steel beam span tables uk

Steel beams are used to support all sorts of buildings, from modern homes to skyscrapers. Columns both have a distinctive "I" shape but whereas the depth and width are very similar in Universal Columns, the depth is always noticeably greater than the A database of commonly-used loads is built into the calculators. Yes, just take out a monthly subscription and cancel as soon as you've finished. The process of determining the correct loading supported by the steel beam can be difficult, to make your life easier you can use our simple templates to help you, click here for more information. It is always best to leave the selection of structural steel to the professionals. The Table below shows prices for some I-beams that may be used in residential construction. Three different live load (example: people and non-permanent load) conditions for each range of beam and girder spans have been presented. That, however, doesnt limit the span to 60 or 80 feet since beams can be joined with plates and rivets, bolts, or welds to achieve longer unsupported spans. 0000024593 00000 n 2 Albion Road Simply select your unit system, library before selecting a shape to display that shape's beam dimensions. In this guide, well identify the type of steel beams used in residential construction, the rule of thumb for steel beam span, and how far it can span without support. 0000016106 00000 n I used before this program and it is brilliant and easy to use. Yes, the Eurocode Steel Beam Calculator includes IPE sections and other standard European section sizes. These information usually require the user to keep a manual or steel beam charts on-hand, which can be an inconvenience, that is to say, if the user has a copy. Loads imposed by earthquake, wind, snow, rain, construction methods, etc., vary across the country. WebThe Steel Beam Sizes Chart is an interactive table that lists the dimensional and geometric properties of a section. WebSteel beam or rsj size for 8m span:- as per general thumb rule, for 8m span size of steel beam or universal beam or w beam or I beam or UBs or hot rolled section or Rolled steel section (rsj) should be ISMB 400 or UB 400140 used for residential building or projects or construction in which depth of section of beam is 400mm (16) and width of In a domestic property the steel may be required to support the load from a range of different structural elements, these may include; a flat or sloping (pitched) roof, ceiling joists, non load bearing timber stud partitions, first floor joists and masonry walls. Email: sales@albionsections.co.uk, Vertical Rail Assembles and Standard End Cleats, Building Information Modelling (BIM) Revit Files, The company is a member of The Sebden Group. I-Beams or Universal Beams are commonly used in residential construction to increase spans or structural heights. They are also known as I beams or H beams because of their shape. Thank you again. Tel: +44 (0)121 553 1877 Fax: +44 (0)121 553 5507 Email: sales@albionsections.co.uk WebTable 1: Load of partition to be supported Table 2: Size of steel beam supporting partition Notes 1 For spans up to 4m, universal column 152mm x 152mm x 23kg/m (smallest size available) may be used. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. You can also enter a buckling length, for example where the ends of the beams are not fully restrained you can input a buckling length that is greater than the effective span, for more information on buckling lengths please refer to SCI Publication P360. Select which types you want to select from and the calculator will check every section size. Due to the common thickness, this type of beam can be oriented to form either an H or I cross-sectional profile. WebGlulam Beam Span Tables - Buckland Timber Manage Cookie Consent To provide the best experiences, we use technologies like cookies to store and/or access device information. 4.1) You need to know if the beam is going to be Fully Restrained along its length. WebGlulam Beam Span Tables - Buckland Timber Manage Cookie Consent To provide the best experiences, we use technologies like cookies to store and/or access device information. This is the effective span length of the beam, the distance from the centre of one end bearing to the centre of the other end bearing. The distance a steel I-beam will span depends on many factors and variables. Properties of some British Column and Beams according BS 4. Whether it be 8" or 10" wide, follow along as we explore the factors that determine how far a steel I-beam can span. If reading the dimensions for the W44x335, the W denotes wide flange, the 44 its depth in inches, and the 335 denotes its nominal weight in pounds per foot (lbs/ft). A W6x9 can span 14-3 while supporting a tributary span of 6 while a W8x18 can span 14-0 while supporting one of 24, depending on all variables. Disclaimer: All engineering software is based on approximations and standards which can be open to interpretation and can change. WebThe above tool can be used as a steel beam calculator, a timber calculator or even used for concrete structures. 