The compound wooden beam is connected together by a boll at B. Assuming that the connections at A, B, C, and D exert only vertical forces on the beam, determine the required diameter of the bolt at B and the required outer diameter of its washers if the allowable lensile stress for the bolt is (σt)allow = 150 MPa and the allowable bearing stress for the wood is (σb)allow = 28 MPa. Assume that the hole in the washers has the same diameter as the boll.
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