What is the formula for rebar calculation?

The formula for calculating the weight of rebar is calculated mathematically by the volume and multiplied by the density. The "square of the radius" is expressed as "the square of the diameter divided by 4", and the weight of 1 meter is calculated directly by numbers, except for the diameter, and the weight of 1 meter is "kilogram (millimeter squared)] multiplied by the square of the diameter.

Let the diameter of any steel bar be d, and the weight per meter is g1=7850*d*d* (kg), and the weight per meter of steel bar with a diameter of 10 mm is g2=7850* = (kg)g1 g2=d*d (shift g1=g2*d*d because g2=.)

Therefore, g1=6170*d*d (the unit of d is meters), and if the unit of d is millimeters, then there is g1=

Weight = volume gravity.

Volume = cross-sectional area Length.

Therefore, if you know the type and diameter of a batch of steel bars, you can use the above formula to calculate the weight.

However, the steel bars are generally ribbed, and the cross-sectional area is a little wrong with the circle area. You can check the "Code for Design of Concrete Structures".

To obtain the area and gravity, the bridge can be checked in the "Highway Reinforced Concrete and Prestressed Concrete Bridge and Culvert Design Code".

1. Square steel. Weight per m = side width Side width.

2. The weight of hexagonal steel per m = the diameter of the opposite side and the diameter of the opposite side.

3. Octagonal steel weight per m = diameter diameter.

4. Rebar.

Weight per m = diameter diameter.

5. Weight per m of angle steel = side width + side width - side thickness) side thickness.

6. Weight per m of flat steel = thickness and width.

7. Seamless steel pipe.

Weight per m = wall thickness (outer diameter - wall thickness).

8. Weight per m of welded steel = seamless steel pipe.

Remark. 1. Angle steel, I-beam.

The exact calculation formula of channel steel is very complicated, and the simplified table is used to calculate the approximate value.

2. F-value: general models and those with A, B, and C.

3. E value: general models and those with A, those with B, and those with C.

4. Units of length.

All in millimeters. Theoretical weight table of rebar.

The calculation formula is as follows:

The formula for calculating the specific gravity of the steel bar is: x*x* is the diameter of the steel bar) For example: 6 centimeters of steel bar is: 6 * 6 * 10 centimeters per meter of steel bar per meter is: 10 * 10 * per meter It should be like this!

I hope it will be helpful to you.

Multiply the square of the diameter by a few meters.

The formula for calculating reinforcement is as follows:

1. Column reinforcement.

1. The single length of the column longitudinal bar = the interpolation bar of the column foundation + the net height of the column + the anchorage length + the lap length * the number of laps.

2. Stirrups: single length = (b-2c+h-2c)*2+2*max(10d,75).

Second, the beam reinforcement.

1. The length of the longitudinal reinforcement at the upper part of the beam = total net span length + left anchorage + right anchorage + lap length * number of laps. Lap length: If it is a mechanical connection or a welded connection, the lap length is 0.

2. The length of the lower rib = net span length + left anchorage + right anchorage + lap length * number of laps.

3. Negative reinforcement of the upper end support: the first row = 1 3 net span length + left (right) anchorage length.

4. Negative reinforcement of the upper middle support: the first row = 1 3 net span length * 2 (the net span length is the maximum value of the adjacent two spans) + the width of the support.

Second row = 1 4 net span length + * 2 (net span length takes the maximum value of two adjacent spans) + support width.

5. Single length of erection bar = net span length - net span length 3*2 + 150*2.

6. Stirrups single length (2 limb hoops) = (length - 2 guarantees + width - 2 protection) * 2 + 2 * max (10d, 75).

7. Side longitudinal reinforcement (waist bar). The length of the structural reinforcement (the reinforcement starting with g) = the net span length + 2*15d. Torsion tensel length (n rebar at the beginning) = net span length + 2 * anchorage length.

8. Tension reinforcement: When the beam width is 350, the diameter of the tension bar is 6.

9. Additional suspension bar: single length of suspension bar = secondary beam width + 2 * 50 + 2 * (beam height - 2 protection) sin45 ° (sin 60 °) + 2 * 20d.

When the girder is 800 high, the angle of the suspension bar is 45 degrees; When the main beam is 800 high, the angle of the suspension bar is 60 degrees.

10. Roof frame beam: The upper part of the roof beam is long rib = total net span length + left anchorage + right anchorage + lap length * number of laps.

The square of the diameter is multiplied by the length and then multiplied by the coefficient, and the length and diameter of the steel bar are measured separately by relevant tools, for example, the diameter of the steel bar is 4 mm, and its length is 10 meters, and the weight can be calculated by applying the formula to 4*4*10*Jane punch.

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which has a circular cross-section and sometimes a square with rounded corners. Including round steel bars, ribbed steel bars, and torsion steel bars.

