Question 1 Part C Figure 4 shows a pin jointed truss The tru

Question 1 (Part C)

Figure 4 shows a pin jointed truss. The truss carries loads at A and B. All members are equal angles L76 x 76 x 9.5mm and are made from structural steel. Refer to the textbook ‘Riley, WF, Sturges, LD & Morris, DH 2007, Mechanics of Materials, 6th Edn, John Wiley & Sons, Brisbane’ appendixes for the cross section details and structural steel properties. Ignoring the mass of the truss members

c) Explain in a sentence or two: why sometimes in the analysis of pin jointed trusses the mass of the members are ignored?

1.2m 2.4m |2.4m 8 40kN 60kN 20.00 B77 Drawing not to scale

Solution

The mass of the members ignored sometimes because the mass of the members is smaller than the force in the members.