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Extracted text: 7. From the cross section given adjacent, if fb, max is limited to 20 MPa, how much moment can the beam section carry? 200 ANSWERS 700 dia = 50 y = 432 mm from base; Ix = 22.08 x 10° mm4 150 Using fb = (M/I)y where fb = 20 N/mm?, y = (1000-432) mm, Ix = 22.08 x 10° mm4 100 150 400 yields M = 778 kNm. CROSS - SECTION