Weight of hot rolled channel. Channel assortment GOST 8240-89
GOST channel - metal beams (hot-rolled profiles), in cross-section resembling the letter “P”.
The channel flanges are located on one side of the wall (unlike z-profiles, in which the flanges lie on opposite sides of the wall). They can be of different lengths, sizes, types, and inclinations. Therefore, before you buy a channel, you need to know exactly all the parameters that are necessary.
Hot-rolled channel GOST 8240-89 is widely used in the manufacture of buildings from metal structures.
The assortment of steel channels is an assortment of shaped rolled products, the cut of which is a continuous metal profile of a U-shaped section. Profile number P5-P24 is manufactured with dimensions in accordance with GOST 8240-89 (see the table of correspondence between the size and weight of the channel) from steel of various grades.
Hot-rolled steel is used to impart rigidity and stability to the structure in which its standard dimensions are used. Channels work well in bending and absorb longitudinal loads, thereby increasing strength and reducing the weight of the structure in the total weight.
Channels of various sizes are used for the manufacture of frames of metal structures, beams, columns, stairs.
What is the weight of the channel?
Study the correspondence table below “Channel. Size-mass.” This table shows the correspondence of channel dimensions and weights according to series P DSTU 3436-96 (GOST 8240-97).
The values for the weight of 1 m of channel and the quantity per ton in the table are given for reference, because calculations were made using the nominal dimensions of the width, length and thickness of the shelves. In practice, there are no ideal sizes. In accordance with GOST, deviations are allowed for each value, which in total can give up to a 5% increase in the actual weight of the channel. Rolled products with a weight less than the calculated one are rare.
The size and type of channel can be recognized by its marking, the number in the designation is the distance between the outer edges of the edges of the product (size h), measured in centimeters, the letter P indicates that the shelves are without slope and are parallel to each other if the edges are located at an angle , then the designation has the letter U. There are also channels in the markings of which there may be another letter, which indicates that this product is positioned as a light (type L), economical (type E) or special (C) model.
Channel mass table P - How much does 1 linear meter weigh?
| Channel series number P | Channel dimensions in millimeters | Weight of a meter of channel in kg | Number of meters per ton |
| h | b |
Source: https://sbk.ltd.ua/ru/sortament-ves-metalloprokata/129-shveller-gorjachekatanyj-gost-8240-89-razmery-i-ves.html
Channel 24
Channel 24 is an ordinary channel, a standard rolled metal product, which has a characteristic U-shaped rolled shape for a channel, but the dimensions of the width of the channel are indicated - they are equal to 240 mm.
That is, a more correct name for a channel of this size can be considered: channel 240 mm wide or channel number 24 (channels are often indicated by numbers, and the channel number is equal to its width in centimeters). However, channel width 24 is not the only feature that describes this type of channel.
It turns out that channels numbered 24 are different. And not at all green, blue, red, but differing in the height of the shelf and the slope of the internal edges. How to understand this?
Types of channel 24
There are two types of channel 24, they differ from each other in the slope of the inner faces of the channel. This can be seen more clearly in the drawing of channel 24.
channel drawing 24
Channel drawing 24
The first type of channel 24 is a modification called correctly: channel 24 with a slope of the internal edges of the shelves in accordance with GOST 8240-72. Channel 24 diagram in the photo.
channel drawing 24
Channel drawing 24
The second type of channel 24 is a modification called correctly: channel 24 with parallel flange edges in accordance with GOST 8240-72. Channel 24 diagram in the photo. ..
But that’s not all, as I already said, channel 24 can be made with different flange heights; in the drawing, the height of the channel flange is indicated by the letter c.
channel drawing 24
Drawing of channel 24 shelf 90
So channel 24, having a width of 240 mm, is produced either with a shelf height of 90 mm. The photo shows a drawing of channel 24, with a slope of the inner edges of the shelves.
channel drawing 24
Drawing of channel 24 shelf 95
Or with a shelf height of 95 mm. The photo shows a drawing of channel 24, with a slope of the inner edges of the shelves. ..
The story is similar for another type of channel with a flange width of 240 mm, a modification with parallel edges; it also comes in two manufacturing options: with a flange height of 90 and 95 mm.
channel drawing 24
Drawing of channel 24 with parallel edges and flange height 90 mm.
The photo shows a drawing of channel 24 with parallel edges and a shelf height of 90 mm.
channel drawing 24
Drawing of channel 24 with parallel edges and flange height 95 mm.