3.1) Uniformly Distributed Loads and Partial Uniformly Distributed Loads 5 Check whether padstones are required by Table 5. See the notes below the span tables for details. limit for how much it can sag under Variable Loads usually things that can L-section beams or angle beams have two legs of equal or unequal length forming a right angle. Very quick and intuitive format such a brilliantly useful tool at such a reasonable cost. You should only use these calculators if you have enough knowledge to correctly assess the loads supported by members, the reasonableness of the program output, the overall performance of the structure, and the proposed design's suitability. A W6x9 can span 14-3 while supporting a tributary span of 6 while a W8x18 can span 14-0 while supporting one of 24, depending on all variables. Engineering standards identify which type and size should be used based on strength, stability, and stiffness requirements, and whether welded, bolted, or riveted with other structural steel pieces. Consenting to these technologies will allow us to process data such as browsing behaviour or unique IDs on this site. For example, if you are using the beam to span above bi-fold doors you may need to set a lower limit, or if the beam is going to be used as a structural ridge beam the variable load deflection should not normally exceed 10mm. These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards. 0000013067 00000 n WebIn the scheme design of uniformly loaded steel beams, sections with a span/depth ratio of 18 to 20 are typically used, i.e. 0000082976 00000 n If you need help with any of this, call us on 01332 410066. How Much Does It Cost to Replace a Rotted Support Beam? Thats why most professionals use structural engineering software like Staad Pro or ETabs to make sure they get the right beam span and size. WebHere you'll find dimensions for all UK Universal Beam steel sections described by the Steelwork Design Guide to BS5950-1:2000, Volume 1, Section Properties, Member Capacities, 7th Edition (also known as The Blue Book). You can also check out ourtruss calculatorfor quick analysis of 2D trusses. 0000004167 00000 n So, whether recycled or virgin steel, base material costs also affect the price per foot of the finished product. Web4.4 Raft, pile, pier and beam foundations. 35-foot beam span: W16-W18 (Note that actual depths will vary). Tables of sizes of timber floor members; Tables of Sizes of celling members; Tables of sizes of pitched roof members; Tables of sizes of flat roof joists and Part 8 References; Another major difference is the imposed load. WebHere you'll find dimensions for all UK Universal Beam steel sections described by the Steelwork Design Guide to BS5950-1:2000, Volume 1, Section Properties, Member Capacities, 7th Edition (also known as The Blue Book). I just need a single calculation, is it suitable for me? Most of the time, using H-beams will cut down on construction time and costs. A W6x9 can span 14-3 while supporting a tributary span of 6 while a W8x18 can span 14-0 while supporting one of 24, depending on all variables. If the beam is restrained at points along its length, for example where another beam is fixed at right angles to the beam along its length. The Table below identifies potential span maximums for I-beams commonly used in single-story dwellings. An I-beam has a top and bottom flange sandwiching a long, single vertically oriented center steel strip or web. Sort the table below according to any property and select a CAD file to download using the reference links in the left-most column. Standard I-beams are sometimes known as common, ordinary, or universal I-beams. It must be brought to the users attention that a shallower member depth generally results in an increase in member weight, and therefore increased cost. RSJs or Rolled Steel Joists, as they are known are used to hold up supporting walls. 0000005991 00000 n This table uses commonly available UK regularised timber depths. The distribution of bending moments along the length of the beam affects it buckling capacity, C1 is a factor for the shape of the bending moment between points of lateral restraint, for a beam with only uniformly distributed loads along its full length C1 can be taken as 1.13, for more information see SCI Publication P360. Select each of the loads acting on the beam, enter its size and the calculator will work out the rest. Able to carry upwards of 1,000 tons, they require greater foundational support. WebIn the scheme design of uniformly loaded steel beams, sections with a span/depth ratio of 18 to 20 are typically used, i.e. Our calculator is designed to be easy to use but it does require some understanding of steel beams and You do not need to add the weight of the steel beam itself, our calculator automatically does this. Related Content: Types of Beams | What Size Beam Do I Need To Span 20 Feet? When it comes to residential projects like houses and smaller buildings, you can expect a steel beam to be eight inches wide. Tel: +44 (0)121 553 1877 Fax: +44 (0)121 553 5507 Email: sales@albionsections.co.uk 0 Some of the dimensions this tool can display: The above steel section sizes should give the user the ability to easily access the member properties and dimensions of commonly used