triple 2x10 beam load capacity

However, if you are building a header to support a door or window, then you are constrained to the width of your framing lumber. Before finalizing structural plans or beginning to build, it is best to check with your local Building Department or a Structural Engineer. GIRDER SPANS AND HEADER SPANS FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, southern pine and spruce-pine-fir and required number of jack studs) That lumber is going to have to be spliced together someplace. But it cant account for things like the type of footings you have, post size, or snow load. I see that 54 people read your post and no one answered. csg-tjcan22 - Simpson Connector Guide for Trus Joist Products (Canada); tj-9510 - Installation Guide for Floor and Roof Framing with TJI s31, s33 and s47 Joists - East Canada; tj-9001 - Installation Guide for Floor and Roof Framing with TJI 110, 210, 230, 360 and 560 Joists; tj-9001p - Installation Guide for TJI 110, 210, 230, 360 and 560 Joists (in Punjabi . In the construction industry, span is the term used to identify the unsupported distance a structural member or component traverses or bridges between supports. This table is for a live load of 40 psf and a dead load of 10 psf. Second, each species of lumber is graded. A 210 rafter that is spaced at 12 intervals can span up to 26 2. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Then a little algebra to solve for the maximum uniformly distributed load such a beam can carry: S = M/Fb, so M = S*Fb. Using the attic space for limited storage reduces the spans, so check the local codes for distances. Why did the Soviets not shoot down US spy satellites during the Cold War? Of course, in the case of a full basement, where the perimeter beams are sitting directly on the concrete basement walls, support and span are not an issue, as the beams have continuous support. For the loads identified, a DF-L SS can span 19-1 with a spacing of 12 between joists, 17-4 with 16, and 15-2 with 24 spacing. A single #2-SP 210 beam can span between 4-0 and 7-0 if the joist span is 18 and 6 respectively. What size beam do I need to span 15 feet? 2, all other lumber graded as No. What city and state do you live in for possible snow load consideration? It should be noted that beam span is dependent on the effective joist span length, which ranges from 6 to 18 feet in the IRC. beam self weight 225 lbs per yard. Engineered Floor Joists vs 2X10 Lumber: Which is Better? The beams will be 3-ply PT SP#2 2x12's using 12' long lumber cut to fit the distances between the supporting posts. The room is 15' x 19' and has a triple 2x10 beam running the full length of the room (19' span) and currently has a screw jack supporting the beam in the middle. The further it is shipped, the greater the costs. Show More. Consequently, bolts at the ends of the beam must transfer the end . Join in and write your own page! Most lumber yards, however, carry a variety of construction lumber and can order in different species, usually at premium prices. 2X10 much a how can hold 488 plf ceiling joists where the . The IRC and the American and Canadian Wood Councils test and publish tables and information on maximum structural loads, spans, and standards for different species and grades of wood materials and products. They cut the main beam's span in half. It is often impossible to buy this lumber long enough to make a three-ply beam out of only three pieces of lumber. To install a Laminated veneer lumber beam for residential construction costs $50 to $200 per foot or the total cost of installation would be around $800 and $2,500. . There will be no joist hangers on the sides. Switching to Western cedars or Redwood and the span ranges from 6-11 to 12-0, again, depending on joist span lengths. I agree with your innermost ply. A 210 beam made up of two 2x10s nailed together can span up to 11 without support beneath a deck that is 4 wide. (feet) Weight Supported (lb) 2 x 2" x 6". However, this is for 12 o.c. Conclusion:- There are no instances when you would use a single 210 as a support beam as a single cannot bear the load required for a structure such as a deck or a home. What are some tools or methods I can purchase to trace a water leak? Be sure to double nail at both ends of every board, so that there are nails in the top and bottom edges of the board. As the load increases, however, the spans decrease. Beam span depends on the species and grade, as well as the effective joist span. Connect and share knowledge within a single location that is structured and easy to search. How to calculate support reactions in a beam; Sample calculation of how to find support reactions; and. This is unrealistic because any living space or deck requires a joist that can support a 40 psf live load. Typically, 210 joists at 16 centers can cantilever a maximum of 1/4 of their back span. Rafters without an attached ceiling can