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What is the Difference between main bars and distribution bars in slab

What is the Difference between main bars and distribution bars in slab

Let us go through some of the FAQs to understand the main bars & distribution bars in a slab.

1. What are the main bars in a slab .?

slab

The reinforcement bars that are placed in the tension zone of the slab to resist the bending moment & to transfer the superimposed loads to the supports that are provided for the slab are called main bars.

Main bars are always placed at the bottom part of the slab reinforcement and distribution bars rest over the main bar as shown in the above drawing.

The diameter of the main bar should not be less than 8mm for the HYSD bar and 10mm for plain bars.

Learn More 

  1. How to Calculate the Unit Weight of Steel Bars | Bar Bending Schedule

  2. Column Reinforcement Detail | Lateral Reinforcement for Columns | Steel Reinforcement

  3. Estimating Of Steel Bar Quantity for Construction

 

2. What are the distribution bars in a slab .?

The reinforcement bars that are placed above the main bar in a one-way slab, to distribute the superimposed load to the main bar are called distribution bars.

one way slab

As you can observe in the above drawing, distribution bars are provided in the longer span of the one-way slab & main bars are placed along the shorter span of the slab.

The distribution bar helps to firmly hold the main bars in their assigned position. They also act against shrinkage stresses due to temperature variations.

3. Is distribution bars provided in a two-way slab .?

two way slab

The term distribution bar is sometimes used for the top reinforcement of all types of slabs. But in actuality, it is not correct in the case of a two-way slab as the load is transferred in both directions. So in the two-way slabs, the reinforcement provided in both the Lx & Ly directions should be called main bars.

4. What are the different functions of main bars in concrete .?

1. To transfer the superimposed loads to the supports.

2. To resist the bending moments.

3. To withstand shear stress in the tension zone.

4. To encounter shrinkage cracks due to temperature variation.

 

Learn More 

  1. Calculation Method For Find Out The Overlapping Length Of Beam, Column And Slab

  2. Bar Bending Schedule For Slab And Estimation Of Steel Reinforcement In Slab

5. What are the different functions of distribution bars in concrete .?

1. To distribute the superimposed load to the main bar.

2. To firmly hold the main bars in their given position.

3. To form a mesh with the main bar in concrete for better bonding strength.

4. To resist shrinkage stress due to climatic variation.

5. To resist the development of cracks due to external factors.

  1. How To Calculate The weight of Steel With Formula

  2. How to calculate the cutting length of reinforcement bars in circular R.C.C slab

 

6. What are the differences between main bars & distribution bars in a slab?

No.

Main bar

Distribution bar

1.

Used in shorter

direction.

Used in longer

direction of

one-way slab.

2.

Placed in bottom

part of slab

reinforcement.

Placed over the

top of the main

bar.

 

3.

Higher diameter  

bars are used.

Lower diameter

bars are used.

 

4.

Designed to

resist bending     

moment.

Not designed to

resist bending

moment.

 

5.

Transfers super

imposed load to  

the supports

Distributes super

imposed load to

the main bar.

 

6.

Resists shear stress

at the tension

zone.

Resists shrinkage

stress due to

climatic variation.

Thank you for going through this article. Have a good day

 

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About Raja Junaid Iqbal

Hi My name is Raja Junaid Iqbal and i am Land Surveyor by Profession but I've specialized in the field of Q,S and land development. As Professional Surveyor I engaged my self in all over the Gulf since 14 years.

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