The photo shows a drawing of channel 24 with parallel edges and a shelf height of 95 mm.
Channel thickness 24?
The thickness of the channel 24 depends on its modification and in practice, when we talk about the thickness of the channel, we must understand that we are discussing the thickness of its wall.
In the drawings of channel 24 given above, at the beginning of the article, we see that its thickness is measured (dictated by GOST) in two places.
This is the wall thickness of the wide channel flange (what we call channel width 24) - S and the wall thickness of the narrow channel flange (what we call channel height 24) - t. So, as for the specific values of the thickness of channel 24, GOST defines the following values.
For channel 24 with a slope of internal edges, a width of 240 mm and a height of 90 mm, the thickness of the channel is determined by two values: S = 5.6 mm, t = 10.0 mm.
For channel 24 with a slope of internal edges, a width of 240 mm and a height of 95 mm, the thickness of the channel is determined by two values: S = 5.6 mm, t = 10.7 mm.
For channel 24 with parallel edges, width 240 mm and height 90 mm, the thickness of the channel is determined by two values: S = 5.6 mm, t = 10.0 mm.
For channel 24 with parallel edges, width 240 mm and height 95 mm, the thickness of the channel is determined by two values: S = 5.6 mm, t = 10.7 mm.
That is, as we see, despite the different shapes of the channels 24, they are quite well unified, which is convenient both in the manufacture of structures from the channel and in estimating its weight.
However, ATTENTION!!! When we call the thickness of a narrow wall for channel 24 with a slope of the internal edges of the flanges, then the thickness t turns out to be a conditional, average value chosen approximately in the middle of the flange edge.
Closer to the end of the narrow flange, the thickness of the channel decreases, and closer to the wide flange it increases. Look at the drawing of channel 24 - it’s clearly drawn there.
Channel area 24?
When talking about the area of this type of rolled metal, we can discuss either the cross-sectional area of the channel 24 or the surface area of the channel 24. People often ask why the surface area of the channel is needed? It seems that in the manufacture of structures it is not very important, is not taken into account in calculations and is not included as a parameter in formulas.
This is true, but one of the final stages of manufacturing structures from channel 24 is painting the metal structures with paint to protect them from corrosion. Channel 24 is no exception here. And in order to design and plan work on the manufacture of metal structures, we will need to draw up an estimate for painting in advance.
For this purpose, the surface area of the channel (1 linear meter) is useful in order to calculate the painting area of the channel. The area of channel painting, in turn, is related to the paint consumption per unit area and the timing of the work.
So you can calculate the painting area of channel 24 based on tabular data according to GOST - channel surface area.
But, much more often, we need a cross-sectional area of the channel 24. I note that depending on the angle at which the channel section is made relative to its axis, we will get completely different values of the cross-sectional area. In practice, usually only one type of section is used in calculations and formulas - transverse. When the section is made at an angle of 90 degrees to the channel axis. So, the cross-sectional area of the channel 24 depends on the specific modification of the rolled product.
For a channel 24 with a slope of internal edges, a width of 240 mm and a height of 90 mm, the cross-sectional area of the channel is = 30.6 sq.cm.
For a channel 24 with a slope of internal edges, a width of 240 mm and a height of 95 mm, the cross-sectional area of the channel is = 32.9 sq.cm.
For channel 24 with parallel edges, width 240 mm and height 90 mm, the cross-sectional area of the channel is = 30.6 sq.cm.
For channel 24 with parallel edges, width 240 mm and height 95 mm, the cross-sectional area of the channel is = 32.9 sq.cm.
Center of gravity of channel 24
Let's look again at the drawings. The center of gravity of a channel is a value that also depends on the specific modification (shape) of the channel. So, the center of gravity is distinguished for all types of channels, that is, if we have 4 different shapes of a channel, then for each of them the center of gravity will be different. Let's look at the drawing and extracts from GOST.
Here again is our channel 24 with a slope of the inner edges of the shelves. In the drawing at the beginning of the article, the center of gravity of the channel is indicated by the letter - Z0. Can you see it well? For channel 24, width 240 mm and height 90 mm, the center of gravity is equal to - 2.42 cm. And, for channel 24 with height 95 mm, the center of gravity will be equal to - 2.67 cm.
