A simple pin-connected truss is loaded and supported as shown in Figure P1.12. The load P is 200 kN. All members of the truss are aluminum pipes that have an outside diameter of 115 mm and a wall thickness of 6 mm. Determine the normal stress in each truss member. Assume truss dimensions of a = 12.0 m, b = 7.5 m, and c = 6.0 m.

The center post B of the assembly has an original length of 124.7 mm, whereas posts A and C have a length of 125 mm. If the caps on the top and bottom can be considered rigid, determine the average normal stress in each post. The posts are made of aluminum and have a cross-sectional area of 400 mm Eal = 70 GPa. |800 kN/m +100 mm -100 mm A B 125 mm I800 kN/m Answer: 0A = 0c = 189 MPa, oB 21.4 MPа

Required information Consider the beam and loading shown. If a=8 in, b=9.0 in, c=1 in. For a section at n-n, determine the shear stress at b. A 25 kips 20 in.- 10 in. 25 kips - 20 in.- B a +6 i in.. in. b b a с in.

Problem 2. [Concepts: Internal forces in 2D and average normal stress] The bars of the truss each have a cross-sectional area of 1.25 in². a) Determine the average normal stress in each member due to the loading P = 8 kip. State whether the stress is tensile or compressive. b) If the maximum average normal stress in any bar is not to exceed 20 ksi, determine the maximum magnitude P of the loads that can be applied to the truss. 4 ft 4 ft 4 E 0.75 P 0