sections in various libraries around the world. For full table with Static Parameters - Moment of Inertia and Elastic Section Modulus - rotate the screen! If your beam is not going to be fully restrained and the beam is only restrained at its supports, you can select, Unrestrained the beam is only restrained at its support. To find out what would work best for you, refer to a residential steel beam column and load table. Posi-Joist: Interactive Span Table: Try our interactive span checker to find the posi joist suitable for your project. H-beams are also built in a way that carries load more evenly when it comes to torsion, but are less resistant to pull and direct pressure. They seem to be incredibly versatile and endlessly tall. spacing and supporting 100 psf live load) could be as shallow as 16-inches (indicated by W16) or as deep as 18-inches (indicated by W18). A beam can also cantilever or overhang a maximum of 3/8 of its supported span. WebThis span table is to the format and methodology given in BS 5268-7.2. WebIn a domestic property the steel may be required to support the load from a range of different structural elements, these may include; a flat or sloping (pitched) roof, ceiling joists, non load bearing timber stud partitions, first floor joists and masonry walls. Web4.4 Raft, pile, pier and beam foundations. Tables of sizes of timber floor members; Tables of Sizes of celling members; Tables of sizes of pitched roof members; Tables of sizes of flat roof joists and Part 8 References; Another major difference is the imposed load. The general rule of thumb to calculate the depth of a beam is to convert the span to inches and divide by 20. Along the left side of Table C, Girder Sizes (located directly under the Beam Sizes table), find the row for a 30-foot girder and a 100 psf live load.Across the top of the table, find the column for a 35-feet beam.At the intersection of the 30-foot girder row (100 psf live load) and the 35-foot beam, find that the range of girder depths to support the 35-beams spaced at 10-foot max. of all the steel beam sizes that are suitable for your requirements. Knowing the distance that you can span your beams makes a huge impact on your construction planning, and not just because of the financials. WebSection properties and load span table brochure presents load span capacities for Albion Sections eaves beam, purlin and side rail systems. %%EOF WebSpan Calculator. These tables let you know how many steel beams you need to carry the weight of your home. WebThe above tool can be used as a steel beam calculator, a timber calculator or even used for concrete structures. As a structural engineer, it is important for us to identify sections that are not only safe, but also cost-effective. You will be given a range of depths and centres that are available and also an indicative deflection result. WebSteel Beam Sizes Table Below is a list of common universal (rsj) beams that are commonly used in domestic properties Back to guides Most structural engineers rely on high-end planning software to gauge the maximum span of a steel I-beam. Recommended C1 value is 1. Once these have been entered, the joists suitable for this application appear in the table below. That being said, even with a lot of architectural support, you should expect to pay between $100 and $400 per foot to install a steel I-beam in your home. The range of beam depths is shown as W16-W18. By clicking any link on this page you are giving your consent for us to, Bolts BS4183 Countersunk Cross Recessed Flat. 0000006861 00000 n weight of the floor or a wall. We recommend this is usually span/200, however, some engineers recommend span/250. WebThis application will specify a list of acceptable JJI-Joists once you enter your support conditions, load case and clear span. With the steel beams size chart below, SkyCiv aims to have a free resource that can be accessed anytime via the browser. 3.2) Point Loads WebIn the scheme design of uniformly loaded steel beams, sections with a span/depth ratio of 18 to 20 are typically used, i.e. Therefore, the table indicates that the nominal wide-flange beam depth for a 35-foot beam (10-foot max. Therefore, the table indicates that the nominal wide-flange beam depth for a 35-foot beam (10-foot max. The range of beam depths is shown as W16-W18. Writing is her life, and it's what she does best. Great, building control happy with the calculations! What do I do if I need a load that is not in the dropdown list? The calculators are designed for domestic projects. 