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Estimating Steel Bar Quantity for Construction

Planning quantity for steel bars in each development is an arduous work. It needs a talented and experienced quantity assessor, estimators or engineers to make one. Each area, sub-segment, and parts of the plans with fortifying bars ought to be incorporated as missing one would be exorbitant and ruinous over the long haul.

Mat Foundation

The accompanying should help engineers on focuses to consider in deciding the strengthening bar quantity for matt foundation.

  • Anticipate on the off chance that it is required to utilize fortifying bars for formworks and platforms for help and strength.
  • Check the designs for the base and top bars' spacing, length, and width. Think about the hooks and curves on each of the two sides as planned and add it to he complete length.
  • Inspect the arrangement for structured splicing lengths and add it to the complete length. Splicing is the connecting of two distinctive strengthening bars to accomplish the necessary absolute length.
  • Examine the arrangement for different bars required state, seat bar. Because of the protracted tallness of mat foundation, planners use seat bars as solid spacers to isolate top bars and base bars.

The following is an example count for mat foundation rebar quantity.


  • t =1.00 m
  • W = 100 m
  • L = 100 m
  • S = 0.3 m

Business length per fortifying bars = 12 l.m. , (to be deducted with splicing length @ 0.8m)

Top bars

Transverse quantity = W/s= 100/0,3=333.3,say 334 pcs100 l.m.

100 + t + t = 100 + 1 + 1 = 102 l.m., 334 pcs (Additional length for hooks)

334 X 102 = 34,068 all out straight meter

(All out straight meter)/(business length-splicing)= 34,068/(12-0.8)=3,042 pcs-12meter length strengthening bars

Longitudinal quantity = L/s= 100/0,3=333.3,say 334 pcs100 l.m.

100 + t + t = 100 + 1 + 1 = 102 l.m., 334 pcs (Additional length for hooks)

334 X 102 = 34,068 all out direct meter

(All out direct meter)/(business length-splicing)= 34,068/(12-0.8)=3,042 pcs-12meter length strengthening bars

Total Quantity for TOP BARS

Transverse QTY + Longitudinal QTY = 3,042 + 3,042 = 6,084 pcs ? 12mL fortifying bars

Computing base bars is equivalent to the top bars.


Here is a guide on deciding the quantity for strengthening bars for column.

  • Scrutinize the arrangement for fortifying bars distance across, grade, and length per floor level. Remember to include the extra length from the foundation to the ideal floor level lines ought to there be a requirement for dikes.
  • Add the curve's length per end to the underlying level-to-level length. This is relevant for fundamental bars and additional bars.
  • For the ties, think about the curves, seismic hooks and all out border (less the balances) of the column. Most quantity assessors and estimators tally the ties per column as some column might be longer than the other column.
  • Check the column ought to if there are extra bars required and include the necessary rate for wastage.

Test computation for columns:


W = 0.4 m

L = 1.0 m

H = 3.0 m

Primary bar pcs. = 16

Absolute number of ties = 20 pcs.

Business length of strengthening bars = 8.0 l.m.

Primary bar

  • Length = H + hooks per closes = 3.0 m + 0.4 + 0.4 = 3.8 m (accepted length for hooks)
  • Absolute Length for primary bar = L x no. of pieces = 3.8 x 16 = 60.8 l.m.
  • Absolute number of pieces = (Total Length)/(Commercial Length)= 60.8/8=7.6,say 8 pcs-8meter Length rebar

Strengthening Ties

Length per ties is the border, P = 2W + 2L = 2(0.4) + 2(1.0) = 2.8 m

Absolute length = Length x No. of ties = 2.8 x 20 = 56 straight meter

Absolute number of pieces = (Total length)/(Commercial length) 56/8=7 pieces-8 meter length rebars

Slab on Grade

The accompanying methodology will help engineers on deciding the quantity of strengthening bars in slab on grade.

  • Check the region of the slab on grade and investigate the arrangement cautiously.
  • Some territory, particularly close to the steps, may require dowels. Include the necessary dowels and its length according to planned arrangement.
  • Add the hooks and splicing (as talked about above) to the all out length. Observe that splicing lengths for matt foundation may vary to the splicing of slab on grade.
  • Some slab on grade might be thickened close to dividers or entryway openings. Examine ought to there be varieties to seismic hooks and twists.
  • Add the necessary rate wastage to the complete registered amounts.

Sample figurings are given below.

Temperature bars

L = 10.0 m

W = 10.0 m

t = 0.6 m

s = 0.25 m

Business length of strengthening bars = 12.0 l.m.

Transverse bars

(same figuring for longitudinal bars since this is a square SOG)

No. of pieces = W/s= 10/0.25= 40 pieces-12 straight meter

Complete number of pieces = Transverse + Longitudinal = 40 + 40 = 80 pcs ? 12 straight meter strengthening bars

Suspended Slab

The accompanying aide should assist you with deciding the required strengthening bars for suspended slabs.

  • Determine the tops bars spacing according to transverse and longitudinal bars.
  • Add the hooks and splicing to the length as computed above.
  • Any openings like steps opening ought to be deducted to the figurings.
  • Examine the arrangement if there are twists because of progress in floor heights. Suspended slabs that are related with water are basically brought down at any rate an inch from the remainder of the whole floor like solace rooms and patios.
  • Having been brought down, there may likewise be changes to the basic subtleties of the slabs. These curves ought to be remembered for the estimations of the strengthening bars.
  • Add the required dowels for stone work works like dividers and solid railings on the all out quantity.
  • Multiply the necessary rate arrangement for the wastage factor.
  • Quantity estimation for suspended slab is actually the equivalent with the slab-on-grade and mat foundation.
Estimating Steel Bar Quantity for Construction