Minimum spacing of 2- bars in column, beam, slab

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Minimum spacing of 2-
bars in column, beam,
slab

Question Posted / dhanani.h.k.

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Minimum spacing of 2- bars in column, beam, slab..

Answer / mayank jain

Minimum Distance Between Individual Bars
main reinforcing bars shall usually be not-less
than the greatest of the following:
The following shall apply for spacing of bars:

a)The horizontal distance between two parallel
Minimum Distance Between Individual Bars
main reinforcing bars shall usually be not-less
than the greatest of the following:

1. The diameter of the bar if the diametera are
equal,
2. The diameter of the larger bar if the
diameters are unequaI, and
3. 5 mm more than the nominal maximum size
of coarse aggregate.

Greater horizontal distance than the minimum
specified in (a) should be provided wherever
possible. However when needle vibrators are
used the horizontal distance between bars of a
group may be reduced to two-thirds the
nominal maximum size of the coarse aggregate,
provided that sufficient space is left between
groups of bars to enable the vibrator to be
immersed.

Where there are two or more rows of bars, the
bars shall be vertically in line and the minimum
vertical distance between the bars shall be
15 mm, two-thirds the nominal maximum size
of aggregate or the maximum size of bars,
whichever is greater.

Maximum Distance Between Bars in Tension

Unless the calculation of crack widths shows that a
greater spacing is acceptable, thefollowing rules shall
be applied to flexural members in normal internal or
external conditions of exposure.
a) Beams - The horizontal distance between
parallel reinforcement bars, or groups, near the
tension face of a beam shall not be greater
than the value given in Table 15 depending on
the amount of redistribution carried out in
analysis and the characteristic strength of the
reinforcement.

Slabs

The horizontal distance between parallel main
reinforcement bars shall not be more than three
times thl effective depth of solid slab or
300 mm whichever is smaller.
The horizontal distance between parallel
reinforcement bars provided against
shrinkage and temperature shall not be more
than five times the effective depth of a solid
slab or 450 mm whichever is smaller.

Is This Answer Correct ?

34 Yes

7 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / shree.manthalkar

150 mm

Is This Answer Correct ?

32 Yes

24 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / mitch

The minimum clear spacing between parallel bars in a layer shall be db(diameter of bar) but not less than 25mm. [see sec. 407.7 NSCP 2010 for Spacing limits for reinforcement.]

Is This Answer Correct ?

11 Yes

5 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / krupal

75mm

Is This Answer Correct ?

8 Yes

7 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / ashwin

200 mm

Is This Answer Correct ?

2 Yes

3 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / rothansanga

Should not exceed 200mm

Is This Answer Correct ?

3 Yes

5 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / manikanta p

Maximum use of steel in construction 50mm bar, and using of aggregate 20mm
Bar center to bar center minimum of spacing 50mm
Bar inner to inner 25mm minimum spacing required

Is This Answer Correct ?

0 Yes

2 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / m jain

=maximum aggregate size eg. 12mm,20mm

Is This Answer Correct ?

13 Yes

16 No

Minimum spacing of 2- bars in column, beam, slab..

Answer / abdul majeeth

Column-150mm
beam-100mm
slab-100mm