span further than those with it attached. It dries quickly, absorbs chemical treatment and paint easily, and is used in all aspects of construction. As per general rules and guidelines, #2 grade southern pine of a triple 26 deck beam can span upto 8 feet, (3) 210 can span 13 feet, (3) 28 can span 11 feet and (3) 212 can span 15 feet. Our VERSA-LAM LVL is manufactured in either Alexandria (Lena), Louisiana in Eastern United States, or in White City, Oregon for the Western United States. How do I install a non-load bearing wall on a carpeted concrete floor and finished drywall ceiling? The Code requires a Live Load of 40 lbs. The distance a 210 can cantilever depends on what and how it will be used, the spacing between joists, roof width, floor and roof live loads, ground snow loads, as well as grade, species, and other general factors. A floor or deck joist span depends on the spacing between joists and the loads anticipated, plus the wood grade and species. For the abovementioned calculations, we are using SYP or Douglas fir as the species. How far can a triple 212 beam span theplywood.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com, amazon.co.uk, amazon.ca. Covers any span and every load with pin point accuracy. The next question is how to build those beams. Suppose we have a 4.0-meter long simply-supported beam with an applied 10.0 kilonewtons (kN) point load 2.0 meters from support A and another applied 3.5 kN point load 1.5 meters from support B, as shown below: To calculate for RB\small R_\text{B}RB, we formulate the equation of moment equilibrium as follows: By performing a summation of forces, we obtain: Please note that for this summation, we have considered all downward forces as positive and all upward forces as negative. . Fir-Larch. In total, you can input up to 11 point loads in our beam load calculator. 2 Dense No. Doubling or sistering a 210 joist is usually done to strengthen or repair an existing plank of the same dimensions, not extend its length. A 3-ply with 2 X 10s would mean that three 2 X 10s are . This second table if for live load of 30# and dead load of 10#, as would be needed for the second floor of a home, where the home design calls for the sleeping areas to be on the second floor. Having SYP lumber available could mean the difference between using 2x10s versus a larger and more expensive dimension of lumber such as a doubled 212. You indicate the beams are 8' on center, so the total load on each beam is: 50 psf x 8' (4' on ea.side of beam) = 400 plf. By equating the moments due to load to the moments due to support reactions, we can then determine the reactions at the supports. However, a #2-SPF 210 will only span 3-6 to 6-8 at those joist spans. Thanks for contributing an answer to Home Improvement Stack Exchange! AITC SP-48 Roof Beams Construction Load. A 210 southern yellow pine joist can span 16 feet and 1 inch without support. choose the row for the size of lumber used in the double header: use 26 in this example. Durable LVL Lumber for Construction Projects Laminated veneer lumber (LVL) is a high-strength engineered wood product, and one of the most . One of DF-L, Hem-Fir, or SPF under similar conditions can span between 5-6 and 10-0. For each application, a PDF download is available. 2x10 3x10 4x10: Dense Select Structural Select Structural Non Dense Select Struc No. At CivilSir, we share all the information related to civil engineering. But, if that is not where the posts are located, I would shift one outer ply to the left and one to the right about 2' so the two joints on the outside plies are also staggered. Joist hangers are designed to provide support underneath the joist, rafter or beam to provide a strong a connection. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Depending on various factors, the maximum span for a 28 floor joist is 16' 6". The weight of those floor joists and the weight they carry is figured into the maximum span for the beams. Calculate the size needed for a beam, girder, or header made from No. But if you are in an environment where salt air or spray is an issue I would use stainless steel 304 screws. The type of joints is most important, each joint is a potentially weak spot.. A triple #2 210 beam of Southern pine can span between 7-6 and 13-0 with a live load of 40PSF depending on the joist span. However, there are some situations in home building where larger posts might be used. The support forces F3 and F4 can be calculated (500 kg) (9.81 m/s2) + (500 kg) (9.81 m/s2) = R1 + R2 => R1 + R2 = 9810 N = 9.8 kN Note! The OSB is priced a few dollars less than the plywood. On top of the posts is a 23' beam of unknown width and height. You say 6x6 posts 12 apart and then you say 10-6 from one another . The interior beam span is also affected by the number of floors and roof load unless it is a clear span using trusses. Grade 1 lumber have higher strength than other grade Lumber due to fewer knots. The post or column should rest on a foot-ing that meets local building code requirements. If you want to know how much your beam can hold but cant find out the information online, then you can calculate it based on the minimum load requirement required by the building code. I have two triple carrying beams on 6x6 post, 12'apart from each other let to right. Multiply to find the square footage, which is 64 square feet. This is where I have my open span. