Given a double-reinforced rectangular cross-section with b = 400 mm, d = 750 mm, As = 4,024 mm2, and As′ = 3,018 mm2. Ca

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Given a double-reinforced rectangular cross-section with b = 400
mm, d = 750 mm, As = 4,024 mm2, and
As′ = 3,018 mm2. Calculate the following
using the allowable stress design method taking fck
= 24 MPa and fy = 350 MPa.
a. Secondary moment of cracked section
b. Resistance moment of section