Posted by ChrisLSD on November 09, 2009 at 06:11:02 from (97.114.246.194):
In Reply to: Engineered Beams posted by tlak on November 08, 2009 at 11:26:35:
to answer your question..... if the board and the engineered beam are made out of the same material (pine, fir) so they compress about the same, there load carrying capacity is the same......HOWEVER the reason modern day uses engineered beams is because if there is a structural defect in the wrong place on the lumber (let's say a knot goes from the edge in 1" on the lumber) then the lumer is only acting like an 11 board instead of a 12" board - which may not sound like a lot - but a 2X6 is 3.5 times stronger than a 2x4 on edge..... that is also why real truss manufacturing places among others use specially graded lumber which reduce these type of defects.....again depends on what kind of loading is going to happen also..... next question.... would 2 1.5" beams be twice as strong as one and be the same as a 3" beam.... basic answer is yes AS LONG AS it acts like one piece.....for example if you take 2 skinny members, place them side by side, and start loading them, if they start to seperate or lean as the load is applied then they are not acting as one unit, and will fail before the loading of the single unit that was twice as big BUT if the two skinny beams are attached together and act as one unit, then, yes they will be as strong as a single unit which is twice as thick......
Another example....place a playing card like a bridge, supported on each end.....pressing down in the middle will act as the load.....if you use more cards it will hold more load, BUT if you take a whole deck of cards and place them on this made up bridge you can still press down in the middle and make the whole deck of cards curve or deflect downward, because they are not acting like one unit.....now take that deck of cards and glue each card to the one below it so when you are done the whole deck of cards is glued together, now place that glued up deck of ards on the supprots and press in the middle - it will hold WAY more load before a significant bending or failure will occur because all the cards are acting as a single unit
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