A three- member frame ABCD is loaded with ultimate gravity and lateral loads as shown in the figure. The compressive strength of concrete= 21 MPa, fy = 415 MPa, beam width= 300 mm, beam height = 600 mm, main bar diameter 28 mm, concrete cover = 40mm, and stirrups diameter = 10mm. Calculate the area of tension As2 to balance the compression in the steel in mm²