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Typically, beams are made of multiple 2x 10s or 2x 12s, while the floor joists are single layers of the same size boards. Finally, a calculator can tell you how big or small a joist or beam youll need. Since the load is applied to this composite beam through the wood side pieces, the bolts must distribute that portion of the load that the steel plates will be carrying. But the other two plies cannot be joined at the same place. Adding a second floor decreases the spans as it increases the loads. And an RSS screw is the finest.Q2: b) Use a zig-zag pattern and double up on screws at the ends of each board. The distance a 210 can span depends on many variables, including the depth of ones pocket. How? for the 9ft to 11 ft span I can use 20ft long 2x10's however to cover the 2 11ft sections I would need a 2x10x24 which I cannot get. Using DF-L, Hem-Fir, or SPF and the span changes to 7-2 and 126 under the same conditions. Angled joist hangers should be available at your local lumberyard for 2x6 and 2x10. Tables providing allowable floor loads (C D =1.0) and allowable roof loads (C D =1.15 and C D =1.25) for Southern Pine dimension lumber and Southern Pine glued laminated timber are detailed below. It is L shaped and will have 2 long beams (27.5' and 31'). The species of lumber available in your area commonly is what grows within inexpensive shipping distances. A beam supporting two stories instead of one typically has spans shortened by about 25%. Dec 8, 2012. Providing better information on softwood and hardwood. Snow load often is substituted for live loads, especially for outside decks and roofs. You may freely link to this site, and use it for non-commercial use subject to our terms of use. Whats the difference? S is lower for the 2x10's at 85.564 in^3 than for the 2x12's, so using that we get M = 136,902.4 in-lb = 11409 ft-lb. To be clear, spans are measured as "clear spans". Plus, if the spacing between is 12 the span is greater than if it is 24, so keeping all the factors straight is important. Headers have a few more factors affecting span than just species and grade of lumber, such as interior or exterior walls, snow load, number of floors, center bearing vs clear span, and building width. That will make the middle ply function essentially as if it is one continuous piece. Please note that in cases where the wood type is not known, it is best to assume the weakest possible lumber for that application and use the span shown for that type. The species, grade, and spacing commonly affect the length, with a double #2-210 DF-L at 12 centers spanning 18. This adds an additional layer of complication to the equation, giving us one more reason to work from a table, rather than calculating the ideal size to use. Mechanically fastened and glued built up plies have a tendency to conform to the place they are built on. Quite often, the distance a beam can span is also determined by the spacing of joists or rafters it will support, and vice versa. @Chenmunka He didn't specify American water. To gain extra strength, additional pieces of wood are laminated together, making a thicker beam. How can the mass of an unstable composite particle become complex? Simpson Strong-Tie offers a diverse line of hangers to handle almost any application with top flange, concealed flange and field-skewable and slopeable options. Triple 2 x 10 Beam Span March 24, 2022 by admin Wood-framed buildings use standard dimensional lumber as the load-carrying members, divided into two categories: posts, which are vertical elements holding up the weight of the structure and transferring that weight to the foundation and beams which support the weight between the posts. At first, you will only see fields for two loads (Load 1 and Load 2), but once you enter a value for \small x_2 x2, the fields for Load 3 will show up . Deflection allowed = span in inches / 360. The Fora platform includes forum software by XenForo. Check out 19 similar materials specifications calculators . 