrete cover can become too thin or uneven.

6. Standard Reinforcement Spacing in Construction Practice
In general, the spacing of reinforced concrete bars must comply with:

• Working drawings and structural details
• Applicable technical standards (SNI)
• Load and structural function calculations

Changing the spacing of reinforced concrete bars without recalculation can eliminate the structural safety factor.

Conclusion
Reinforcement spacing has a significant impact on:

Structural strength

Concrete crack control

Durability and lifespan of the building

Both spacing that is too wide and too close together pose risks. Therefore, proper spacing of reinforcement bars is key to a safe and strong concrete structure.

Use Quality Reinforcement for Optimal Structural Results
PT Intisumber Bajasakti provides quality reinforced concrete, meeting SNI standards, with a stable supply to support various construction project needs.

📞 Phone: 021-66675999
🌐 Website: intisumberbajasakti.com
✉️ Email: info@intisumberbajasakti.com

Contact our team now for a consultation on your rebar needs and the best material solutions for your project.

Back to List