Here again is our channel 24 with parallel edges of the shelves. In the drawing at the beginning of the article, the center of gravity of the channel is indicated by the letter - Z0. Can you see it well? For channel 24, width 240 mm and height 90 mm, the center of gravity is equal to - 2.75 cm. And, for channel 24 with height 95 mm, the center of gravity will be equal to - 2.85 cm.
Channel radius 24
The channel has several radii, the value of which is also determined by GOST. R and r that are important for calculations and formulas are identified . See the drawing of the channel of the corresponding type. Now the tabular values of the channel radius for each of its modifications.
For channel 24 with a slope of the inner edges of the shelves, a width of 240 mm and a height of 90 mm, the radius R and r are respectively equal to 10.5 and 4.0 mm. And, for channel 24 with a height of 95 mm, the radius R and r are respectively equal to 10.5 and 4.0 mm.
For channel 24 with parallel flange edges, width 240 mm and height 90 mm, the radius R and r are respectively equal to 10.5 and 6.0 mm. And, for channel 24 with a height of 95 mm, the radius R and r are respectively equal to 10.5 and 6.05 mm.
Channel gyration radius 24
The radius of inertia of a channel is one of the quantities that depends not only on its shape, but also on the selected coordinate axis.
As we see in the photo of the drawing of channel 24, in mechanical engineering and the design of metal structures they mainly use 2 axes: XX and YY, where XX is the axis passing through the middle of the wide flange of the channel, perpendicular to the plane of the flange, and the YY axis passing through the center of gravity of the channel parallel to it wide shelf. So, the values of the radii of inertia of the channel 24 for different axes are designated according to the name of each of the axes: Rx and Ry .
For channel 24 with a slope of the inner edges of the shelves, a width of 240 mm and a height of 90 mm, the radius Rx and Ry are respectively equal to 9.73 and 2.60 cm. A, for channel 24 with a height of 95 mm, the radius Rx and Ry are respectively equal to 9.84 and 2.78 cm.
For channel 24 with parallel flange edges, width 240 mm and height 90 mm, the radius Rx and Ry are respectively equal to 9.01 and 2.77 cm. A, for channel 24 with a height of 95 mm, the radius Rx and Ry are respectively equal to 9.75 and 2.85 cm.
Channel weight 24
When asked the question - how much does channel 24 weigh, you need to clarify what exactly is meant. Usually, the question: how much does channel 24 weigh mean something slightly different, namely: the weight of a meter of channel 24 (otherwise, the weight of a linear meter of channel, linear weight of channel, specific gravity of channel, theoretical or calculated weight, sometimes called table weight of channel or weight of channel according to GOST - it’s all the same thing).
Indeed, as for any other types of rolled metal, for all channel numbers there are standard tabular values for the specific gravity of one linear meter of channel. As for the weight of channel 24, the mass of one meter (theoretical weight) depends not on its shape, but on its height.
That is, both the channel 24 with parallel edges of the shelves and the channel 24 with the slope of the internal edges of the shelves weigh the same, with the same height of the channel.
So, the width of the channel is 240 mm. If the height of the shelf is 904 mm, then the specific theoretical weight of channel 24 is = 24.0 kg. Once again, I draw your attention to the fact that this means how much one linear meter of channel 24 weighs according to GOST. The shape of the edges of the channel flanges does not matter; the weight of the channel is the same for both modifications.
So, the width of the channel is 240 mm. If the height of the shelf is 95 mm, then the specific theoretical weight of channel 24 is = 25.8 kg. Once again, I draw your attention to the fact that this means how much one linear meter of channel 24 weighs according to GOST. The shape of the edges of the channel flanges does not matter; the weight of the channel is the same for both modifications.
Source: http://4ypakabra.ru/shveller-24/
Calculation of channel for deflection and bending
Channel is probably the most popular rolled metal used in construction. Judge for yourself, it can be used as floor beams, stair stringers, lintels and many other building structures. The channel is also quite often used to strengthen structures.
:
1. Calculator
2. Instructions for the calculator
But as you know, you cannot thoughtlessly take this or that rolled metal product. After all, it happens that its largest cross-section cannot withstand the load placed on it . Therefore, if you want to use a channel in the construction of your structure, you must first calculate it for deflection and bending. And this calculator can help with this.
Calculation of a channel for deflection and bending (selection of channel number based on deflection and strength) in the calculator is carried out for the following design schemes:
- Type 2 - cantilever beam with rigid embedding and uniformly distributed load. Example: a canopy made by rigidly welding two channels to the wall on one side and filling the space between them with reinforced concrete.
