5. A symmetric I-section of size 180 mm x 40 mm, 8 mm thick is strengthened with 240 mm x 10 mm rectangular plate on top flange as shown is Fig. below. If permissible stress in the material is 150 N/mm?, determine how much concentrated load the beam of this section can carry at centre of 4 m span. Given ends of beam are simply supported. 240 mm 10 mm 8 mm thick 400 mm 180 mm