The compound wooden beam is connected together by a bolt 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 tensile 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 bolt.
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