- Type 3 - a simply supported beam on two supports with a cantilever with a uniformly distributed load. Example: floor beams that extend beyond the outer wall to support a balcony slab.
- Type 4 is a single-span simply supported beam with one concentrated force. Example: a lintel with a floor beam supported on it.
- Type 5 is a single-span simply supported beam with two concentrated forces. Example: a lintel on which two floor beams already rest.
- Type 6 - cantilever beam with one concentrated force. Example: Fantasy Parade - the same canopy as in type 2, only here there is a metal sheet between the channels on which a brick wall stands.
I would also like to talk about the features of this calculator. It lies in the fact that you can simultaneously select channels online by size and according to GOST standards.
Note: if you still need to calculate the weight of the channel and the cost of purchasing it, then here you go.
Instructions for the calculator
Please note that in non-integer numbers it is necessary to put a period, not a comma, that is, for example, 5.7 m, not 5.7. Also, if something is not clear, ask your questions through the comment form located at the very bottom.
Initial data
Calculation scheme:
Span length (L) - the span that the beam must span.
Distances (A and B) - distances from supports to places where loads are applied. In the case of the third scheme - the length of the console.
Standard and design loads are the loads by which the channel is selected for deflection and bending.
Comment. If you need to calculate a floor beam and your load is expressed in kg/m2, then you can convert it by multiplying by the pitch of the beams. For example, the design load on the floor is 400 kg/m2, the pitch of the beams is 0.6 m, then the load that needs to be indicated in the initial data column will be equal to 400·0.6=240kg/m.
F max is the ratio of the span length to a unit selected according to Table E.1 of SNiP “Loads and Impacts”, depending on the type of structure. The most common values for this parameter are shown in Table 1.
Number of channels - here you can select the number of channels that make up one beam. This means that the channels lie next to each other, and not on top of each other.
Position - the orientation of the channel in relation to the applied load (see figure).
Design resistance Ry - this parameter depends on the steel grade. For example, if the steel grade is C235, then Ry = 230 MPa. (Note: designers sometimes take Ry 210 MPa for reinsurance, since anything can happen in Russia). The most common values are listed in Table 2.
Next, you select a certain type of channel according to GOST (in this case it is GOST 8240-97), which needs to be checked for deflection and bending.
Result
The weight of the beam is 1 lm. channel This indicator allows you to estimate how much a beam of a given length will weigh.
W required is the required moment of resistance of the channel.
F max is the maximum deflection that is permissible for a beam spanning a span of length L.
Strength calculation:
Wbeams is the moment of resistance of the selected channel. This parameter can be simultaneously found out for channels with parallel edges, with sloped flanges, economical, special and light series channels.
Margin - here it is shown by how many percent the moment of resistance of the selected beam exceeds the required moment of resistance (positive value) or does not reach it (negative value). In other words, if the value is minus (-), then the beam does not pass in terms of strength, if it is plus (+), then it passes.
Deflection calculation:
Fbeams is the deflection that occurs in the selected channel under the influence of a standard load.
The margin is the same as in relation to the moment of resistance.
Source: http://svoydomtoday.ru/building-onlayn-calculators/285-raschet-shvellera-na%D0%BA%D0%B0%D0%BB%D1%8C%D0%BA%D1%83%D0% BB%D1%8F%D1%82%D0%BE%D0%B0
Channel 24U length 9 meters. Calculate Weight - Channel 24 Umm. Suppliers and prices
Prices for this size (length 9) can be viewed in the following regions: Arkhangelsk, Astrakhan and the region, Barnaul, Belgorod, Bryansk and the region, Buynaksk, Vladivostok, Vladikavkaz and the region, Vladimir Volgograd, Vologda, Voronezh and the region, Gorno-Altaisk, Grozny, Gudermes, Ekaterinburg, Essentuki, Zheleznodorozhny, Ivanovo and region, Izhevsk, Irkutsk, Kazan, Kaliningrad and region, Kaluga, Kemerovo, Kirov and region, Kostroma and region, Krasnodar, Krasnoyarsk, Kursk, Lipetsk and region, Lobnya, Magadan and region, Magnitogorsk, Makhachkala, Moscow, Murmansk, Naberezhnye Chelny, Nazran, Nalchik, Neftekamsk, Nizhnevartovsk, Nizhny Novgorod, Nizhny Tagil, Novokuznetsk, Novorossiysk, Novosibirsk and region, Novocherkassk, Nur-Sultan, Omsk and region, Orel and region, Orenburg, Penza and region, Perm, Petropavl. Kamchatsky, Pskov, Pyatigorsk, Rostov-on-Don, Ryazan and the region, Samara, St. Petersburg, Saransk, Saratov, Sevastopol, Sergiev Posad, Smolensk and the region, Sochi, Stavropol, Surgut, Syzran, Syktyvkar, Taganrog, Tambov and the region, Tver and region, Tolyatti, Tomsk, Tula, Tyumen, Ulan Ude, Ulyanovsk, Ufa, Ukhta, Khabarovsk, Khanty Mansiysk, Cheboksary, Chelyabinsk, Cherepovets, Chekhov, Elektrougli, Elista, Yuzhno Sakhalinsk, Yakutsk, Yaroslavl.
