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13 Composite Beams Solution SITUATION (1-4): The composite beam is made of steel (A) bonded to brass (B) and has the cross section shown. If it is subjected to a moment of M = 6.5 kN-m, Ebr = 100 GPa Est = 200 GPa Solving for modular ratio: n = Est Ebr = 200 100 n = 2 Solving for transformed width (steel to brass): Recall: Only the width can be transformed. Height of section must remain constant to maintain the same strain diagram. b = 2(175mm) = 350 mm Transformed section:
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