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Theory of Structures - Engineering

Q1:

A steel plate d x b is sandwiched rigidly between two timber joists each D x B/2 in section. The moment of resistance of the beam for the same maximum permissible stress σ in timber and steel will be (where Young's modulus of steel is m times that of the timber).

A

B

C

D

ANS:B -

Please any explain it.