(0, 0)
253 mm
133 mm
30 mm
Question 5 (30 marks):
A W200×21 steel beam has a 133 mm × 30 mm steel plate welded to its top flange.

The depth of the beam is 253 mm, the cross-sectional area of the beam is 2710 mm2, and the moment of inertia of the beam about its centroidal x-axis is 19.8 × 106 mm4.

Find ybar, the y-coordinate of the centroidal x-axis of the composite area relative to the origin.

Find ICx, the moment of inertia of the composite area about its centroidal x-axis.

ybar =
ICx =
x 106 mm4