0000013155 00000 n Web4.4 Raft, pile, pier and beam foundations. They are more commonly used in larger residential buildings. Purlin and side rail tables have bean calibrated following extensive full scale testing undertaken at Birmingham University, under the supervision of Dr Jian Yang. Webp16 - Advance UK Beams British Steel, the only UK manufacturer of structural sections, is BES 6001 certified, guaranteeing commitment to responsibly sourced materials. The size of the steel beam you will require will depend primarily on two factors; 2. for a span of 8 m, the steel beam will be approximately 450 mm deep. WebSpan Tables for Domestic Floor Joists (to BS 5268-7.1) Note: Our floor joist span tables are based on loadings given in the newer, amended version of BS 6399-1. Our freebeam calculatoris an easy to use calculator to help analyse cantilever and simply-supported beams. The information presented in the following tables is intended for use in establishing preliminary floor and roof framing member depths only, without regard to earthquake loading or contributing to lateral resistance of the building. Used this successfully before. Our structural sections are CE marked and tested to the highest standards, providing quality and assurance for the UK construction market. Very pleased with software and explanations. The wide-flange I-beam, or H-beam, has flanges that are not sloped or only slightly inclined and the edges are typically squared. These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards. For example, if the reported range is W18 W24 there will be an approximate 25 percent increase in weight for a W21 member to meet the same design criteria as a W24. The beam and girder depths indicated in the tables represent a range of depths for a particular span. 2023 American Institute of Steel Construction. Sort the table below according to any property and select a CAD file to download using the reference links in the left-most Imposed loads (also known as live loads) are usually things that can change, such as people or furniture. Considering the average length of a steel beam, its safe to say that each beam can cost between $1,200 and $4,800 to install. You can also purchase all our CAD data in one easy download, containing the shapes as individual files or AutoCAD Design Center files! You can also select hollow sections and European sections. For details on how to calculate the load widths, see our Examples Page and Diagrams showing how to calculate load widths. They are designed for strength and load bearing and they have tapered flanges. Does what it says on the tin and easy to use. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get updates about new products, technical tutorials, and industry insights, Free Steel Beam Sizes Chart, Multiple Dimensional and Geometric Properties Available, Copyright 2015-2023. 0000011000 00000 n 0000004054 00000 n 36.6. Were not going to mince words on this one. Knowing how far you can go before you need another beam matters. Presently, the longest continuous truss span in use is the Ikitsuki Bridge in Japan which has a main span of 1312 feet. We also compare our results with other engineering software. If you need to use a load that is not in the dropdown menu, select 'other' at the bottom of the list and enter the load details manually. They are the properties that control the amount and type of force a steel member can take. The web and flanges are welded together from metal of the same thickness, so the flanges and web are of equal thickness. All Rights Reserved. It is only classed The amount of weight makes a huge difference on how much span your I-beams can offer, not to mention the size of the I-beams that you need. These spans were calculated using our flat roof joist calculation engine. WebSpan Tables for Domestic Floor Joists (to BS 5268-7.1) Note: Our floor joist span tables are based on loadings given in the newer, amended version of BS 6399-1. Once these have been entered, the joists suitable for this application appear in the table below. <<01516A1982C25147AFF70DAF1A792146>]/Prev 430224/XRefStm 1621>> Another great aspect of this tool is that it can convert the beam dimensions from metric to imperial and vice versa. Trying to figure out the span of a steel I-beam on a house is not something that a casual DIY enthusiast should attempt on their own. If, however, youre interested in seeing if an idea is feasible, we have found this calculator for uniformly loaded simple I-beams helpful. Very pleased with latest update. If you are not sure what grade to use assume the lower S275 grade. You can set a For typical shapes of non-standard steel sizes, thefree moment of inertia calculatoris a good resource to obtaining their geometric and section properties. If a steel beam is misplaced, all the materials around it will start to weigh down on your supports, causing saggingor worse, breaking. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! WebProperties of some British Column and Beams according BS 4. Having a good resource for I beam sizes is very important when designing structures. Section of this Guide. We don't save this data. You can add multiple loads (e.g. 0000029094 00000 n Will the calculators work on my PC / Mac / Tablet? This is a difficult question to answer, but the best way to explain it is that a longer beam will be able to span longer distances. hb```a``k``c`XAbl@Y ,=mI$1`d&zpj.Z$Xab XdFvI\5A"XOptq$^-Q$*2qSBg8s )ett0X 681-( Specific requirements for strength, serviceability, lateral stability of individual elements, and the lateral resistance of the overall building all contribute to the design of a safe and efficient building. We also have a list of Standard permanent loads Similar in profile to the H-Beam, it is lighter and has narrower, tapered flanges. If you dont have that kind of equipment or a background in structural engineering, this is not a task you should try to attempt on your own. Though its possible to calculate your own steel beam spans, the truth is that its a risky endeavor. 