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EARTHQUAKE RESISTANT BUILDINGS Estimation of the spacers’ quantity

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February 25, 2023

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Estimation of the spacers’ quantity

If there is no other rule to follow when calculating the spacers of the formwork, one could use the empirical rule presented below:

RULES FOR ESTIMATING THE QUANTITTIES OF SPACERS AND REBAR CHAIRS

Superstructure and foundation beams: (2m of ‘linear spacers + 2 ‘pieces of point support’) in

every meter of ‘clear beam length’

Columns:    (8 ‘pieces of point support’) per column

Shear walls:    2m of ‘linear spacers’ in every meter of the shear wall’s length

Foundation slabs and footings:    (1.25m of ‘linear spacers’) in every square meter of ‘clear

slab area’

Slabs’ free edges:        (1m of ‘linear spacers’ + 1m of ‘rebar chairs’ + 1 ‘piece of point support’) in every edge meter

Slabs’ supports:    1m of ‘rebar chairs’ per meter of ‘every slab support’

• 1 m of ‘linear spacers’ might be 1 m of a plastic spacer, or 5 special formed spacers, or any other number of local spacers, etc.
  
• 1m of ‘rebar chairs’ might be 3 four-legged point spacers, or 1m of a folded wire mesh, or 2 pieces of impromptu steel rebar chairs, etc.
  
• 1 ‘piece of point support’ might be a properly formed plastic or concrete point support, or a peg, etc.
  

Foundation

Footings of the strip and the spread footing foundation: linear spacers with thickness equal to 4.0cm:

[4,40 x 1,00 +5,00 x 0,85 +2 x 0,15 x 1,00] x 1,25 = 11,20 m

Connecting beams:

linear spacers of 4,00 cm: 2 x 4,20 x 2,00 = 16,80 m

point spacers of 4,00 cm: 2 x 4,20 x 2,00 ≈16 pieces

Basement

Columns:    8 x 4 = 32 pcs. of point support

Shear wall:    3,60 x 2,50 x 2 = 18,00 m of linear spacers with thickness equal to 2,50 Beams:    (2 x 4,20 +3,60) x 2,0 = 24,00 m of linear spacers equal to 2,50 cm

(2 x 4,20 +3,60) x 2,0 = 24 pieces of point spacers equal to 2,50 cm

Slab:    3,90 x 4,50 x 1,25 ≈ 22,00 m of linear spacers with thickness equal to 2,50

Ground floor

Columns:    8 x 4 = 32 pcs. of point support

Beams:    2 x 4,20 x 2,0 = 16,80 m of linear spacers equal to 2,50 cm

2 x 4,20 x 2 ≈ 16 pieces of point spacers equal to 2,50 cm

Slab:    3,80 x 5,00 x 1,25 = 23,80 m of linear spacers with thickness equal to 2,50 cm Slab’s free edges:

3,60 x 1,00 x 2 = 7,20 m of linear spacers with thickness equal to 2,50 cm 3,60 x 1,00 x 2 = 7,20 m rebar chairs with height equal to 11,0 cm

3,60 x 1,00 x 2 ≈ 8 pieces of point spacers equal to 2,50 cm

Quantities sum:    m

pieces