Answer
In fact, each 2×10 will support 1,200 lbs. To be clear, spans are measured as “clear spans”.
When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2×12 beam can span 12 feet; a (2) 2×10 can span 10 feet and so on.
If you have a beam of steel which has a basic permissible bending stress of about 23000 lbs per square inch, by the time you make allowances for the span and the lack of restraint, the actual bending stress that the beam can handle is down to about 6100 lbs per square inch under these conditions.
The type of load in question will also determine how much weight a 2×6 can hold on edge. For example, a 2×4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. On the other end, a 2×6 can support a V8 engine of between 600 – 700 lbs.
some of it gets pretty technical in nature, and mostly relates to pounds / square foot of loading. 2x6s are generally used for ceiling joists, esp since you said 24″ oc and reallllly short spans only (5 or 6 feet ). (5 or 6 feet ). Most floor loads would be a minimum of 2×8 @ 16″ oc and most preferbaly 2×10.
Max. Live Load 30 lbs/ft2 (1436 N/m2) Maximum Span (ft – in) (ft – in) Nominal Size (inches) (inches) Joist Spacing Center to Center (inches) (inches) Lumber Grade 2 x 10 12 20′ – 3″ 16 18′ – 5″ 24 15′ – 0″
In general terms, joists spaced 16 inches on centre can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. The larger the deck, the larger the joists.
14 feet
A triple 2×6 beam over a span of 10′ feet should be more than sufficient for normal deck loads.
Measure your total span between members and ensure that it is not greater than 60 feet. Design a beam width based on the fact that the typical width of an LVL beam is 1 3/4 inches. Design a beam depth based on the rule of thumb for estimating the depth of manufactured beams which is to divide the span by 20.
Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting. Divide by the number of beams which will be installed to get the loading per beam.
If there is no strong wind, a 2×4 measuring at least 8 feet can support at least 1,000 pounds vertically. Such calculations would hold if, for instance, the load is square. However, it is highly advisable not to push the 2×4 material up to its limit.
What I figured if the weight is distributed evenly is that each 4×4 post is supporting a max of about 420 pounds.
Depending on the length of wall, a 2×4 wall could support 20,000–30,000lbs. This wall would obviously contain a lot of studs, but that is still a tonne of weight.
In general, a 2×4 wooden beam can support the weight up to a tonne horizontally, and thus, a wooden beam of 4×4 can easily support double of the weight mentioned above horizontally.
In bending, a joist composed of two 2×6’s (true dimension 1.5 inches x 5.5 inches) are slightly stronger than a single 2×8 true dimensions 1.5 inches by 7.25 inches.
So the area between two 2×6, 6′ long, on 2′ intervals would have to be able to support 2x6x40=480 pounds of weight. Actually, slightly more since the formula is for 8′-6″ spans but it just gives you a little bit of extra load for just in case.
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