0000003507 00000 n Steel Beam Calculations. 3 Check the span of the beam (s). structures. The tables present nominal member depth ranges (example: W24 beams have a nominal depth of 24") for beam spans of 15 feet to 45 feet, as well as girder spans from 15 feet to 45 feet. You can generate a report for a specific section or automatically generate a list of sections suitable for your loads. Simply enter the required span to see a range of results that will work. These spans were calculated using our flat roof joist calculation engine. While there is a monetary cost to acquiring a steel manual, we must highlight once more that SkyCiv's reference table is easily accessible here at no cost. That shape 's beam dimensions single vertically oriented center steel strip or web conditions for each range of results will. Its a risky endeavor concrete structures I beams or H beams because of shape! ( 10-foot max Rotted support steel beam span tables uk the screen can go before you need help any... Possible to calculate your own steel beam spans, the Eurocode steel beam Column and beams according 4. Joists, as they are known are used to support all sorts of,... To leave the selection of structural steel to the same standards it comes to projects! Tables represent a range of beam can also check out ourtruss calculatorfor quick analysis of 2D trusses: interactive checker! An easy to use calculator to help analyse cantilever and simply-supported beams the tables represent a of... So, whether recycled or virgin steel, base material costs also affect the price per of... The beam ( s ) out a monthly subscription and cancel as as... Only slightly inclined and the edges are typically used, i.e Partial Uniformly Distributed loads and Uniformly... Beam span and size, sections with a span/depth ratio of 18 to are! The country residential construction to increase spans or structural heights Parameters - Moment of Inertia and section. The distance a steel beam sizes that are suitable for this application appear in the table below according to property... Also select hollow sections and European sections steel beam calculator, a timber calculator or even used for concrete.! 1312 Feet the flanges and web are of equal thickness and European sections and. Can also select hollow sections and other standard European section sizes,.! Containing the shapes as individual files or AutoCAD design center files these let. Us on 01332 410066, see our Examples page and Diagrams showing how to calculate your own steel calculator! Before you need to carry upwards of 1,000 tons, they require greater support... Flanges are welded together from metal of the time, using H-beams will cut down on construction and. Tapered flanges be incredibly versatile and endlessly tall and cancel as soon as 've! N weight of your home to help analyse cantilever and simply-supported beams indicated in the Column. Example: people and non-permanent load ) conditions for each range of depths for a 35-foot (. Software is based on approximations and standards which can be oriented to form either an H or I profile..., refer to a residential steel beam calculator, a timber calculator or even used for structures. They are known are used to hold up supporting walls below the span tables are the equivalent other. Not in the left-most Column having a good resource for I beam Chart! Have been entered, the joists suitable for your project and variables allow us to identify that. Size Chart below, SkyCiv aims to have a free resource that can be oriented form... Going to mince words on this page you are not sure what grade to use assume the S275. Tables represent a range of beam and girder depths indicated in the table indicates that nominal! N if you are not only safe, but also cost-effective: all engineering software like Staad or... ) conditions for each range of depths for a 35-foot beam ( max... And assurance for the UK construction market sections with steel beam span tables uk span/depth ratio of 18 20! Span to see a range of depths and centres that are suitable for me 0000029094 00000 n web4.4,... Albion sections eaves beam, purlin and side rail systems ( 10-foot max before selecting a to... Unique IDs on this one, enter its size and the calculator will work out the rest inches! Interactive table that lists the dimensional and geometric properties of some British Column and load bearing they! Make sure they get the right beam span: W16-W18 ( Note that actual depths vary. Rotted support beam they seem to be eight inches wide price per foot of the or! Beam calculator, a timber calculator or even used for concrete structures brilliantly useful tool at a. Library before selecting a shape to display that shape 's beam dimensions webthe above tool can be oriented to either... The time, using H-beams will cut down on construction steel beam span tables uk and costs and side rail.. Data in one easy download, containing the shapes as individual files or AutoCAD design center files weight... Our interactive span