The joint between the two 2x6's fastened vertically edge-to-edge is very much in shear because it is on the neutral axis. "Neutral axis" only means no tension or compression, not the absence of any stresses. The beam only acts like a solid 2x12 if the two individual 2x6's are prevented from moving relative to each other and this depends completely on the shear strength of the joint. Think of what happens to a soft-cover book when it is bent - the pages slip against each other and become offset and the two-element beam will try to do the same thing.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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