Two rolled steel angles (Ix1, = 391 × 103 mm4, Iy1 = 912 × 103 mm4, Ix1y1 = 349 × 103 mm4,...

Two rolled steel angles (Ix1, = 391 × 103 mm4, Iy1 = 912 × 103 mm4, Ix1y1 = 349 × 103 mm4, and A = 1148 mm2) are welded to a 200 mm by 10 mm steel plate to form a composite Z-bar (Figure P7.26). The Z-bar is a simply supported beam used as a purlin in a root of slope . The beam has a span of 4.00 m. The yield stress of the steel in the plate and angles isY = 300 MPa. The beam has been designed using a factor of safety of SF = 2.50 against initiation of yielding, If the plane of the loads is vertical, determine the magnitude of the maximum distributed load that can be applied to the beam.

FIGURE P7.26