Question

Q-l.a As a fresh graduate, you have to design a vertical support assembly consisting of two bars AB and BC welded together at B. The bar has a fixed support at the top point A. The end C is acted upon by a vertically upward force of 30 kN and the joint B is acted upon by two vertically upward forces of 15 kN each. The weight of the bar AB is 60 kN and its failure stress is 50 MPa The weight of the bar BC is 40 kN and its failure stress is 80 MPa Both bars are 5 cm thick. The length of both segments is 30 cm. Find out smallest allowable widths hi and h of the segments AB and BC respectively for a factor of safety of 2. Make a neat sketch of the bar showing all dimensions and loads acting on them and label it according to the statement of the question. Draw the axial force diagram as well. (5 pts)

Answer 1

30cm) Go kN 30 kN 60 kN 0 kN Aec Compu tsionin fe (m) 60 x io κ 300-- "- ABc E lon ABC AB Total de3 mai in 00060 460 Total dtmali n Be BC. вс.

bans Stusbes in a AB hex 300 AB x10 PAe АВС. AB BC ABC AAB Given t,-t-5cm=50mm 110 40 50 x B Smallest possible and,々efn6QBc ale 60 A 60knJ 30