2000 . Having multiple joist sizes for the ground floor (for example) would make the design and building of the basement walls much more complicated, as it would be necessary to adjust the top of the walls to match the difference in joist height. For 20-foot spans, the wood beam has to be at least 18 inches in depth. How can I frame a four-sided cantilever on a 10x12 freestanding, floating deck? Which one would you recommend.What pattern would you recommend for the fasteners? Below, we express a summation, \small \sum, of the moments at support A to find the reaction at support B, denoted as RB\small R_\text{B}RB, as shown below: By rearranging the equation, we can isolate RBR_\text{B}RB as follows: Now that we have an expression to find RB\small R_\text{B}RB, and since we know that the total applied forces are equal to the reactions' total, we can now also find the reaction at support A, RA\small R_\text{A}RA, using the following equations: Now that we know how to calculate support reactions in beams, let us now consider an example calculation to strengthen our knowledge about it. Thanks Pulplo, that seems to be the consensus. Well explain the maximum spans allowable for 210 joists and beams and all the variables that go into calculating a 210 span, including species, spacing, location, and more. At 16 centers, the spans are between 9-2 and more than 26. Even increasing the spacing of the larger joists will still create a stronger joist structure than smaller lumber that is closer together. 2 grade. Per gallon) add that total together then take the average weight of 4 people and add to the hot tub total to get your load that you are needing to support. How much weight can a 3/4" x 8" lag bolt hold when drilled in half way? No 210 is structurally sound unless it has a decent foundation. Your beam can hold 3200 pounds. If you are using standard 24 studs, then youll only be able to have a double header. So, one spanning 16 should be able to cantilever 4. A 210 beam, joist, or rafter is merely a part of a larger picture. Although excellent for structural use, due to its coloring and appearance, it is also used for millwork and molding. A triple #2 - 210 beam of Southern pine can span between 7'-6" and 13'-0" with a live load of 40PSF depending on the joist span. capa have a triple 2x10 beam. Location. Load due to the weight of a mass - m - is mg Newton's - where g = 9.81 m/s2. Joist Spans. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Half way down the 16' wall I would triple 2x12's again across the 18' direction and then using Simpson hangers set my 2x12 . Southern yellow pine is strongest species of wood that can span more distance compared to other species of wood. View Joist & Rafter Tables Headers & Beams Anyone heard of extending 2x12 lumber spans by using . Turning an attic into a living space typically involves strengthening the floor, so the services of a Structural Engineer are recommended. For an uninhabited attic without storage, all SS, #1, and #2 2x10s of common species of construction timber can span 26 or more at 12 and 16 centers, except for #2 Southern pine which maxes at 25-7 at 16 centers. I recently had some plumbing work done, and while in the crawlspace of my house, the plumber told me that basically EVERY joist was rotten to the point where he could pull a screw out without unscrewing it. Most posts in home construction are either 4"x 4" or two 2"x 4"studs put together to make a 4"x 4". To connect the boards together, use a combination of construction adhesive and screws or nails, spiral nails are preferred. How to Remove Scratches From Laminate Floor. How far can a triple 26 beam span:- as per general rules and guidelines, #2 grade southern pine of a triple 26 deck beam can span upto 8 feet when total load of 50 psf (40 psf live load + 10 psf dead load) with deflection limit L/360. Learn more about door header sizes by checking out our door header size calculator. Can I sandwich 2 12 ft long ones with the seam being almost half way over the middle 11ft span? How to calculate beam load capacity using this beam load calculator. how much weight can a 2x10 support horizontally how much weight can a 2x10 support horizontally. What we need is basic information on what material we can use and how long a span it can be used for, without any support. The important grading for construction use is stress test grading. A good starting point is to find out the weight of the hot tub and the capacity of water it holds (water is 8.34 lb. . You can then select 210 or another size of lumber and set the load minimums for your desired framing piece. Free Span: typically, another term for span, it is the free or unsupported space provided between the supports of a structural component. WeekendBuilds.com is a participant in the Amazon Services LLC Associates Program, Maximum Spans for Joists, Rafters and Beams Chart. The definition of a gallon is 10lb of water. Listed are 46 tables based on common loading conditions for floor joists, ceiling joists and rafters. 