How to get profitable offers from suppliers Krasnodar
Channel No. 24U, 9 meters each
As a rule, in the construction field you can often encounter the fact that this or that material is needed right now and it doesn’t matter whether it is the city of Krasnodar or a completely different region. Today, to solve this problem, there is a special website that helps clients and customers find mutually beneficial cooperation. Want to know exactly how this happens?
Quite simple if you use the latest technology and the World Wide Web. So, you go to the website METAL100.ru and leave your application, let it be Channel No. 24U, 9 meters each, specify the region Krasnodar.
Although, it is worth noting that your search may not be limited only to the capital. These may be other regions of the Russian Federation, and with one click you can cover all cities of the CIS.
At this point, your work is almost finished, since the automatic system itself sends out mailings to suppliers. And they usually respond within 3 minutes.
It is after this period of time that you will begin to receive offers for Channel No. 24U, 9 meters each, to your email. The information will contain not only wholesale and retail costs, but also delivery times and possible delivery conditions if the region is not Krasnodar. As you can see, everything is quite simple and such a system is somewhat reminiscent of a virtual tender, which you can announce without filling out a whole stack of papers.
Now, of course, you want to know which link you can use to submit your application. You will find her address below:
Send a request to suppliers
You understand that from now on you have a unique opportunity through which you can save your time. Forget about unnecessary searches. After all, now all suppliers themselves will offer you their goods. And you decide who to give preference to.
By the way, the site is also good because information about the cost of rolled metal is updated daily and you can verify the obligations of the supplier if he is an authorized user.
This will help you avoid possible mistakes and save you from scammers.
Profitable deals are a reality, which tomorrow can become a great chance for you to buy everything you need of excellent quality at the lowest price.
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Happy shopping and transactions on the portal!
Source: http://krasnodar.metal100.ru/prodazha/Sortovoj-prokat/SHveller/24%D0%A3/9_p1
Channel - use and load
A channel is one of the types of shaped steel products. In cross section it has the shape of the letter “P”. This form provides the channel with such rigidity indicators that make it possible to use it in a wide variety of industries - from heavy engineering to the construction of country houses. Channels are used in automobile and carriage building, they are used to make various supports and fences, and they are used to strengthen entrance gates and window openings.
Numbers, letters and GOSTs
According to the production method, the channel can be bent or hot-rolled. It is easy to distinguish them even for a non-specialist - a hot-rolled channel has a clearly defined edge, while a bent channel it will be somewhat rounded. Other features of various types of channel are determined by their markings.
In particular, the letters A, B and C in relation to batches of hot-rolled channels will indicate that the rolling was carried out with high (A), increased (B) or normal accuracy (C).
The channel number indicates the height of its section, expressed in centimeters.
The width of the profile corresponds to the width of the shelf and can range from 32 to 115 mm. The marking of a channel, for example 10P, reflects its height and type of profile. The height of the channel section is generally the main parameter in its marking. The channel number is its height in centimeters, and the letters adjacent to it indicate that the channel cross-section can be:
1) with a slope of edges (series U and C), where U is the slope, and C or Sb are special series. 2) with parallel edges (P, E and L series), where E means economical series, and L means light. Letters C (for example - 18С, 20С, etc.
), can be found in products intended for the automotive industry or for the construction of railway cars (GOST 5267.1-90). Sometimes there are also exotic types of channels.
