The 6 X 12-in. timber beam has been strengthened by bolting to it the steel reinforcement shown. The modulus of elasticity for wood is 1.8 X 106 psi and for steel is 29 X 106 psi. Knowing that the beam is bent about a horizontal axis by a couple of moment M X 450 kip.in., determine the maximum stress in
(a) the wood,
(b) the steel.
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