How do you calculate roof reinforcement?

The quantity is done in two steps.

1. (Calculation of Bars No’s) First, calculate the number of bars required (main and distribution both). FORMULA = (Total length – Clear cover)/center to center spacing + 1. Main bar = (5000 – (25+25))/100 + 1.
2. (Cutting length) MAIN BAR: FORMULA = (L) + (2 x Ld) + (1 x 0.42D) – (2 x 1d)

How are slab reinforcement bars calculated?

Layout of Rebar for Concrete Slabs

1. Convert your longitude measurement into inches: 15 feet x 12 inches per foot = 180 inches.
2. Divide your result by the spacing measurement: 180 in / 14 in = 12.87 (round up to 13)
3. Add one rebar to your result: 13 + 1 = 14.

How do you calculate bars in a slab?

Formula = (total length – clear cover)/center to center spacing + 1 main bar, = (5000 – (25+25))/100 + 1, = 4950 divided by 100 + 1, = 51 bars., distribution bar = (2000 – (25+25))/125 + 1, = 1950 divided by 125 + 1, = 17 bars.

What is Main Bar and distribution bar in slab?

Main Reinforcement Bars are used to transfer the bending moment developed at the bottom of the slab. Distribution Bars are used to hold the slabs on either way and to resist the cracks and shear stress developed at the top.

How do you calculate bar spacing on a slab?

The minimum and maximum spacing reinforcement in concrete structural members such as beams and slabs are required as per standard codes….1. Minimum Spacing between Bars in Tension

1. 15 mm,
2. Two-third of the nominal size of coarse aggregate, or.
3. Maximum size of the bar or whichever is greater.

How do you calculate reinforcement of a beam?

Example of Beam Reinforcement Calculation:

1. Length of B1 = clear distance between walls + 2 x width of walls – 2 x bar cover + 2 x bend length.
2. Length of bar B2: A + B + C = 4000 + 2 x 230 – 2 x 40 + (1.414xH – H)
3. B2 = 4000 + 2 x 230 – 2 x 40 + (1.414×334 – 334) = 4518.3 = 4520mm.

How do you calculate bars?

How to Calculate Weight of Steel Bars?

1. Also Read: Estimation of Steel Reinforcement for slab,beam and column.
2. Weight of steel Flat bar = (Length x width x thickness) x 7850.
3. Example 1: Determine the unit weight of MS Flat bar of width 40mm and Thickness of 20mm.
4. Weight of steel bar = Volume of steel Bar x Density of steel.

How do you calculate the number of bars?

How to calculate number of steel bars in column

1. Put that percentage of steel and Gross area of column in Load formula.
2. Determine the permissible stress in steel in compression.
3. Calculate Area of Steel required.
4. Calculate No. Of bars = (area of steel÷area of a single bar).

How do you calculate the number of bars on a slab?

Number of Required Bars Formula = (Length of slab / spacing) + 1 Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos Step 2

What is the size of the rebar on the slab?

OnCenter – the on-center spacing between rebar, which defaults to 18″ inset – an offset distance from the side of the slab to the first row the rebar grid, which has a default of 3″ size – this is the size of the rebar. The standard sizes include: 3-11,14,18

How do you calculate rebar cost?

Rebar Cost Estimate (New): This computes the estimated cost of rebar based on the total length of rebar, the length of the pieces (rebar sticks) and the per piece (stick) price. Weight of a Length of Rebar: This lets the user enter any length and select a size of rebar.

What is the lapping factor of a rebar?

( LF) The lapping factor is the multiple of the diameter of the rebar to specify the lapping distance. 40 (default) and 60 are common. Weight of Rebar: The calculator returns the total weight of the rebar in pounds. However, this can be automatically converted into other weight units (e.g. kilograms or tons) via the pull-down menu.