Question

A 500mm width square tied column with reinforcement on four faceshas a gross steel ratio is...

A 500mm width square tied column with reinforcement on four faceshas a gross steel ratio is 0.02 and the concrete cover from the column surface to the steel centroid is 100 mm.
what is the nominal axial capacity of the column if subjected to biaxial bending where ex=ey=250 mm? use fy'=21 Mpa and fy= 415 Mpa, reciprocal load method and interaction diagram below.

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