For example, GOST 21026-75 determines the parameters of channels with a bent flange (they are used in the production of trolleys for mines and mines).
The most popular channel sizes
The most popular among consumers are channels with numbers from 8 to 20. Their geometric parameters in categories P (that is, with parallel edges) and series Y (with a slope of internal edges) are the same, the difference is observed only in the radii of curvature and the angles of inclination of the shelves.
Channel 8 is used mainly for strengthening structures inside domestic and industrial buildings. In its production, semi-quiet (3PS) and mild (3SP) carbon steels are used, which are characterized by excellent weldability.
Channel 10 is widely used in mechanical engineering, machine tool building and other areas of industry. It is also successfully used in the construction of bridges, walls and load-bearing supports in the construction of industrial buildings.
Channel 12 is very similar to the “eight” channel, but has higher strength characteristics and load-bearing capacity, which makes it possible to reduce the metal consumption of structures erected with its participation.
Channel 14 is one of the most popular types of channels. used in building structures for rigid reinforcement of load-bearing parts, giving metal structures special strength and rigidity. Channel 14 comes in standard and increased accuracy.
Channel 20 acts as a load-bearing element when reinforcing bridges, when reinforcing floors (including complex ones) of multi-storey buildings, and in roof purlins.
Due to its high performance qualities, the “twenty” is often used in structures with high loads - both dynamic and static.
There are also non-standard applications of channels. A perforated (that is, “holey”) channel allows, for example, the installation of metal structures without welding, which significantly reduces installation time.
For perforation, channels with high shelf heights and wide distances between them are best suited.
Such products are designated by the letters ШП - “Perforated Channel” and are most often used in the construction of temporary structures (for example, scaffolding) or warehouse racks.
To create such structures, channels with small numbers are better suited, since the weight of the rack (and therefore the channel from which it is assembled) should not be too large.
In interior decoration, channels are used as a “security” frame when laying high-voltage electrical wires.
Sometimes channels are also used as a guiding load-lifting device, including as ramps for strollers and carts.
In general, the use of channels can be varied, but still their main purpose is to strengthen structures and the ability to withstand long-term loads.
How much can a channel weigh?
| Channel number | Weight of 1 meter in kg | Meters per ton |
| 5 | 4,84 | 206,6 |
| 6,5 | 5,9 | 169,5 |
| 8 | 7,05 | 141,8 |
| 10 | 8,59 | 116,4 |
| 12 | 10,4 | 96,2 |
| 14 | 12,3 | 81,3 |
| 16 | 14,2 | 70,4 |
| 18 | 16,3 | 61,3 |
| 20 | 18,4 | 54,3 |
| 22 | 21 | 47,6 |
| 24 | 24 | 41,7 |
| 30 | 31,8 | 31,4 |
Conventions in channel markings - how to understand them?
And since the main purpose of the channel is to withstand loads, from its markings it is first necessary to find out the parameters that will allow this load to be calculated, namely, the composition of the steel, its strength, rolling quality, and so on.
What can you learn from the labeling?
For example, before us is a package of hot-rolled channels, on which it is written: 30P-V GOST 8240-97/St3sp4-1 GOST 535-88
This means that we have a 30P channel - that is, with parallel edges and a section height of 30 cm. The letter B indicates the usual rolling accuracy B, made of steel St3, fourth category, first group.
The same channel, but only made of steel 09G2S with increased rolling precision, will receive the designation 30P-B GOST 8240-97/345 GOST 19281-89 , in which 345 will mean the strength of steel corresponding to grade 09G2S.
But in the marking A 300x80x6 B GOST 8278-83/2-St3sp GOST 11474-76, the letter A will indicate high accuracy of profiling of a steel workpiece (strips) from the second category of steel St3sp, from which a bent equal-flange channel with dimensions 300x80x6 (where 300 mm is made) cross-sectional height of the product, 80 mm is the width of the shelves, and 6 mm is the thickness of the shelves and walls)
Types of loads and channels
View A. “Canopy over the entrance.” This type includes beams with rigid embeddings. The load is usually applied evenly. These could be canopies over entrances. Welding is used for their manufacture. They are made of two channels attached to the wall, and the space is filled with reinforced concrete.
View B. “Interfloor slabs” Rigidly fixed single-span beams, the load on which is distributed evenly. Usually these are floor beams between floors.
View C. “Hinged balcony support.” The beams have two supports with a cantilever, the load is distributed evenly between them, but they extend beyond the outer walls. This is necessary to create support for the balcony slabs.
