Question

Fig. P5. metric rolled-steel channels are to be welded back to back and 5,40 the loading shown. Knowing that the allowable normal stress o support d is 200 MPa, determine the most economical channels that Two metri MPa, r the steel used can be used. 80 kN 30 kN/m 1.8 m 0.9 m 3.6 m Fig. P5.40 5.38 and 5.39 Knowing that the allowable stress for the steel used is 165 MPa, select the most economical S-shape beam to support the loading shown. Problems 5.3 161 200 kN 200 kN 200 kN 160 kN/m s0 kN 8o kN 06 m 06m 06 m 06m Fig. P5.38 06 m 0.6m Fig. P5.39 06 m 5.40 Two metric rolled-steel channels are to be welded back to back and used to support the loading shown. Knowing that the allowable normal stress for the steel used is 200 MPa, determine the most economical channels that can be used. So kN 30 kN/m 20 kN 20kN 20 kN 18 m 0.9m @0.675 m -2.7m 3.6m Fig. P5.41 Fig. P5.40

Answer 1

ZoILNN 30 RNIm 3.6 m2 A 73-SKN 73- S At 6o 66 IS Αβ C to D

mD 60.30-60.32、 min - 330.75 Xo6m 13 3 Shaupe l73 930%/9.9 C 200 X27.9 | 179 C. 230X19.9