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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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