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Determine the factored moment capacity ∅Mn of the rectangular section subjected to interior environmental exposure with an initial deformation in the concrete substrate εbi = 0.0060.

The material and geometric data of the section are: concrete, f'c = 20.68 MP a, width b = 300 mm, height h = 600 mm, reinforcement depth d = 560 mm; steel reinforcement: As = 602 mm2, fy = 413 MP a; FRP,  f'fu = 2800 MP a,  ε'fu= 0.017, Ef = 164000 MP a,bf = 250 mm, tf = 0.333 mm, n = 1.

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