In canada and america this type beams are often used. In the Netherlands apparently not. I made hol

In canada and america this type beams are often used. In the Netherlands apparently not. I made hollow beams for a porch. Hollow because commercials had to be built and the size of the beam should be limited. The beams are made of a 2x3 beam given for firing 18 mm wbp Uniprime. This all is fully glued with water resistant wood glue (no glue effervescent) and every 10 cm around fixed put 5 cm long staple. Length of the beams is 320 cm. The roof is finished with 16mm multiwall polycarbonate sheets. Coincidentally, I talked to a builder about this construction table base which told me that this structure was not strong enough. Hazardous he even found it. To my question he like ff quickly calculated that he could not answer. table base I walked on the roof (105 kilo clean on the hook) and the beams feathers somewhat but no creaking or whatever. My question is how to make a calculation on the strength of such beams in comparison with a wooden beam
It's table base what's tricky. Well known is the computation of a beam, which is well able to bear a certain weight, although the beam or bends. Now the same beam is provided with reinforcements and put the same weight. Result: the beam breaks ... This happened sometimes with barges, the bottom was replaced by a thicker bottom. It mainly has to do the shifting of the neutral axis, so that the voltage at the extreme fiber becomes too large. To calculate the exact strength of a beam Be it construction, you have the dimensions, and the required bending strength. On the Internet there is to be found on a layout. Incidentally, not all from the USA is sacred. They still believe that a roof with 20 nails can be put firmly, and then remains if a hurricane blows over ... Nota bene a Dutchman has invented a "hurricane table base clamp" decent roof beams which fasten. (With the use of nails 2, ...)
There is a difference between a box beams which will be used constructively box beams and used for ornamental work. A good constructive box beam is made of 2 bars and 2 sides of plywood or 4 sides of plywood. A structural box beam is not purely made in absentia, mitres are in fact connections to slide apart if tax comes. In view of work is always in absentia therefore a tongue and groove construction gemaakt.Ook should be in the box beam stiffeners to the 50 cm that surround the glued outer parts and take down. I would say that in your case you should consider only the sides as supporting part, so in fact you have "bars" of 18 to 100 coupled with a firing liggertje. As I see here the firing bar only hanging between, it has no bearings and no load-bearing function. Does ensure the fire wood for some stability. Because there plywood is used, there must be counted with other strengths than with spruce. What these values for plywood processed on the side, I do not know. Practically; if you can just walk over it will not collapse over it ... Please only briefly with possible snow loads. Has all been through once all 4 seasons? I make plywood outside woodwork because never in default (at least not with warranty) because the chances are that the temperature and humidity changes throughout the year, the mitres will open (with plywood that can of course be less than solid wood) . Have the cutting edges (also cut mitres) of Uniprime be treated with edge sealer to prevent moisture can draw ?? RvdB Klusser Master Posts: 354 Joined: Fri Jan 25, 2008 12:05 pm
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