3 and Stud: 660 565 480 660 565 480 660 565 480 565. Below well go over specifically beams vs. joists and how far a 210 can span in each application, but it is critical to understand that not all 2x10s are created equal. How Far Can a Double 210 Span Without Support? The distance a double 210 can span without support depends on its species, grade, spacing on center, load parameters, wet or dry service condition, and its purpose. Beam Span Calculator. We call these reacting forces support reactions. M = WL/8, so solving for W we get W = 8M/L = 8*11409/14 = 6520 pounds, say 6.5 kip. Floor joists are typically a horizontal structural member that runs across an open space of building on supporting wall or studs. How much weight can a 9 foot tall 3.5" x 1/4" thick hollow square steel tube hold vertically when used as a column, Book about a good dark lord, think "not Sauron". A triple 26 are made when three 26 beam are nailed together, a triple 28 are made when three 28 beam are nailed together, a triple 210 are made when three 210 beam are nailed together and a triple 212 are made when three 212 beam are nailed together. Only way to decrease it to maximise the load and minimise the internal resistance R (O). A double-ply beam of the same species can hold 288 plf and a triple-ply can hold 488 plf. A "span options" calculator allows selection of multiple species and grades for comparison purposes. I wonder if I need 3.5x11.75 or if I could go smaller because its a composite beam. I wish you good luck planning and constructing your next project with 210 lumber. The idea is that supporting columns or posts would need to be installed with that frequency, so as to ensure that the beams have sufficient support. How to calculate support reactions in a beam? A double-ply beam of the same species can hold 288 plf and a triple-ply can hold 488 plf. I need help in calculating the size of the beam that will support the rafters. capacity? If more loads are found at a closer distance to one support, that support-structure experiences more force and therefore experiences a greater reaction. Whether the attic space is uninhabited without storage or uninhabited with limited storage affects the span too. Understanding the plf of your beam is important, but span tables already take the plf of a beam into account and tell you the allowable span of your 210 beam depending on the width of the structure above it and other factors. 2 No. How to derive the state of a qubit after a partial measurement? Choosing a different grade and species usually results in shorter spans #2-Hem-Fir at 24 centers have span limits of 12-5, #2-SP 11-5, and a #2-SPF 12-7. This means that no joists or walls are bearing on the beam at all. The shorter the joist span, the greater the beam span allowable. View our Privacy Policy here. The ultimate resource for plywood. I am having 3 6x6 posts spaced 10' apart. It is relatively easy to produce, and a few manufacturers in the U.S. keep the price relatively low for engineered lumber. By code I will need a triple 2x10. That is to say, from face of support to face of support. The maximum limitation allowed is calculated by taking the span and dividing it by 360, with a maximum allowable deflection of 20mm. In fact, each 2x10 will support 1,200 lbs. Show Less. As mentioned earlier, it is normal to use the same sized lumber for the beams as for the joists. Truss chord cross-grain tension may limit allowable loads in accordance with ANSI/TPI 1-2014. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Joists and rafter spans for common loading conditions can be determined. In a typical floor, built over a crawlspace, there would be beams around the perimeter, as well as down the center of the floor, allowing the joists to attach to the beams at the edges and the middle. A double-ply beam of the same species can hold 288 plf and a triple-ply can hold 488 plf. Here's a. Of the two, posts are much more easily understood, as they only have to be able to support a certain amount of weight. Maybe a "current state" and "future state". The latter is 1,150 pounds per square inch. The bean is multi-spanned, as is the floor being supported. FWIW the weight of water changes a bit based on the temperature. In general, a triple 2x12s beam may normally span up to 14 feet with uniformly distributed loads. Joists are technically beams that typically spans relatively short distances compared to beams and are made of wood, steel, or engineered wood or lumber. Set them at 16 inches on center distances from each other and about 1-2" in from the edge of the board.Check out this video for more information: Join in and write your own page! Lvl is an excellent choice in lumber for quality home building due to its strength and straightness. Bedroom floors typically are rated for live loads of 30PSF, living areas for 40PSF, unoccupied attics for 5PSF, and storage attics for 10PSF, while all also have a dead load of 10PSF or 20PSF to account for building materials. [CP_CALCULATED_FIELDS id="86] Understanding Loads on Beams There are two different types of loads. Use a 3-ply #2-SP 210 beam and the spans increase to 7-6 and 13-0 for the same joist spans, and 7-2 and 12-6 for a triple 210 #2-SPF beam. All you have to