maximum and minimum spacing of Beam, Column, Slab & Footing

What is the minimum bar spacing in reinforced beams according to IS 456?

The minimum horizontal spacing between two parallel main bars shall be diameter of larger bar or maximum size of coarse aggregate plus 5 mm. However, where compaction is done by needle vibrator, the spacing may be further reduced to two-third of the nominal maximum size of the coarse aggregate.

The minimum vertical distance between two main bars shall be

(a) 15 mm,
b) two-third of the nominal size of coarse aggregate, or
(c) maximum size of the bar or whichever is greater
Generally the spacing between two bars in beams depends upon maximum aggregate size used for concrete. Minimum spacing between two bars can be taken as approximately 50–75 mm.

spacing of stirrups in beam formula

According to cl. 26.5.1.5 of IS 456, the maximum spacing of the stirrups = 0.75 d = 0.75 (450) = 337.5 mm = 300 mm (say). So, we select 10 mm, 2 legged stirrups @ 145 mm c/c.

minimum spacing of stirrups in a rectangular beam

Maximum Spacing of Vertical Stirrups in a rectangle beam is at its Midspan.

It's because the Shear force at the Midspan is very less and We use Vertical Stirrups to counter shear force.The spacing of Vertical Stirrups is minimum near the Supports due to Maximum shear force at the Supports.

Spacing of Vertical Stirrups should not exceed-

1. 0.75d
2. 300mm

The criteria for fixing the vertical stirrup spacing in a structural member is provided in IS: 456 which shall not be more than least of the below-

a) least lateral dimension

b) Sixteen times the dia of the smallest longitudinal bar.

c) 300 mm.

maximum spacing of reinforcement in beam as per is code

Normally these 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. (ii) The maximum spacing between two secondary parallel bars shall be 5dor 450 mm or whichever is less

minimum spacing of bars in column

The minimum spacing between two reinforcementbars should be at least equal to the maximum aggregate grain dimension with a margin of 5 mm. For Greece, the maximum aggregate grains dimension for usual concrete, is 32 mm and for self compacting concrete is 16 mm.

maximum spacing of reinforcement in column as per is code

Normally these 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. (ii) The maximum spacing between two secondary parallelbars shall be 5dor 450 mm or whichever is less.

minimum spacing of bars in slab

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

maximum spacing of reinforcement in slab as per is code

the maximum spacing between two parallel mainreinforcing bars in case of RCC Slab shall be 3d or 300 mm or whichever is less. the maximum spacingbetween two secondary parallel bars in case of RCCSlab shall be 5d or 450 mm or whichever is less.

Maximume between bars in tension:

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

• 3 times the effective depth of slab
• 300 mm

2. 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 slab
• 450 mm

minimum spacing of bars in footing

Minimum spacing between reinforcement bars

The minimum spacing between two reinforcement barsshould be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. For Greece, the maximum aggregate grains dimension for usual concrete, is 32 mm and for self-compacting concrete is 16 mm

maximum spacing of reinforcement in footing as per is code

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