The steel bar for reinforced concrete refers to the straight bar or wire strip steel used for reinforced concrete reinforcement, and its shape is divided into two types: light round steel bar and deformed steel bar, and the delivery state is straight bar and disc round.

The light round steel bar is actually a small round steel and a disc circle of ordinary low carbon steel. Deformed steel bars are ribbed steel bars with a surface, usually with 2 longitudinal ribs and transverse ribs evenly spaced along the length. There are three types of transverse ribs: spiral, herringbone, and crescent.

It is expressed in millimeters of nominal diameter.

20mnsi、20mnv、25mnsi、bs20mnsi。Steel bars are mainly subjected to tensile stresses in concrete.

Due to the action of ribs, the deformed steel bar has a greater bonding capacity with concrete, so it can better withstand the action of external force. Judged steel bars are widely used in various building structures. Especially large, heavy, lightweight, thin-walled and high-rise building structures.

The square of the diameter is multiplied by the length and then multiplied by the coefficient, and the length and diameter of the rebar are measured separately using the relevant tools, for example, the diameter of the rebar is 4 mm, its length is 10 meters, and its weight can be calculated as 4*4*10*.

Screw anchors are used at both ends of the low-alloy steel bars.

, the prestressed steel bar is reduced according to the length of the reserved channel, and the screw is calculated separately. One end of the low-alloy steel bar adopts a head insert, and the other end is a prestressed steel bar when the screw anchor.

The length is calculated according to the length of the reserved hole, and the screw is calculated separately. When one end of the low-alloy steel bar adopts the head insert, and the other end adopts the stick anchor, the prestressed steel bar increases, and the prestressed steel bar increases when the two ends use the stick anchor.

The use of rebar is contraindicated.

In the construction, it is confirmed that the construction site is not able to ** the type and specification of the steel bar required by the design drawing, and the replacement of the steel bar according to the existing conditions is allowed. Before substitution, fully understand the design intent, component characteristics and replacement reinforcement performance, and must obtain the consent of the design unit to handle the change documents.

After the substitution, it can still meet the relevant calculation requirements of various limit states, as well as the necessary reinforcement construction regulations (such as stressed reinforcement and stirrups).

minimum diameter, spacing, anchorage length, percentage of reinforcement and concrete cover.

thickness, etc.), in general, the replacement reinforcement must also meet the requirements of cross-section symmetry.

Components with high crack resistance requirements (e.g. crane girders.

Thin belly beams, roof truss lower chords, etc.), it is not advisable to replace HRB335 and HRB400 deformed steel bars with HPB30O smooth steel bars, so as to avoid the cracks being too wide.

The above content refers to Encyclopedia - Reinforcement.

The reinforcement calculation includes: upper through bar, bearing negative bar, lower bar, waist bar, tension bar, stirrups, hanging bar, etc.

1. The length of the upper through rib, the length of the net span, the anchorage value of the first and last end supports. The upper through bar refers to the upper row of steel bars that run through the entire length of the member. When there is a negative moment reinforcement at the upper part of the support of the beam, the erection reinforcement can only be arranged in the middle part of the beam, and the two ends are lapped or welded with the negative moment reinforcement.

When lapping, it is also necessary to meet the requirements of lap length and should be lashed.

2. The length of the negative reinforcement of the support: the first row is the anchorage value of the support at the 3rd end of LN. The negative reinforcement of the bearing refers to the longitudinal stressed steel bar located in the upper part of the beam support to bear the negative bending moment force, commonly known as the flat stretch bar and the compression beam iron.

In some places, this is called a cover bar. The first row is: the span net span length + (ln 3 + front middle support value) + (ln 3 + rear middle support value); The second row is:

The clear span length of this span + (ln 4 + front intermediate support value) + (ln 4 + rear intermediate support value).

3. The length of the lower steel bar, the net span length, and the anchorage value of the left and right supports. Double-layer two-way reinforcement is a construction term that mainly refers to two-way, that is, the longitudinal and horizontal direction reinforcement of bottom reinforcement and gluten, that is, the reinforcement is arranged in the X and Y directions of the bottom plate and panel, and each layer of reinforcement is in both vertical and horizontal directions. For surface reinforcement, the short bar should be placed on top and the long bar below the short bar.

Generally, if a double-layer two-way steel bar is set, the negative reinforcement of the plate can not be set.

Questions. <>

The formula for calculating the weight of rebar is calculated mathematically by the volume and multiplied by the density.

Let the diameter of any steel bar be d, and the weight per meter is g1=7850*d*d* (kg).

Whereas, the weight per meter of 10 mm diameter rebar is g2 = 7850* = (kg).

g1 g2=d*d (shifting g1=g2*d*d.)

