Minimum And Maximum Spacing Of Beam, Column, Stirrups, Slab & Footing -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

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Jun 17, 2021

Minimum And Maximum Spacing Of Beam, Column, Stirrups, Slab & Footing

 

In this article, we explained Maximum And Minimum Spacing Of Beam, Column, Stirrups, Slab & Footing Which Will Be Use Full For Civil Engineers 

What Is The Minimum Bar Spacing In Reinforced Beams According To IS 456?

 

The minimum horizontal spacing between two parallel main bars must be the diameter of the larger bar or the maximum size of the coarse aggregate plus 6mm.

However, if compression is performed by a needle vibrator, the gap can be further reduced to 2/3 of the nominal maximum size of the coarse aggregate.


ALSO READ: Maximum Size Of Concrete Slab, Beam & Column | Calculation 


The minimum vertical distance between two main bars shall be

·       16 mm

·       2/3 of the nominal size of coarse aggregate

·       Maximum size of the bar In the beam

In general, the spacing between two bars in a beam depends on the maximum aggregate size used in the concrete. The minimum spacing between the two bars can be about 50–75 mm.

 

What Is The Maximum Bar Spacing In Reinforced Beams According To IS 456?

 

Normally this spacing will be as mentioned below:

·       For beams, these distances are 300 mm, 180 mm and 150 mm for grades of main reinforcement of Fe 250, Fe 415 and Fe 500, respectively.

·       The maximum spacing between two secondary parallel bars shall be 5d or 450 mm or whichever is less

 

 

What Is The Minimum Bar Spacing In Reinforced Column?

The minimum gap between two reinforcement bars should be equal to the maximum aggregate grain dimension with a margin of at least 5 mm. For greases, the maximum total grain dimension is 32 mm for normal concrete and 16 mm for self-compacting concrete.

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What Is The Maximum Bar Spacing In Reinforced Column According To IS 456?

 

Normally these spacing will be as mentioned below:


For beams, these distances are 300 mm, 180 mm and 150 mm for the main reinforcement classes of Fe 250, Fe 415 and Fe 500, respectively.

 

The maximum distance between the two secondary parallel bars should be 5D or 450 mm or whichever is less.



 

What Is the maximum Spacing Of Stirrups In Beam?

In rectangular beams, the maximum spacing of vertical stirrups is in the mid-span.

Minimum Bar Spacing In Reinforced Column

This is because the mid-span has very little shear and uses vertical stirrups to counteract the shear. The spacing of the vertical stirrups is minimal near the supports due to the maximum shear force of the supports.

 

Spacing of Vertical Stirrups should not exceed

·       0.75d

·       300mm

Criteria for fixing vertical stirrup spacing in structural members are given in IS:456 and should not be greater than the values below.

·       Least lateral dimension

·       Sixteen times the dia of the smallest longitudinal bar.

·       300 mm.


ALSO READ: Minimum Size Of Concrete Slab, Beam & Column 


What Is  Minimum Spacing Of Stirrups In Beam?

The formula for stirrups spacing in the beam

According to cl. 26.5.1.5 of IS 456,

Maximum spacing of the stirrups = 0.75 d

Example

Depth of beam 600

= 0.75 (600) = 450mm

So,

We select 10 mm, double legged stirrups @ 150 mm c/c.

 

 

What Is The Minimum Bar Spacing In Slab?

 

The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus the margin of 5 mm

 

Minimum Bar Spacing In Reinforced Column

 

 

What Is The Maximum Bar Spacing In Slab As Per IS-Code?


In the case of the RCC slab, the maximum spacing between the two parallel main reinforcement bars should be 3D or 300 mm or whatever. In the case of the RCC slab, the maximum spacing between two secondary parallel wires should be 5D or 450 mm or whatever.

 

The spacing of the main steel in a slab should not exceed the following:

·       3 times the effective depth of the slab

·       300 mm

 

The spacing of the bars provided to act as distribution steel or bars provided for preventing to temperature and shrinkage stresses shall not exceed the following:

 

·       Five-time the effective depth of the slab

·       450 mm


What Is The Minimum Bar Spacing In Slab As Per IS-Code?

The minimum gap between two reinforcement bars should be equal to the maximum aggregate grain dimension with a margin of at least 5 mm. For greases, the maximum total grain dimension is 32 mm for normal concrete and 16 mm for self-compacting concrete.

 

What Is The Maximum Bar Spacing In Footing As Per IS-Code?

 

The minimum reinforcement in the footing slab specified by the code is 0.12% and the maximum spacing specified is 3 times the effective depth or 450mm whichever is less.

 

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