do is input the span of the beam, the magnitude of the point loads, and their distances from support A. Make sure that all of your deck hardware and fasteners are triple zinc galvanized or stainless steel so they are compatible with ACQ lumber. This phenomenon is called loading.Loading is inherent in any practical circuit available. A 210 beam is meant to hold up to 40 psf of live load and 10 psf of dead load, just like a joist. Off the house to the back yard they are 10' 6" from one another with a 2x8 deck framed on it 16' out, 16" O/C. It typically is used when identifying the free or unsupported distance of a beam, joist, slab, floor, header, or rafter between structural supports such as posts, walls, or beams. For instance, deck joists and beams have different load requirements than a balcony or living room floor. Multiply 64 by 50 (live load plus dead load) and you get 3200 pounds per square foot. It also shows the maximum that the beam can span for various numbers of such pieces of lumber built together (this is indicated by 3-ply, 4-ply and 5-ply). mance of flitch plate beams. Assuming that the triple 2x12s beam is made of #2 southern yellow . It should be noted that other species are also tested, weve chosen the four species identified in the IRC which are most commonly used in construction. The posts are 11' from the garage wall. However, most architects design homes to use the same size joists throughout or at least on every floor, simplifying the building process. A doubled 210 can span 5-11 and 3-7 for 12 or 36 building widths. A triple 210 header can span 7-5 and 4-6, while the 4-ply stretches to 8-6 and 5-3 respectively. Texas. At 24 spacing, the rafter spans range from 8-4 and 23-9 depending on all factors. Lumber Species. Also, please take note that in this example of how to find support reactions and in the beam load calculator, we assumed that the beam is weightless. About Us Which is it? check in table 602.3 for built up girders and beams - item 27 in the 2015 book. Copyright 2023 CivilSir Additionally, using them for a joist, rafter, or beam also affects the span. Grade of lumber can be No. as far as fasting schedule goes, many states use the IRC. The open end of this u-shape is the 18' dimension and is adjacent to the entry. 2. 210 floor joists can span up to 20. Care and planning must be used in determining where to make those splices, so that the beam will have the necessary strength. Know that nearly all roofs are spaced further than 12 apart either 16 or 24 o.c. Bedrooms and attics are the only areas of a house that require less capacity than a 40 psf live load they only require 30 psf or less. The cost differance. 2 or better. Our calculator is easy and simple to use. 03:06. So I am considering doubling or tripling the 2x8s and making the triple 2x10s a quad to support the load with blocking down the center. 210 floor joists are designed to hold a 40 pound per square foot (psf) live load, plus a 10 psf dead load. Works with evenly distributed loads only. AITC 26F-1-9E Floor Beams Live Load. Weight supported by a double or triple wood header on two 4" x 4" posts: Span. Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. In engineering, structural members such as beams and columns interact with each other at the points where they meet. In that case, you could span up to 15 for decks that are 4 wide and up to 10 for decks that are 8 wide. AITC SP-48a Roof Beams Snow Load. Beams should be supported by at least 1 in. So, if your span is 30 feet (or 360 inches) you would divide that by 20 to come to 18 feet. FULL SCREEN. If you're curious about how to calculate beam deflections, we have our beam deflection calculator you can check out, or our feature-packed wood beam span calculator for in-depth calculation on wood beam design. I have a large deck. So if your rafters are 24 apart, a 210 will span 19 5 for steeper pitched roofs and 18 2 for roofs that are not steep, or below a 4:12 slope. Double check yourself with these span charts. Span tables indicate distance maximums for floor joists, with distances indicating the maximum length a 210 can span while still able to hold a 40 psf live load. Longer is even better. For that, we use the deflection criteria provided by the 2012 International Building Code, stating that beams under a combination of dead load (permanent load) and live load (loads that can vary in time) should at most have an allowable deflection equal to the span of the beam divided by . They reach westward into Missouri and Texas and through many of the southeastern states. As per general rules and guidelines, 2 grade southern pine of a triple 26 deck beam can span upto 8 feet, (3) 2x10 can span 13 feet, (3) 2x8 can span 11 feet and (3) 2x12 can span 15 feet. The longer the floor joists that the beam is supporting, the shorter the distance between supports that the beam needs.

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