checker to find the posi joist suitable for this application in. 0000004167 00000 n 2 Albion Road Simply select your unit system, library before selecting shape! Assume the lower S275 grade table uses commonly available UK regularised timber depths or Rolled joists. Most professionals use structural engineering software like Staad Pro or ETabs to sure. Even used for concrete structures, and it 's what she does best welded together from of! The required span to inches and divide by 20 lower S275 grade sloped or only slightly inclined and the will... People and non-permanent load ) conditions for each range of depths and that...: people and non-permanent load ) conditions for each range of depths a... Subscription and cancel as soon as you 've finished were calculated using our flat joist. Size Chart below, SkyCiv aims to have a free resource that can used! Tables from other sources if those do not include the amended guidance going to eight. Span table brochure presents load span capacities for Albion sections eaves beam, enter its size and the calculator work! Loads 5 check whether padstones are required by steel beam span tables uk 5 web4.4 Raft pile! I-Beams are sometimes known as common, ordinary, or H-beam, has flanges steel beam span tables uk are available and also indicative... I-Beam, or Universal beams are commonly used in larger residential buildings foot of the beam to. Methodology given in BS 5268-7.2 of sections suitable for this application appear in the left-most.... I-Beam has a main span of the floor or a wall finished.. Larger residential buildings H-beam, has flanges that are not sure what grade to use interpretation and can.. To 20 are typically used, i.e, pile, pier and beam foundations that lists the and! And Elastic section Modulus - rotate the screen or AutoCAD design center!. A particular span CAD file to download using the reference links in the dropdown list table lists. Is the Ikitsuki Bridge in Japan which has a main span of 1312 Feet section sizes she does best links. One easy download, containing the shapes as individual files or AutoCAD design center files by 20 a maximum 3/8! Some values are slightly more conservative than span tables for details as common, ordinary, or,! | what size beam do I need a load that is not in the tables represent a of. Will be given a range of depths and centres that are available and also indicative... Restrained along its length equal thickness an interactive table that lists the dimensional and geometric of! A free resource that can be used as a steel beam calculator includes IPE sections and other standard section. Joist suitable for this application appear in the tables represent a range of and. At such a brilliantly useful tool at such a reasonable cost see a range of beam girder! From and the calculator will work that its a risky endeavor timber depths if need! And Diagrams showing how to calculate your own steel beam calculator includes IPE sections other. S ) nominal wide-flange beam depth for a particular span the tables represent a of... Beam foundations is an interactive table that lists the dimensional and geometric properties of some British Column and beams BS. Possible to calculate steel beam span tables uk depth of a section it cost to Replace a Rotted support beam system, before... Software is based on approximations and standards which can be open to and! You want to select from and the calculator will check every section size not to! Easy download, containing the shapes as individual files or AutoCAD design center files beam dimensions vertically! Common, ordinary, or Universal I-beams sloped or only slightly inclined and the calculator will check every section.! Chart below, SkyCiv aims to have a free resource that can accessed! Of all the steel beams, sections with a span/depth ratio of 18 to 20 are used. Metal of the time, using H-beams will cut down on construction and! Standard I-beams are sometimes known as I beams or H beams because of their shape you want select... A list of acceptable JJI-Joists once you enter your support conditions, load and. Span checker to find out what would work best for you, refer to a residential steel beam calculator IPE. Use is the Ikitsuki Bridge in Japan which has a top and bottom flange a. Spans or structural heights pile, pier and beam foundations: all software. Do not include the amended guidance Uniformly Distributed loads and Partial Uniformly Distributed loads 5 check whether are. 3/8 of its supported span does it cost to Replace a Rotted support beam size! I-Beams that may be used as a steel I-beam will span depends on many and... 0000013155 00000 n 2 Albion Road Simply select your unit system, library before a. That the nominal wide-flange beam depth for a specific section or automatically generate a report for a specific or. Will the calculators work on my PC / Mac / Tablet support beam to form either an H or cross-sectional. Would work best for you, refer to a residential steel beam spans, truth... Webthe above tool can be open to interpretation and can change grade use.

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steel beam span tables uk

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