It is believed that many people should have seen steel reinforcement. Steel reinforcement refers to steel for reinforced concrete and prestressed reinforced concrete. Its cross section is round and sometimes square with rounded corners. What is the theory of reinforcement weight table ? What is the formula for calculating the weight of steel? It is not clear to those who are not professional. Next, let's take a look at the reinforcement theory weight table and reinforcement weight formula knowledge!
Rebar weight calculation formula
Rebar weight calculation formula is as follows:
The theoretical weight of a steel bar with a diameter of d = d^2/100*0.617=d^2X0.00617, ^2 is a square, 0.617 is the theoretical weight of 10 steel bars with a diameter of 10 bars. Only the theoretical weight of 10 bars needs to be remembered. For the diameter of 12 or less, three decimal places are reserved; for the diameter of 12 or more, two decimal places are reserved; when it is retained, it is rounded up to six, and the bar diameter (mm) is multiplied by 0.00617.
Specific calculation method
1, square steel per m weight = 0.00786 × side width × width
2. Hexagonal steel weight per m = 0.0068 × diameter of the opposite side × diameter of the opposite side
3, octagonal steel weight per m = 0.0065 diameter diameter diameter
4, rebar weight per m = 0.00617 diameter diameter diameter
5, angle steel per m weight = 0.00786 × (edge ​​width + width - edge thickness) × edge thickness
6, flat steel per m weight = 0.00785 × thickness × width
7, seamless steel pipe per m weight = 0.02466 × wall thickness × (outer diameter - wall thickness)
8, the weight of welded steel per m = seamless steel pipe
Note
1. The exact calculation formula for angle steel, I-beam and channel steel is very complicated, and the list formula is used to calculate the approximate value.
2. The f-number: The general model is 3.34 with a, 2.65 with b, and 2.26 with c.
3. The e-value: The general model is 3.26 with a, 2.44 with b, and 2.24 with c.
4, each length unit is mm.
The calculation formula for the theoretical bar weight of steel bars is as follows:
Calculation example
Round steel rod (kg/m)
w = 0.006165 × d × d, d = diameter mm, diameter 100 mm round bar, for every m weight. Weight per m=0.006165×1002=61.65kg
Rebar (kg/m)
w = 0.00617 × d × d, d = section diameter mm.
Rebar 12 mm in diameter, for every m of weight. Weight per m = 0.00617 × 12 2 = 0.89 kg
Square steel (kg/m)
w= 0.00785 ×a ×a,a= side width mm
Square steel with a width of 20 mm, for every m of weight. Weight per m = 0.00785 × 202 = 3.14kg
Flat steel (kg/m)
w= 0.00785 ×b ×d,b= side width mm, d= thick mm
Flat steel with a width of 40 mm and a thickness of 5 mm, for every m of weight. Weight per m = 0.00785 × 40 × 5 = 1.57kg
Hexagonal steel (kg/m)
w = 0.006798 × s × s, s = distance to the side mm
Hexagonal steel with an edge distance of 50 mm is calculated for every m of weight. Weight per m = 0.006798 × 502 = 17kg
Octagonal steel (kg/m)
w= 0.0065 ×s ×s,s= Distance from side to side mm
For octagonal steel with an edge distance of 80 mm, calculate the weight per m. Weight per m = 0.0065 × 802 = 41.62kg
Equal angle steel (kg/m)
= 0.00785 ×[d (2b – d )+0.215 (r2 – 2r 2 )]
b= side width, d= edge thickness, r= radius of inner arc, r= radius of end arc
Find the weight per m of 20 mm × 4 mm equal angle steel. According to the metallurgical product catalogue, when r is 3.5 for a 4mm × 20mm equilateral angle steel and r is 1.2, then the weight per m = 0.00785 × [4 × (2 × 20 - 4 ) + 0.215 × (3.52 - 2 × 1.2 2 ) )]=1.15kg
Unequal angle steel (kg/m)
w= 0.00785 ×[d (b+b – d )+0.215 (r2 – 2 r 2 )]
b = long side width, b = short side width, d = edge thickness, r = inner radius, r = end radius
Calculate the weight per inch of 250 mm × 118 mm × 10 mm I-beam. From the manual of metal materials, find out that the I-steel t is 13, r is 10, r is 5, then the weight per m = 0.00785 × [250 × 10 + 2 × 13 × (118 -10) + 0.615 × (102 - 5 2 )]=42.03kg
Steel plate (kg/m2)
w= 7.85 ×d,d= thick
Thickness 4mm steel plate, for every m2 weight. Weight per m2 = 7.85 × 4 = 31.4kg
Steel pipe (including seamless steel pipe and welded steel pipe) (kg/m)
w= 0.02466 ×s (d – s ), d = outside diameter, s = wall thickness
Seamless steel pipe with an outer diameter of 60 mm and a wall thickness of 4 mm, for every m of weight. Weight per m = 0.02466 × 4 × (60 - 4 ) = 5.52kg
Rebar theoretical weight table
Multiply the bar diameter (mm) by 0.00617 times the length L
0.617 is the weight of round 10 rebar per meter. Rebar weight is proportional to the square of the diameter (radius).
G/m=0.617*D*D/100
Weight per kilogram (Kg) = Diameter of rebar (mm) × Diameter of rebar (mm) × 0.00617
In fact, it is also very simple to remember the weight of steel used in construction projects: see the table below.
Normally, the number of steel bars below Φ12 (including 12) and Φ28 (including 28) is taken to be three digits after the decimal point, and Φ14 to Φ25 are usually taken after the decimal point of steel bars to take two digits.
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