View D. “Under two jumpers.” These are single-span hinged-supported beams on which two concentrated forces act. Usually these are lintels on which another pair of floor beams rests.
View E. “Under one jumper.” These are single-span hinged-supported beams where one force is concentrated. Usually these are lintels on which one beam of another floor rests.
After it has been clarified what type of channel this channel belongs to and where the main load will go, a calculation formula is selected.
An approximate method for calculating the load on a channel
To make the calculation you need to do the following:
-First, determine the total load that will act on the beam - and multiply it by the standard safety factor for loads.
-Multiply the result obtained by the pitch of the beams (in this case this applies to channels).
Next, you need to calculate the maximum bending moment.
All data for the channel is taken according to GOST.
The formula is as follows: the bending moment Mmax will be equal to the design load multiplied by the length of the channel squared. The unit of measurement is kiloNewtons per meter. (1 kNm = 102 kgcm)
Then proceed to calculate the required moment of resistance of the beam.
The formula is as follows: the moment of resistance Wtr will be equal to Mmax, which is multiplied by the operating conditions coefficients and divided by 1.12 (this is a coefficient for taking into account plastic deformations).
Thus we obtain the required section. But at the same time, you need to remember that the channel number must be greater than the required section moment.
Source: https://stvybor.ru/staty/183-shveller-ispolzovanie-i-nagruzka/
What is the weight of channel 24?
The channel belongs to long products, its dimensions and properties are regulated by GOST No. 8240-97 (hot rolling channel) and 8278-83 (bent steel channel). Such products are used in heavy industry, shipbuilding, automobile and carriage building, construction of residential buildings, buildings and in many other areas.
Below we will look at the types of channel No. 24, the pros and cons of each series, as well as the features of connecting the channels to each other.
Channel (U)
For channels, carbon and low-alloy steels of various types are used as raw materials. Modern industry is mastering the production of channels from non-ferrous metals, but so far their share is insignificant, since in most cases, when channels are used in metal structures, the emphasis is on strength and the ability to withstand heavy loads , which steel channel beams successfully cope with.
Channel brandWeight of 1 meter, kg| 24 (U) | 24,00 |
Channel (P)
At the manufacturing plant, a special department (QC) controls the quality of the rolled products produced. Depending on the manufacturing accuracy, all channels are divided into three large groups according to this parameter:
- series A (high precision),
- series B (high accuracy),
- series B (regular accuracy).
| 24 (P) | 24,00 |
Channel (C)
For special series C channels, the letters A and B do not indicate the accuracy category, but the strength of the product:
- A - high strength,
- B - normal strength.
Such channels are used for the automotive and railcar industries. There are separate GOSTs for these industries, these are GOST 19425-74 and GOST 5267.1-90, respectively.
BrandWeight of 1 meter, kg| 24 (C) | 44,46 |
Channel (L)
Lightweight series channels take the best from strong steel channels and the lightness inherent in aluminum beams. According to GOST, such channels are almost two times lighter than conventional 24P channels, while being cheaper and can be successfully used in complex structures with high loads. Part-time work is not a tricky business.
BrandWeight of 1 meter, kg| 24 (L) | 13,66 |
Channel(E)
An intermediate version of channels with its own characteristics. Such channels are cheaper, weigh a little lighter and have different sizes and radii of curvature of the shelves to the channel wall . They are used where channel 24P or 24U is not suitable, and 24L is not suitable for the design load.
BrandWeight of 1 meter, kg| 24 (E) | 23,69 |
Channel connections
It is necessary to connect channels when it is impossible to do without it. Otherwise, it is better to avoid such knots in the structure, because when welding channels, the metal at the welding points will weaken, and the loads acting on the channels in different planes and torsion do not impart strength to the connection.
The simplest but most reliable way to weld two channels is butt-to-butt welding. The advantage here is the speed of work, but the quality suffers.
To obtain high connection quality and reliability, it is necessary to adhere to GOST recommendations when welding, starting welding with the thickest-walled channel elements, then moving on to thin-walled ones. It will be important to weld a continuous seam without gaps, because Moisture may accumulate in the gaps and the channel will begin to rust, which will lead to the gradual destruction of the structural unit.
Source: http://stroymetcon.ru/sortament/profilnaya/shvellery/ves/kakov-ves-shvellera-24.html