Because g2=. Therefore, g1 = 6170 * d * d (d is in meters).

If d is measured in millimeters, then there is g1=.

1. The weight of the steel bar = the length of the steel bar (in meters) multiplied by the weight of the steel bar per meter. The length of the steel bar can be obtained by turning over the sample, and the weight of the steel bar per meter can be checked for relevant information.

2. The weight of the steel bar per meter = diameter * diameter.

3. You can check the construction manual, which has a detailed **, and you can also check the hardware manual.

4. For commonly used, there are the following data, which should be memorized:

Summary. Rebar refers to the steel used for reinforced concrete and prestressed reinforced concrete, and its cross-section is usually round, sometimes square with rounded corners, and the delivery state is straight and round. Generally speaking, the formula for calculating the weight of the rebar is:

Rebar weight (W, unit kg) = Rebar diameter (d, unit mm) * Rebar diameter (D, unit mm) * Rebar length (L, unit m), i.e. w = d * d *.

Rebar refers to the steel used for steel-sensitive pre-reinforced concrete and prestressed reinforced concrete, and its cross-section is usually round, sometimes square with rounded corners, and the delivery state is straight bar and disc round. Generally speaking, the calculation formula of the weight of the reinforcement is: the weight of the reinforcement (w, unit kg) = the diameter of the reinforcement (d, the unit mm) * the diameter of the reinforcement (d, the unit mm) * the length of the reinforcement (bridge object l, the unit m), that is, w = d * d *.

At the solid state at room temperature, we say that the density of steel is grams of cubic centimeters. However, since steel is a general term for iron-carbon alloys with a carbon content and mass percentage between to, the chemical composition can vary greatly, so the density of different steel grades will be slightly different. For example, the density of gray cast iron is, 4, the density of cast steel, the density of industrial pure steel, and the density of stainless steel

5 and so on. Rebar weight calculation formula: diameter mm diameter mm length m steel pipe weight calculation formula: (outer diameter - wall thickness) wall thickness mm length m round steel weight calculation formula formula:

Diameter mm Diameter mm Length m Square Steel Weight Calculation Formula: Edge Width (mm) Side Width (mm) Length (m) Hexagonal Steel Weight Calculation Formula: Opposite Side Diameter Opposite Side Diameter Length (m).

Encyclopedia of reinforcement calculation formulas

1. The upper part is through the rib.

The length of the upper through bar (upper through bar 1) The length of the net span of the through span The anchorage value of the first and last end supports.

2. Negative reinforcement of the end support.

The length of the negative reinforcement of the end support: the first row is the anchorage value of the ln 3 end support; The second row is the anchorage value of the LN 4 end supports.

3. a lower steel bar.

The length of the lower reinforcement The net span length The anchorage value of the left and right supports.

Note: The calculation result of the lower reinforcement is the same regardless of whether it is arranged or not, so we can not enter the arrangement information when marking the lower skin longitudinal bar of the beam.

The above three types of steel bars all involve the problem of support anchorage, so how to realize the judgment on support anchorage in 03G101-1 in the software?

Now let's summarize the support anchorage judgment problems of the above three types of steel bars:

The width of the support is lae and , which is a straight anchor, and takes max.

The anchorage value of the end support of the reinforcement The width of the support lae or , is the bending anchor, take max.

The anchorage value of the intermediate support of the reinforcement is max

4. Waist tendons. Structural reinforcement: The length of the structural reinforcement is 2 15d in the net span of the long celery slag

Torsional reinforcement: The algorithm is the same as that of through reinforcement.

5. Stretching. Length of ribs (beam width 2 protective layer) 2 seismic hook value) 2d

Number of tendons: If we don't give the spacing of the tendons in the flat input, then the number of tendons (stirrup 2) (the number of construction ribs 2); If the spacing of the ribs is given, then the number of roots of the ribs Length of the ribs and the spacing of the ribs.

6. Stirrups. Stirrup length (beam width 2 protective layer beam height - 2 protective layer) 2

Number of stirrups (length of the encrypting zone, spacing between the encrypting zones+1) 2 (length of the unencrypted zone, spacing between the unencrypted zones 1)+1

Note: Because when the member deducts the protective layer, it is deducted to the outer skin of the longitudinal bar, then, we can find that the diameter value of the tension bar and stirrup is deducted at each protective layer; And when we calculate the length of the reinforcement in the budget, it is calculated according to the outer skin, so the software will automatically add the length of the extra deduction, so that the calculation of the reinforcement is increased by 2d, and the stirrup calculation is increased by 8d.

7. Suspension bars. The length of the hanging bar is 2 * anchorage + 2 * the length of the inclined section + the width of the secondary beam + 2 * 50, of which the height of the frame beam is 800mm angle = 60 °, 800mm angle = 45 °