I have two pieces of 2x6 Douglas Fir #2 or better, each about 8 feet long. The ends of both pieces are smoothly drilled with a single 9/16" hole to accept a long 1/2" carriage bolt. The bolts go through the 6" way, they is 2 1/2" in from the end of the boards. The two boards are joined with metal plates on their short sides, using the bolts. My question is: what bearing strength or stress should I use when calculating the allowable tension (or compressive) load in this assembly? I guess while I'm asking questions, what would the tensile and compressive allowable stress be for the boards?
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